bsc/BSC_Tests.ttcn

module BSC_Tests {

/* Integration Tests for OsmoBSC
 * (C) 2017-2018 by Harald Welte <laforge@gnumonks.org>
 * All rights reserved.
 *
 * Released under the terms of GNU General Public License, Version 2 or
 * (at your option) any later version.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * This test suite tests OsmoBSC while emulating both multiple BTS + MS as
 * well as the MSC. See README for more details.
 *
 * There are test cases that run in so-called 'handler mode' and test cases
 * that run directly on top of the BSSAP and RSL CodecPorts.  The "handler mode"
 * tests abstract the multiplexing/demultiplexing of multiple SCCP connections
 * and/or RSL channels and are hence suitable for higher-level test cases, while
 * the "raw" tests directly on top of the CodecPorts are more suitable for lower-
 * level testing.
 */

import from Misc_Helpers all;
import from General_Types all;
import from Osmocom_Types all;
import from GSM_Types all;
import from IPL4asp_Types all;

import from BSSAP_Types all;
import from RAN_Adapter all;
import from BSSAP_LE_Adapter all;
import from BSSAP_LE_CodecPort all;
import from BSSAP_LE_Types all;
import from BSSLAP_Types all;
import from BSSAP_CodecPort all;
import from BSSMAP_Templates all;
import from IPA_Emulation all;
import from IPA_CodecPort all;
import from IPA_Types all;
import from IPA_Testing all;
import from RSL_Types all;
import from RSL_Emulation all;
import from MGCP_Emulation all;
import from MGCP_Templates all;
import from MGCP_Types all;
import from MGCP_CodecPort all;

import from Osmocom_CTRL_Functions all;
import from Osmocom_CTRL_Types all;
import from Osmocom_CTRL_Adapter all;

import from StatsD_Types all;
import from StatsD_CodecPort all;
import from StatsD_CodecPort_CtrlFunct all;
import from StatsD_Checker all;

import from Osmocom_VTY_Functions all;
import from TELNETasp_PortType all;

import from MobileL3_CommonIE_Types all;
import from MobileL3_Types all;
import from MobileL3_RRM_Types all;
import from L3_Templates all;
import from GSM_RR_Types all;

import from SCCP_Templates all;
import from BSSMAP_Templates all;
import from BSSMAP_LE_Templates all;

import from SCCPasp_Types all;

import from GSM_SystemInformation all;
import from GSM_RestOctets all;
import from TCCConversion_Functions all;

const integer NUM_BTS := 3;
const integer NUM_MSC := 3;
const float T3101_MAX := 12.0;

/* make sure to sync this with the osmo-bts.cfg you're using */
const integer NUM_TCHH_PER_BTS := 2;
const integer NUM_TCHF_PER_BTS := 4;
const integer NUM_SDCCH_PER_BTS := 3;


/* per-BTS state which we keep */
type record BTS_State {
	/* component reference to the IPA_Client component used for RSL */
	IPA_Client rsl
}

/* Default list of counters for an 'msc' entity. */
const CounterNameVals counternames_msc_mscpool := {
	{ "mscpool:subscr:new", 0 },
	{ "mscpool:subscr:known", 0 },
	{ "mscpool:subscr:reattach", 0 },
	{ "mscpool:subscr:attach_lost", 0 },
	{ "mscpool:subscr:paged", 0 }
};

/* Default list of counters for 'bsc' and 'bts' entities. */
const CounterNameVals counternames_bsc_bts_handover := {
	{ "assignment:attempted", 0 },
	{ "assignment:completed", 0 },
	{ "assignment:stopped", 0 },
	{ "assignment:no_channel", 0 },
	{ "assignment:timeout", 0 },
	{ "assignment:failed", 0 },
	{ "assignment:error", 0 },

	{ "handover:attempted", 0 },
	{ "handover:completed", 0 },
	{ "handover:stopped", 0 },
	{ "handover:no_channel", 0 },
	{ "handover:timeout", 0 },
	{ "handover:failed", 0 },
	{ "handover:error", 0 },

	{ "intra_cell_ho:attempted", 0 },
	{ "intra_cell_ho:completed", 0 },
	{ "intra_cell_ho:stopped", 0 },
	{ "intra_cell_ho:no_channel", 0 },
	{ "intra_cell_ho:timeout", 0 },
	{ "intra_cell_ho:failed", 0 },
	{ "intra_cell_ho:error", 0 },

	{ "intra_bsc_ho:attempted", 0 },
	{ "intra_bsc_ho:completed", 0 },
	{ "intra_bsc_ho:stopped", 0 },
	{ "intra_bsc_ho:no_channel", 0 },
	{ "intra_bsc_ho:timeout", 0 },
	{ "intra_bsc_ho:failed", 0 },
	{ "intra_bsc_ho:error", 0 },

	{ "interbsc_ho_out:attempted", 0 },
	{ "interbsc_ho_out:completed", 0 },
	{ "interbsc_ho_out:stopped", 0 },
	{ "interbsc_ho_out:timeout", 0 },
	{ "interbsc_ho_out:failed", 0 },
	{ "interbsc_ho_out:error", 0 },

	{ "interbsc_ho_in:attempted", 0 },
	{ "interbsc_ho_in:completed", 0 },
	{ "interbsc_ho_in:stopped", 0 },
	{ "interbsc_ho_in:no_channel", 0 },
	{ "interbsc_ho_in:timeout", 0 },
	{ "interbsc_ho_in:failed", 0 },
	{ "interbsc_ho_in:error", 0 }
};

/* Set of all System Information received during one RSL port's startup.
 * Note that some System Information may be sent on RSL, but lacking actual SI data, to indicate that the BTS should not
 * broadcast that SI type. That will be reflected as 'omit' here.
 */
type record SystemInformationConfig {
	SystemInformationType1 si1 optional,
	SystemInformationType2 si2 optional,
	SystemInformationType2bis si2bis optional,
	SystemInformationType2ter si2ter optional,
	SI2quaterRestOctetsList si2quater optional,
	SystemInformationType3 si3 optional,
	SystemInformationType4 si4 optional,
	/* TODO: replace with proper decoding of SI13, implement SI13 in GSM_SystemInformation.ttcn */
	octetstring si13 optional,
	SystemInformationType5 si5 optional,
	SystemInformationType5bis si5bis optional,
	SystemInformationType5ter si5ter optional,
	SystemInformationType6 si6 optional
};

const SystemInformationConfig SystemInformationConfig_omit := {
	si1 := omit,
	si2 := omit,
	si2bis := omit,
	si2ter := omit,
	si2quater := omit,
	si3 := omit,
	si4 := omit,
	si13 := omit,
	si5 := omit,
	si5bis := omit,
	si5ter := omit,
	si6 := omit
};

/* tr_EUTRAN_CellDesc with defaults used in BSC_Tests.ttcn */
template EUTRAN_CellDesc tr_EUTRAN_CellDesc_default(template (present) uint16_t e_arfcn := ?,
						    template uint3_t meas_bw := 3)
:= tr_EUTRAN_CellDesc(e_arfcn := e_arfcn,
		      meas_bw_presence := '1'B,
		      meas_bw := meas_bw);

/* tr_EUTRAN_NeighbourCells with defaults used in BSC_Tests.ttcn */
template EUTRAN_NeighbourCells tr_EUTRAN_NeighbourCells_default(template (present) EUTRAN_CellDescs cell_desc_list := { tr_EUTRAN_CellDesc_default },
								template uint3_t prio := 3,
								template (present) uint5_t thresh_high := 20,
								template uint5_t thresh_low := 10,
								template uint5_t qrxlevmin := 22)
:= tr_EUTRAN_NeighbourCells(
	cell_desc_list := cell_desc_list,
	prio_presence := '1'B,
	prio := prio,
	thresh_high := thresh_high,
	thresh_low_presence := '1'B,
	thresh_low := thresh_low,
	qrxlevmin_presence := '1'B,
	qrxlevmin := qrxlevmin);

template SystemInformationConfig SystemInformationConfig_default := {
	si1 := {
	    cell_chan_desc := '8FB38000000000000000000000000000'O,
	    rach_control := {
		max_retrans := RACH_MAX_RETRANS_7,
		tx_integer := '1001'B,
		cell_barr_access := false,
		re_not_allowed := true,
		acc := '0000010000000000'B
	    },
	    rest_octets := ?
	},
	si2 := {
	    bcch_freq_list := '00000000000000000000000000000000'O,
	    ncc_permitted := '11111111'B,
	    rach_control := {
		max_retrans := RACH_MAX_RETRANS_7,
		tx_integer := '1001'B,
		cell_barr_access := false,
		re_not_allowed := true,
		acc := '0000010000000000'B
	    }
	},
	si2bis := omit,
	si2ter := {
	    extd_bcch_freq_list := '8E320000000000000000000000000800'O,
	    rest_octets := ?
	},
	si2quater := {
		tr_SI2quaterRestOctets_EUTRAN( repeated_neigh_cells := { tr_EUTRAN_NeighbourCells_default } )
	},
	si3 := {
	    cell_id := 0,
	    lai := {
		mcc_mnc := '001F01'H,
		lac := 1
	    },
	    ctrl_chan_desc := {
		msc_r99 := true,
		att := true,
		bs_ag_blks_res := 1,
		ccch_conf := CCHAN_DESC_1CCCH_COMBINED,
		si22ind := false,
		cbq3 := CBQ3_IU_MODE_NOT_SUPPORTED,
		spare := '00'B,
		bs_pa_mfrms := 3,
		t3212 := 30
	    },
	    cell_options := {
		dn_ind := false,
		pwrc := false,
		dtx := MS_SHALL_USE_UL_DTX,
		radio_link_tout_div4 := 7
	    },
	    cell_sel_par := {
		cell_resel_hyst_2dB := 2,
		ms_txpwr_max_cch := 7,
		acs := '0'B,
		neci := true,
		rxlev_access_min := 0
	    },
	    rach_control := {
		max_retrans := RACH_MAX_RETRANS_7,
		tx_integer := '1001'B,
		cell_barr_access := false,
		re_not_allowed := true,
		acc := '0000010000000000'B
	    },
	    rest_octets := {
		sel_params := {
		    presence := '0'B,
		    params := omit
		},
		pwr_offset := {
		    presence := '0'B,
		    offset := omit
		},
		si_2ter_ind := '1'B,
		early_cm_ind := '0'B,
		sched_where := {
		    presence := '0'B,
		    where := omit
		},
		gprs_ind := {
		    presence := '1'B,
		    ind := {
			ra_colour := 0,
			si13_pos := '0'B
		    }
		},
		umts_early_cm_ind := '1'B,
		si2_quater_ind := {
		    presence := '1'B,
		    ind := '0'B
		},
		iu_mode_ind := omit,
		si21_ind := {
		    presence := '0'B,
		    pos := omit
		}
	    }
	},
	si4 := {
	    lai := {
		mcc_mnc := '001F01'H,
		lac := 1
	    },
	    cell_sel_par := {
		cell_resel_hyst_2dB := 2,
		ms_txpwr_max_cch := 7,
		acs := '0'B,
		neci := true,
		rxlev_access_min := 0
	    },
	    rach_control := {
		max_retrans := RACH_MAX_RETRANS_7,
		tx_integer := '1001'B,
		cell_barr_access := false,
		re_not_allowed := true,
		acc := '0000010000000000'B
	    },
	    cbch_chan_desc := {
		iei := '64'O,
		v := {
		    chan_nr := {
			u := {
			sdcch4 := {
			    tag := '001'B,
			    sub_chan := 2
			}
			},
			tn := 0
		    },
		    tsc := 2,
		    h := false,
		    arfcn := 871,
		    maio_hsn := omit
		}
	    },
	    cbch_mobile_alloc := omit,
	    rest_octets := {
		sel_params := {
		    presence := '0'B,
		    params := omit
		},
		pwr_offset := {
		    presence := '0'B,
		    offset := omit
		},
		gprs_ind := {
		    presence := '1'B,
		    ind := {
			ra_colour := 0,
			si13_pos := '0'B
		    }
		},
		s_presence := '0'B,
		s := omit
	    }
	},
	si13 := '9000185A6FC9E08410AB2B2B2B2B2B2B2B2B2B2B'O,
	si5 := {
	    bcch_freq_list := '10000000000000000000000000000000'O
	},
	si5bis := omit,
	si5ter := {
	    extd_bcch_freq_list := '9E050020000000000000000000000000'O
	},
	si6 := {
	    cell_id := 0,
	    lai := {
		mcc_mnc := '001F01'H,
		lac := 1
	    },
	    cell_options := {
		dtx_ext := '1'B,
		pwrc := false,
		dtx := '01'B,
		radio_link_timeout := '0111'B
	    },
	    ncc_permitted := '11111111'B,
	    rest_octets := ?
	}
    };


/* List of all the System Information received on all RSL ports */
type record of SystemInformationConfig SystemInformationConfig_list;

function f_sysinfo_dec_raw(inout SystemInformationConfig si, RSL_Message rsl)
{
	var RSL_IE_Body sysinfo_type_ie;
	var RSL_IE_SysinfoType si_type;
	var octetstring data;

	if (f_rsl_find_ie(rsl, RSL_IE_SYSINFO_TYPE, sysinfo_type_ie) == false) {
		setverdict(fail, "Cannot find RSL_IE_SYSINFO_TYPE");
		mtc.stop;
	}
	si_type := sysinfo_type_ie.sysinfo_type;

	if (rsl.msg_type == RSL_MT_BCCH_INFO) {
		var RSL_IE_Body bcch_ie;
		if (f_rsl_find_ie(rsl, RSL_IE_FULL_BCCH_INFO, bcch_ie)) {
			data := bcch_ie.other.payload;
		}
	} else if (rsl.msg_type == RSL_MT_SACCH_FILL) {
		var RSL_IE_Body l3_ie;
		if (f_rsl_find_ie(rsl, RSL_IE_L3_INFO, l3_ie)) {
			data := l3_ie.l3_info.payload;
		}
	} else {
		setverdict(fail, "Don't understand this System Information message");
		mtc.stop;
	}

	var boolean handled := false;

	if (rsl.msg_type == RSL_MT_BCCH_INFO) {
		handled := true;

		if (si_type == RSL_SYSTEM_INFO_1) {
			if (not isbound(data)) {
				si.si1 := omit;
			} else {
				si.si1 := dec_SystemInformation(data).payload.si1;
			}
		} else if (si_type == RSL_SYSTEM_INFO_2) {
			if (not isbound(data)) {
				si.si2 := omit;
			} else {
				si.si2 := dec_SystemInformation(data).payload.si2;
			}
		} else if (si_type == RSL_SYSTEM_INFO_2bis) {
			if (not isbound(data)) {
				si.si2bis := omit;
			} else {
				si.si2bis := dec_SystemInformation(data).payload.si2bis;
			}
		} else if (si_type == RSL_SYSTEM_INFO_2ter) {
			if (not isbound(data)) {
				si.si2ter := omit;
			} else {
				si.si2ter := dec_SystemInformation(data).payload.si2ter;
			}
		} else if (si_type == RSL_SYSTEM_INFO_2quater) {
			if (not isbound(data)) {
				si.si2quater := {};
			} else {
				var SystemInformationType2quater decoded := dec_SystemInformation(data).payload.si2quater;
				/* this is a *record* of SI2quaterRestOctets! (multiplexed) */
				si.si2quater[decoded.rest_octets.si2quater_index] := decoded.rest_octets;
			}
		} else if (si_type == RSL_SYSTEM_INFO_3) {
			if (not isbound(data)) {
				si.si3 := omit;
			} else {
				si.si3 := dec_SystemInformation(data).payload.si3;
			}
		} else if (si_type == RSL_SYSTEM_INFO_4) {
			if (not isbound(data)) {
				si.si4 := omit;
			} else {
				si.si4 := dec_SystemInformation(data).payload.si4;
			}
		} else if (si_type == RSL_SYSTEM_INFO_13) {
			if (not isbound(data)) {
				si.si13 := omit;
			} else {
				si.si13 := dec_SystemInformation(data).payload.other;
			}
		} else {
			handled := false;
		}
	} else if (rsl.msg_type == RSL_MT_SACCH_FILL) {
		handled := true;

		if (si_type == RSL_SYSTEM_INFO_5) {
			if (not isbound(data)) {
				si.si5 := omit;
			} else {
				si.si5 := dec_SystemInformation(data).payload.si5;
			}
		} else if (si_type == RSL_SYSTEM_INFO_5bis) {
			if (not isbound(data)) {
				si.si5bis := omit;
			} else {
				si.si5bis := dec_SystemInformation(data).payload.si5bis;
			}
		} else if (si_type == RSL_SYSTEM_INFO_5ter) {
			if (not isbound(data)) {
				si.si5ter := omit;
			} else {
				si.si5ter := dec_SystemInformation(data).payload.si5ter;
			}
		} else if (si_type == RSL_SYSTEM_INFO_6) {
			if (not isbound(data)) {
				si.si6 := omit;
			} else {
				si.si6 := dec_SystemInformation(data).payload.si6;
			}
		} else {
			handled := false;
		}
	}

	if (not handled) {
		setverdict(fail, "Unexpected SI type in ", rsl.msg_type, " message: ", si_type);
	}
}

type component test_CT extends CTRL_Adapter_CT {
	/* Array of per-BTS state */
	var BTS_State bts[NUM_BTS];
	/* RSL common Channel Port (for RSL_Emulation) */
	port RSL_CCHAN_PT RSL_CCHAN[NUM_BTS];
	/* array of per-BTS RSL test ports */
	port IPA_RSL_PT IPA_RSL[NUM_BTS];
	port IPA_CODEC_PT IPA; /* Required for compilation of TC_rsl_unknown_unit_id() */
	/* CTRL muxed over IPA in SCCPlite conn BSC<->MSC (or BSC-NAT) */
	port IPA_CTRL_PT SCCPLITE_IPA_CTRL;

	var MGCP_Emulation_CT vc_MGCP;
	port TELNETasp_PT BSCVTY;

	/* StatsD */
	var StatsD_Checker_CT vc_STATSD;

	var RAN_Adapter g_bssap[NUM_MSC];
	var BSSAP_LE_Adapter g_bssap_le;
	/* for old legacy-tests only */
	port BSSAP_CODEC_PT BSSAP;
	port BSSAP_LE_CODEC_PT BSSAP_LE;

	/* are we initialized yet */
	var boolean g_initialized := false;

	/* Osmux is enabled through VTY */
	var boolean g_osmux_enabled := false;

	/*Configure T(tias) over VTY, seconds */
	var integer g_bsc_sccp_timer_ias :=  7 * 60;
	/*Configure T(tiar) over VTY, seconds */
	var integer g_bsc_sccp_timer_iar := 15 * 60;

	/* global test case guard timer (actual timeout value is set in f_init()) */
	timer T_guard := 30.0;

	var CounterNameValsList g_ctr_msc;
	var CounterNameValsList g_ctr_bsc;
	var CounterNameValsList g_ctr_bts;

	/* System Information bytes as received during RSL startup, for each RSL[idx]. */
	var SystemInformationConfig_list g_system_information := {};
}

modulepar {
	/* IP address at which the BSC can be reached */
	charstring mp_bsc_ip := "127.0.0.1";
	/* port number to which to establish the IPA OML connections */
	integer mp_bsc_oml_port := 3002;
	/* port number to which to establish the IPA RSL connections */
	integer mp_bsc_rsl_port := 3003;
	/* port number to which to establish the IPA CTRL connection */
	integer mp_bsc_ctrl_port := 4249;
	/* port number to which to listen for STATSD metrics */
	integer mp_bsc_statsd_port := 8125;
	/* IP address at which the test binds */
	charstring mp_test_ip := "127.0.0.1";

	RAN_Configurations mp_bssap_cfg := {
		{
			transport := BSSAP_TRANSPORT_AoIP,
			sccp_service_type := "mtp3_itu",
			sctp_addr := { 23905, "127.0.0.1", 2905, "127.0.0.1" },
			own_pc := 185,	/* 0.23.1 first MSC emulation */
			own_ssn := 254,
			peer_pc := 187, /* 0.23.3 osmo-bsc */
			peer_ssn := 254,
			sio := '83'O,
			rctx := 1
		},
		{
			transport := BSSAP_TRANSPORT_AoIP,
			sccp_service_type := "mtp3_itu",
			sctp_addr := { 23906, "127.0.0.1", 2905, "127.0.0.1" },
			own_pc := 2,	/* 0.0.2 second MSC emulation */
			own_ssn := 254,
			peer_pc := 187, /* 0.23.3 osmo-bsc */
			peer_ssn := 254,
			sio := '83'O,
			rctx := 2
		},
		{
			transport := BSSAP_TRANSPORT_AoIP,
			sccp_service_type := "mtp3_itu",
			sctp_addr := { 23907, "127.0.0.1", 2905, "127.0.0.1" },
			own_pc := 3,	/* 0.0.3 third MSC emulation */
			own_ssn := 254,
			peer_pc := 187, /* 0.23.3 osmo-bsc */
			peer_ssn := 254,
			sio := '83'O,
			rctx := 3
		}
	};

	BSSAP_LE_Configuration mp_bssap_le_cfg := {
		sccp_service_type := "mtp3_itu",
		sctp_addr := { 23908, "127.0.0.1", 2905, "127.0.0.1" },
		own_pc := 190,	/* 0.23.6 SMLC emulation */
		own_ssn := 252,	/* SMLC side SSN */
		peer_pc := 187, /* 0.23.3 osmo-bsc */
		peer_ssn := 250, /* BSC side SSN */
		sio := '83'O,
		rctx := 6
	};
	boolean mp_enable_lcs_tests := true;

	/* Whether to enable osmux tests. Can be dropped completely and enable
	   unconditionally once new version of osmo-bsc is released (current
	   version: 1.4.1) */
	boolean mp_enable_osmux_test := true;
	/* Value set in osmo-bsc.cfg "ms max power" */
	uint8_t mp_exp_ms_power_level := 7;

	boolean mp_media_mgw_offer_ipv6 := true;
}

private function f_gen_test_hdlr_pars(integer bssap_idx := 0) return TestHdlrParams {

	var TestHdlrParams pars := valueof(t_def_TestHdlrPars);
	if (mp_bssap_cfg[bssap_idx].transport == BSSAP_TRANSPORT_AoIP) {
		pars.aoip := true;
	} else {
		pars.aoip := false;
	}
	pars.exp_ms_power_level := mp_exp_ms_power_level;
	pars.mscpool.bssap_idx := bssap_idx;
	pars.media_mgw_offer_ipv6 := mp_media_mgw_offer_ipv6;

	return pars;
}

/* Convenience functions for rate counters using g_ctr_msc. */

private function f_ctrs_msc_init(integer mscs_count := NUM_MSC, CounterNameVals counternames := counternames_msc_mscpool) runs on test_CT {
	g_ctr_msc := f_counter_name_vals_get_n(IPA_CTRL, "msc", mscs_count, counternames);
	log("initial msc rate counters: ", g_ctr_msc);
}

private function f_ctrs_msc_add(integer msc_nr, charstring countername, integer val := 1) runs on test_CT {
	f_counter_name_vals_list_add(g_ctr_msc, msc_nr, countername, val);
}

/*  f_ctrs_msc_init();
 *  f_do_thing(on_msc := 0);
 *  f_do_thing(on_msc := 0);
 *  f_do_other(on_msc := 1);
 *  f_ctrs_msc_add(0, "thing", 2);
 *  f_ctrs_msc_add(1, "other");
 *  f_ctrs_msc_verify();
 */
private function f_ctrs_msc_verify() runs on test_CT {
	log("verifying msc rate counters: ", g_ctr_msc);
	f_counter_name_vals_expect_n(IPA_CTRL, "msc", g_ctr_msc);
}

/* convenience: f_ctrs_msc_add() and f_ctrs_msc_verify() in one call.
 *  f_ctrs_msc_init();
 *  f_do_thing(on_msc := 0);
 *  f_do_thing(on_msc := 0);
 *  f_do_thing(on_msc := 0);
 *  f_ctrs_msc_expect(0, "thing", 3);
 */
private function f_ctrs_msc_expect(integer msc_nr, charstring countername, integer val := 1) runs on test_CT {
	f_ctrs_msc_add(msc_nr, countername, val);
	f_ctrs_msc_verify();
}

/* Convenience functions for rate counters using g_ctr_bts, always also including g_ctr_bsc. */

private function f_ctrs_bsc_and_bts_init(integer bts_count := NUM_BTS, CounterNameVals counternames := counternames_bsc_bts_handover) runs on test_CT {
	g_ctr_bts := f_counter_name_vals_get_n(IPA_CTRL, "bts", bts_count, counternames);
	log("initial bts rate counters: ", g_ctr_bts);
	f_ctrs_bsc_init(counternames);
}

private function f_ctrs_bsc_and_bts_add(integer bts_nr, charstring countername, integer val := 1) runs on test_CT {
	f_counter_name_vals_list_add(g_ctr_bts, bts_nr, countername, val);
	f_ctrs_bsc_add(countername, val);
}

/*  f_ctrs_bsc_and_bts_init();
 *  f_do_thing(on_bts := 0);
 *  f_do_thing(on_bts := 0);
 *  f_do_other(on_bts := 1);
 *  f_ctrs_bsc_and_bts_add(0, "thing", 2);
 *  f_ctrs_bsc_and_bts_add(1, "other");
 *  f_ctrs_bsc_and_bts_verify();
 */
private function f_ctrs_bsc_and_bts_verify() runs on test_CT {
	f_counter_name_vals_expect_n(IPA_CTRL, "bts", g_ctr_bts);
	f_ctrs_bsc_verify();
}

/* convenience: f_ctrs_bsc_and_bts_add() and f_ctrs_bsc_and_bts_verify() in one call.
 *  f_ctrs_bsc_and_bts_init();
 *  f_do_thing(on_bts := 0);
 *  f_do_thing(on_bts := 0);
 *  f_do_thing(on_bts := 0);
 *  f_ctrs_bsc_and_bts_expect(0, "thing", 3);
 */
private function f_ctrs_bsc_and_bts_expect(integer bts_nr, charstring countername, integer val := 1) runs on test_CT {
	f_ctrs_bsc_and_bts_add(bts_nr, countername, val);
	f_ctrs_bsc_and_bts_verify();
}


/* Convenience functions for rate counters using g_ctr_bsc. */

private function f_ctrs_bsc_init(CounterNameVals counternames := counternames_bsc_bts_handover) runs on test_CT {
	g_ctr_bsc := f_counter_name_vals_get_n(IPA_CTRL, "bsc", 1, counternames);
	log("initial bsc rate counters: ", g_ctr_bsc);
}

private function f_ctrs_bsc_add(charstring countername, integer val := 1) runs on test_CT {
	f_counter_name_vals_list_add(g_ctr_bsc, 0, countername, val);
}

/*  f_ctrs_bsc_init();
 *  f_do_thing();
 *  f_do_thing();
 *  f_do_other();
 *  f_ctrs_bsc_add("thing", 2);
 *  f_ctrs_bsc_add("other");
 *  f_ctrs_bsc_verify();
 */
private function f_ctrs_bsc_verify() runs on test_CT {
	f_counter_name_vals_expect_n(IPA_CTRL, "bsc", g_ctr_bsc);
}

/* convenience: f_ctrs_bsc_add() and f_ctrs_bsc_verify() in one call.
 *  f_ctrs_bsc_init();
 *  f_do_thing();
 *  f_ctrs_bsc_expect("thing", 1);
 */
private function f_ctrs_bsc_expect(charstring countername, integer val := 1) runs on test_CT {
	f_ctrs_bsc_add(countername, val);
	f_ctrs_bsc_verify();
}


private function f_shutdown_helper() runs on test_CT {
	all component.stop;
	setverdict(pass);
	mtc.stop;
}

private function f_legacy_bssap_reset(integer bssap_idx := 0) runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;
	var boolean reset_received := false;
	timer T := 5.0;
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_bssap[bssap_idx].sccp_addr_peer, g_bssap[bssap_idx].sccp_addr_own,
					 ts_BSSMAP_Reset(0, g_osmux_enabled)));
	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(g_bssap[bssap_idx].sccp_addr_own, g_bssap[bssap_idx].sccp_addr_peer,
					       tr_BSSMAP_ResetAck(g_osmux_enabled))) {
		log("BSSMAP: Received RESET-ACK in response to RESET, we're ready to go!");
		}
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(?, ?, tr_BSSMAP_Reset(g_osmux_enabled))) -> value ud_ind {
		log("BSSMAP: Respoding to inbound RESET with RESET-ACK");
		BSSAP.send(ts_BSSAP_UNITDATA_req(ud_ind.callingAddress, ud_ind.calledAddress,
			   ts_BSSMAP_ResetAck(g_osmux_enabled)));
		reset_received := true;
		repeat;
		}
	[] BSSAP.receive { repeat; }
	[] T.timeout {
			log("BSSMAP: Timeout waiting for RESET-ACK after sending RESET");
			/* If we received a RESET after ours was sent, it
			   may be a race condition where the other peer beacame
			   available after we sent it, but we are in a desired
			   state anyway, so go forward. */
			if (not reset_received) {
				setverdict(fail);
			}
		}
	}
}

type record IPA_Client {
	/* IPA Emulation component reference */
	IPA_Emulation_CT vc_IPA,
	/* Unit-ID and other CCM parameters to use for IPA client emulation */
	IPA_CCM_Parameters ccm_pars,
	/* String identifier for this IPA Client */
	charstring id,
	/* Associated RSL Emulation Component (if any). Only used in "Handler mode" */
	RSL_Emulation_CT vc_RSL optional
}

/*! Start the IPA/RSL related bits for one IPA_Client.
 *  \param clnt IPA_Client for which to establish
 *  \param bsc_host IP address / hostname of the BSC
 *  \param bsc_port TCP port number of the BSC
 *  \param i number identifying this BTS
 *  \param handler_mode Start an RSL_Emulation_CT component (true) or not (false) */
function f_ipa_rsl_start(inout IPA_Client clnt, charstring bsc_host, PortNumber bsc_port, integer i,
			 boolean handler_mode := false)
runs on test_CT {
	timer T := 10.0;

	clnt.id := "IPA" & int2str(i) & "-RSL";
	clnt.vc_IPA := IPA_Emulation_CT.create(clnt.id & "-IPA");
	clnt.ccm_pars := c_IPA_default_ccm_pars;
	clnt.ccm_pars.name := "Osmocom TTCN-3 BTS Simulator";
	clnt.ccm_pars.unit_id := int2str(1234+i) & "/0/0";
	if (handler_mode) {
		clnt.vc_RSL := RSL_Emulation_CT.create(clnt.id & "-RSL");
		connect(clnt.vc_RSL:CCHAN_PT, self:RSL_CCHAN[i]);
	}

	map(clnt.vc_IPA:IPA_PORT, system:IPA_CODEC_PT);
	if (handler_mode) {
		connect(clnt.vc_IPA:IPA_RSL_PORT, clnt.vc_RSL:IPA_PT);
	} else {
		connect(clnt.vc_IPA:IPA_RSL_PORT, self:IPA_RSL[i]);
	}

	clnt.vc_IPA.start(IPA_Emulation.main_client(bsc_host, bsc_port, "", 10000+i, clnt.ccm_pars));
	if (handler_mode) {
		clnt.vc_RSL.start(RSL_Emulation.main());
		return;
	}

	/* wait for IPA RSL link to connect and send ID ACK */
	T.start;
	alt {
	[] IPA_RSL[i].receive(tr_ASP_IPA_EV(ASP_IPA_EVENT_ID_ACK)) {
		T.stop;
		IPA_RSL[i].send(ts_ASP_RSL_UD(ts_RSL_PAGING_LOAD_IND(23)));
		}
	[] IPA_RSL[i].receive(ASP_IPA_Event:?) { repeat }
	[] IPA_RSL[i].receive { repeat }
	[] T.timeout {
		setverdict(fail, "Timeout RSL waiting for ASP_IPA_EVENT_ID_ACK");
		mtc.stop;
		}
	}
}

function f_ipa_rsl_stop(inout IPA_Client clnt) runs on test_CT {
	if (not isbound(clnt) or not isbound(clnt.vc_IPA)) {
		return;
	}
	clnt.vc_IPA.stop;
	if (isbound(clnt.vc_RSL)) {
		clnt.vc_RSL.stop;
	}
}

/* Wait for the OML connection to be brought up by the external osmo-bts-omldummy */
function f_wait_oml(integer bts_nr, charstring status, float secs_max) runs on test_CT {
	timer T := secs_max;
	T.start;
	while (true) {
		if (f_ctrl_get_bts(IPA_CTRL, bts_nr, "oml-connection-state") == status) {
			T.stop;
			/* the 'degraded' state exists from OML connection time, and we have to wait
			 * until all MO's are initialized */
			T.start(1.0);
			T.timeout;
			return;
		}
		f_sleep(0.1);
		if (not T.running) {
			setverdict(fail, "Timeout waiting for BTS" & int2str(bts_nr) & " oml-connection-state ", status);
			mtc.stop;
		}
	}
}

/* global altstep for global guard timer; also takes care of responding RESET witH RESET-ACK */
altstep as_Tguard() runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;
	[] T_guard.timeout {
			setverdict(fail, "Timeout of T_guard");
			mtc.stop;
		}
	/* always respond with RESET ACK to RESET */
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(?, ?, tr_BSSMAP_Reset(g_osmux_enabled))) -> value ud_ind {
		BSSAP.send(ts_BSSAP_UNITDATA_req(ud_ind.callingAddress, ud_ind.calledAddress,
			   ts_BSSMAP_ResetAck(g_osmux_enabled)));
		repeat;
		}
}

altstep no_bssmap_reset() runs on test_CT {
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(?, ?, tr_BSSMAP_Reset(g_osmux_enabled))) {
		setverdict(fail, "unexpected BSSMAP Reset");
		mtc.stop;
	}
}

function f_init_mgcp(charstring id) runs on test_CT {
	id := id & "-MGCP";

	var MGCPOps ops := {
		create_cb := refers(MGCP_Emulation.ExpectedCreateCallback),
		unitdata_cb := refers(MGCP_Emulation.DummyUnitdataCallback)
	};
	var MGCP_conn_parameters mgcp_pars := {
		callagent_ip := mp_bsc_ip,
		callagent_udp_port := -1,
		mgw_ip := mp_test_ip,
		mgw_udp_port := 2427,
		/* Enable it for SCCPlite, since we have 2 MGCP sockets towards MGW (UDP one +
		   the on  with MGCP over IPA forwarded from MSC one) */
		multi_conn_mode := (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_SCCPlite_SERVER)
	};

	vc_MGCP := MGCP_Emulation_CT.create(id);
	vc_MGCP.start(MGCP_Emulation.main(ops, mgcp_pars, id));
}

/* Enable or disable (current default) Osmux. When enabling, BSSMAP Reset
 * contains extra IE (OsmuxSupport) and osmo-bsc will handle AssignReq with
 * OsmuxCID IE.
 */
private function f_vty_allow_osmux(boolean allow) runs on test_CT {
	f_vty_enter_cfg_msc(BSCVTY, 0);
	if (allow) {
		f_vty_transceive(BSCVTY, "osmux on");
	} else {
		f_vty_transceive(BSCVTY, "osmux off");
	}
	f_vty_transceive(BSCVTY, "exit");
	f_vty_transceive(BSCVTY, "exit");
	g_osmux_enabled := allow;
}

function f_init_vty(charstring id := "foo") runs on test_CT {
	if (BSCVTY.checkstate("Mapped")) {
		/* skip initialization if already executed once */
		return;
	}
	map(self:BSCVTY, system:BSCVTY);
	f_vty_set_prompts(BSCVTY);
	f_vty_transceive(BSCVTY, "enable");
	f_cs7_inst_0_cfg(BSCVTY, {"sccp-timer ias " & int2str(g_bsc_sccp_timer_ias),
			  "sccp-timer iar " & int2str(g_bsc_sccp_timer_iar)});
}

private function f_logp(TELNETasp_PT pt, charstring log_msg)
{
	// log on TTCN3 log output
	log(log_msg);
	// log in stderr log
	f_vty_transceive(pt, "logp lglobal notice TTCN3 f_logp(): " & log_msg);
}

private function f_sysinfo_seen(integer rsl_idx, RSL_Message rsl) runs on test_CT
{
	if (rsl_idx >= lengthof(g_system_information)) {
		g_system_information[rsl_idx] := SystemInformationConfig_omit
	}
	f_sysinfo_dec_raw(g_system_information[rsl_idx], rsl);
}

altstep as_catch_RSL_sysinfo(integer rsl_idx) runs on test_CT {
	var ASP_RSL_Unitdata rx_rsl_ud;

	/* For handler_mode := false, receiving the RSL bootstrap messages directly on IPA_RSL */
	[] IPA_RSL[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_NO_BCCH_INFO)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
	[] IPA_RSL[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_BCCH_INFO)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
	[] IPA_RSL[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_NO_SACCH_FILL)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
	[] IPA_RSL[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_SACCH_FILL)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}

	/* For handler_mode := true, receiving the RSL bootstrap messages via RSL_Emulation  */
	[] RSL_CCHAN[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_NO_BCCH_INFO)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
	[] RSL_CCHAN[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_BCCH_INFO)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
	[] RSL_CCHAN[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_NO_SACCH_FILL)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
	[] RSL_CCHAN[rsl_idx].receive(tr_ASP_RSL_UD(tr_RSL_SACCH_FILL)) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		repeat;
		}
}

/* TODO: use BooleanList from COMMON/src/General_Types.ttcn */
private type record of boolean my_BooleanList;

private function f_vty_msc_allow_attach(TELNETasp_PT pt, my_BooleanList allow_attach_list)
{
	var charstring config := f_vty_transceive_ret(pt, "show running-config");

	for (var integer msc_nr := 0; msc_nr < sizeof(allow_attach_list); msc_nr := msc_nr+1) {
		if (f_strstr(config, "\nmsc " & int2str(msc_nr) & "\n") < 0) {
			/* There is no 'msc N' for this msc_nr in the running config, so don't create an empty msc by
			 * stepping into that config node. */
			log("msc ", msc_nr, " is not configured, skipping");
			continue;
		}
		f_vty_enter_cfg_msc(pt, msc_nr);
		if (allow_attach_list[msc_nr]) {
			/* strict := false: ignore if osmo-bsc does not support this config option (latest build) */
			f_vty_transceive(pt, "allow-attach", strict := false);
		} else {
			f_vty_transceive(pt, "no allow-attach", strict := false);
		}
		f_vty_transceive(pt, "exit");
		f_vty_transceive(pt, "exit");
	}
}

/* global initialization function
 * \param nr_bts Number of BTSs we should start/bring up
 * \param handler_mode Start an RSL_Emulation_CT component (true) or not (false).
 * \param nr_msc Number of virtual MSCs to bring up to connect to osmo-bsc.
 */
function f_init(integer nr_bts := NUM_BTS, boolean handler_mode := false, boolean allow_osmux := false,
		integer nr_msc := 1, float guard_timeout := 30.0) runs on test_CT {
	var integer bssap_idx;

	if (g_initialized) {
		return;
	}
	g_initialized := true;

	T_guard.start(guard_timeout);
	activate(as_Tguard());

	f_init_vty("VirtMSC");
	if (mp_enable_osmux_test) {
		f_vty_allow_osmux(allow_osmux);
	}

	var my_BooleanList allow_attach := { false, false, false };
	f_init_statsd("VirtMSC", vc_STATSD, mp_test_ip, mp_bsc_statsd_port);

	for (bssap_idx := 0; bssap_idx < nr_msc; bssap_idx := bssap_idx+1) {
		allow_attach[bssap_idx] := true;
		/* Call a function of our 'parent component' RAN_Adapter_CT to start the
		 * MSC-side BSSAP emulation */
		if (handler_mode) {
			var RanOps ranops := MSC_RanOps;
			ranops.use_osmux := g_osmux_enabled;
			f_ran_adapter_init(g_bssap[bssap_idx], mp_bssap_cfg[bssap_idx], "VirtMSC", ranops);
			connect(self:SCCPLITE_IPA_CTRL, g_bssap[bssap_idx].vc_RAN:CTRL_CLIENT);
			f_ran_adapter_start(g_bssap[bssap_idx]);
		} else {
			f_ran_adapter_init(g_bssap[bssap_idx], mp_bssap_cfg[bssap_idx], "VirtMSC", omit);
			connect(self:BSSAP, g_bssap[bssap_idx].vc_SCCP:SCCP_SP_PORT);
			f_ran_adapter_start(g_bssap[bssap_idx]);
			f_legacy_bssap_reset();
		}
	}

	if (mp_enable_lcs_tests) {
		if (handler_mode) {
			f_bssap_le_adapter_init(g_bssap_le, mp_bssap_le_cfg, "VirtSMLC", SMLC_BssapLeOps);
		} else {
			f_bssap_le_adapter_init(g_bssap_le, mp_bssap_le_cfg, "VirtSMLC", omit);
			connect(self:BSSAP_LE, g_bssap_le.vc_SCCP:SCCP_SP_PORT);
		}
		f_bssap_le_adapter_start(g_bssap_le);
	}

	/* start the test with exactly all enabled MSCs allowed to attach */
	f_vty_msc_allow_attach(BSCVTY, allow_attach);

	f_ipa_ctrl_start(mp_bsc_ip, mp_bsc_ctrl_port);

	f_init_mgcp("VirtMSC");

	for (var integer i := 0; i < nr_bts; i := i+1) {
		f_init_bts(i, handler_mode);
	}
}

function f_init_bts(integer bts_idx := 0, boolean handler_mode := false)
runs on test_CT {
	/* wait until osmo-bts-omldummy has respawned */
	f_wait_oml(bts_idx, "degraded", 5.0);

	/* start RSL connection */
	f_ipa_rsl_start(bts[bts_idx].rsl, mp_bsc_ip, mp_bsc_rsl_port, bts_idx, handler_mode);
	/* wait until BSC tells us "connected" */
	f_wait_oml(bts_idx, "connected", 5.0);
}

function f_init_bts_and_check_sysinfo(integer bts_idx := 0, boolean handler_mode := false,
				      template SystemInformationConfig expect_si)
runs on test_CT {
	var default sysinfo := activate(as_catch_RSL_sysinfo(bts_idx));

	f_init_bts(bts_idx, handler_mode);

	/* Give some time to (hopefully/most likely) collect all system informations from RSL startup.
	 * We could stop as soon as all expected SI are received, but then we might miss SI that we don't expect and
	 * that might be sent afterwards. So rather give a generous timeout and be quite sure to catch all SI.
	 */
	f_sleep(5.0);
	log("RSL ", bts_idx, " SYSTEM INFORMATION: ", g_system_information[bts_idx]);

	deactivate(sysinfo);

	if (match(g_system_information[bts_idx], expect_si)) {
		setverdict(pass);
	} else {
		log("RSL ", bts_idx, ": EXPECTED SI: ", expect_si);
		log("RSL ", bts_idx, ": GOT SI: ", g_system_information[bts_idx]);
		setverdict(fail, "received SI does not match expectations");
		return;
	}
}

/* expect to receive a RSL message matching a specified template on a given BTS / stream */
function f_exp_ipa_rx(integer bts_nr, template (present) RSL_Message t_rx, float t_secs := 2.0, IpaStreamId sid := IPAC_PROTO_RSL_TRX0)
runs on test_CT return RSL_Message {
	var ASP_RSL_Unitdata rx_rsl_ud;
	timer T := t_secs;

	T.start;
	alt {
	[] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(t_rx, sid)) -> value rx_rsl_ud {
		T.stop;
		}
	[] IPA_RSL[bts_nr].receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout expecting ", t_rx);
		mtc.stop;
		}
	}
	return rx_rsl_ud.rsl;
}

/* helper function to transmit RSL on a given BTS/stream */
function f_ipa_tx(integer bts_nr, template (value) RSL_Message t_tx, IpaStreamId sid := IPAC_PROTO_RSL_TRX0)
runs on test_CT {
	IPA_RSL[bts_nr].send(ts_ASP_RSL_UD(t_tx, sid));
}


/* verify we get a CHAN_ACT after CHAN RQD */
testcase TC_chan_act_noreply() runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;
	var RSL_Message rsl_unused;

	f_init(1);

	IPA_RSL[0].send(ts_ASP_RSL_UD(ts_RSL_CHAN_RQD('23'O, 23)));
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	f_shutdown_helper();
}

/* verify if the "chreq:total" counter increments as expected */
testcase TC_chan_act_counter() runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;
	var integer chreq_total;
	var RSL_Message rsl_unused;

	f_init(1);

	chreq_total := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total");
	IPA_RSL[0].send(ts_ASP_RSL_UD(ts_RSL_CHAN_RQD('23'O, 23)));
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total", chreq_total+1);

	f_shutdown_helper();
}

/* CHAN RQD -> CHAN ACT -> CHAN ACT ACK -> RF CHAN REL */
private function f_TC_chan_act_ack_noest(OCT1 ra := '23'O) runs on test_CT {
	var RSL_Message rx_rsl;

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	var RslChannelNr chan_nr := f_chreq_act_ack(ra);

	/* expect BSC to disable the channel again if there's no RLL EST IND */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);

	f_shutdown_helper();
}

/* Normal variant */
testcase TC_chan_act_ack_noest() runs on test_CT {
	 f_init(1);
	 f_TC_chan_act_ack_noest();
}

/* Emergency call variant */
testcase TC_chan_act_ack_noest_emerg() runs on test_CT {
	 /* See also: 3GPP TS 04.08, Table 9.9, ra=101xxxxx */
	 f_init(1);
	 f_vty_allow_emerg_bts(true, 0);
	 f_TC_chan_act_ack_noest(ra := 'A5'O);
}

/* Emergency call variant, but emergency calls are not allowed */
testcase TC_chan_rqd_emerg_deny() runs on test_CT {
	 /* See also: 3GPP TS 04.08, Table 9.9, ra=101xxxxx */

	 var RSL_Message rx_rsl;
	 var GsmRrMessage rr;

	 f_init(1);
	 f_vty_allow_emerg_bts(false, 0);

	 IPA_RSL[0].clear;
	 f_ipa_tx(0, ts_RSL_CHAN_RQD('A5'O, 23));

	 rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeC(RSL_MT_IMMEDIATE_ASSIGN_CMD));
	 rr := dec_GsmRrMessage(rx_rsl.ies[1].body.full_imm_ass_info.payload);
	 if (rr.header.message_type == IMMEDIATE_ASSIGNMENT_REJECT) {
		setverdict(pass);
	 } else {
		setverdict(fail, "immediate assignment not rejected");
	 }
}

/* Test behavior if MSC never answers to CR */
testcase TC_chan_act_ack_est_ind_noreply() runs on test_CT {
	var RslLinkId main_dcch := valueof(ts_RslLinkID_DCCH(0));
	var IpaStreamId sid := IPAC_PROTO_RSL_TRX0;
	var RSL_Message rx_rsl;
	var ASP_RSL_Unitdata rx_rsl_ud;

	f_init(1);

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3)));

	/* expect BSC to disable the channel again if there's no response from MSC */
	/* MS waits 20s (T3210) at LU; 10s (T3230) at CM SERV REQ and 5s (T3220) AT detach */
	f_expect_chan_rel(0, chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

/* Test behavior if MSC answers with CREF to CR */
testcase TC_chan_act_ack_est_ind_refused() runs on test_CT {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var RSL_Message rx_rsl;

	f_init(1);

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) -> value rx_c_ind;
	BSSAP.send(ts_BSSAP_DISC_req(rx_c_ind.connectionId, 0));

	/* expect BSC to disable the channel */
	f_expect_chan_rel(0, chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

/* CHAN RQD -> CHAN ACT -> CHAN ACT NACK -> RF CHAN REL */
testcase TC_chan_act_nack() runs on test_CT {
	var RSL_Message rx_rsl;
	var integer chact_nack;

	f_init(1);

	chact_nack := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chan_act:nack");

	f_ipa_tx(0, ts_RSL_CHAN_RQD('33'O, 33));
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	var RslChannelNr chan_nr := rx_rsl.ies[0].body.chan_nr;

	f_ipa_tx(0, ts_RSL_CHAN_ACT_NACK(chan_nr, RSL_ERR_EQUIPMENT_FAIL));

	/* wait for some time to hope the NACK arrives before the CTRL GET below */
	f_sleep(0.5);

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chan_act:nack", chact_nack+1);

	f_shutdown_helper();
}

/* Test for channel exhaustion due to RACH overload */
testcase TC_chan_exhaustion() runs on test_CT {
	var ASP_RSL_Unitdata rsl_ud;
	var integer i;
	var integer chreq_total, chreq_nochan;

	f_init(1);

	chreq_total := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total");
	chreq_nochan := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel");

	/* GSM 04.08 Table 9.9a:
	 * RA = '33'O -> Establishment cause = 0011xxxx (MS dual rate capable and asks for "TCH/H or TCH/F").
	 * With current setup, expect 4xSDCCH + 4xTCH/F + 1xTCH/H to succeed */
	for (i := 0; i < NUM_TCHF_PER_BTS + NUM_TCHH_PER_BTS + NUM_SDCCH_PER_BTS; i := i+1) {
		var RslChannelNr chan_nr := f_chreq_act_ack('33'O, i);
	}

	IPA_RSL[0].clear;

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total",
				   chreq_total + NUM_TCHF_PER_BTS + NUM_TCHH_PER_BTS + NUM_SDCCH_PER_BTS);

	/* now expect additional channel activations to fail */
	f_ipa_tx(0, ts_RSL_CHAN_RQD('42'O, 42));

	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV))) {
		setverdict(fail, "Received CHAN ACT ACK without resources?!?");
		}
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_IMM_ASSIGN(?))) -> value rsl_ud {
		var GsmRrMessage rr;
		/* match on IMM ASS REJ */
		rr := dec_GsmRrMessage(rsl_ud.rsl.ies[1].body.full_imm_ass_info.payload);
		if (rr.header.message_type == IMMEDIATE_ASSIGNMENT_REJECT) {
			f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total",
						   chreq_total + NUM_TCHF_PER_BTS + NUM_TCHH_PER_BTS + NUM_SDCCH_PER_BTS+1);
			f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel",
						   chreq_nochan+1);
			setverdict(pass);
		} else {
			repeat;
		}
		}
	[] IPA_RSL[0].receive { repeat; }
	}
	f_shutdown_helper();
}

/* Test channel deactivation due to silence from MS */
testcase TC_chan_deact_silence() runs on test_CT {
	var RslChannelNr chan_nr;

	f_init(1);

	/* Request for a dedicated channel */
	chan_nr := f_chreq_act_ack('23'O);

	/* Wait some time until the channel is released */
	f_sleep(2.0);

	/* Expect CHANnel RELease */
	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL))) {
		log("Received CHANnel RELease");
		setverdict(pass);
		}
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_IMM_ASSIGN(?))) {
		/* See OS#3709, OsmoBSC should not send Immediate
		 * Assignment Reject since a dedicated channel was
		 * already allocated, and Immediate Assignment was
		 * already sent. */
		setverdict(fail, "Unexpected Immediate Assignment!");
		}
	[] IPA_RSL[0].receive {
		setverdict(fail, "Unexpected RSL message!");
		}
	}
	f_shutdown_helper();
}

/***********************************************************************
 * Assignment Testing
 ***********************************************************************/

/* Verify that the BSC refuses any BSSAP connection from the MSC (They are all BSC->MSC direction,
 * except for the inter-BSC handover, MT side) */
testcase TC_outbound_connect(integer bssap_idx := 0) runs on test_CT {
	f_init(1);

	BSSAP.send(ts_BSSAP_CONNECT_req(g_bssap[bssap_idx].sccp_addr_peer, g_bssap[bssap_idx].sccp_addr_own,
				        2342, ts_BSSMAP_AssignmentReq));
	BSSAP.receive(tr_BSSAP_DISC_ind(2342, ?, ?));
	f_shutdown_helper();
}

/* Test behavior if MSC answers with CREF to CR */
testcase TC_assignment_cic_only(integer bssap_idx := 0) runs on test_CT {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00000000'O);
	if (mp_bssap_cfg[bssap_idx].transport == BSSAP_TRANSPORT_AoIP) {
		/* send assignment without AoIP IEs */
		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_AssignmentReq(ts_BSSMAP_IE_CIC(0, 1))));
	} else {
		/* Send assignmetn without CIC in IPA case */
		var BSSMAP_IE_AoIP_TransportLayerAddress tla :=
						valueof(ts_BSSMAP_IE_AoIP_TLA4('01020304'O, 2342));
		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_AssignmentReq(omit, tla)));
	}
	alt {
	[] BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_AssignmentComplete)) {
		setverdict(fail, "AoIP BSC cannot accept ASSIGNMENT without AoIP Transport IE");
		}
	/* TODO: Actually expect GSM0808_CAUSE_REQ_A_IF_TYPE_NOT_SUPP */
	[] BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_AssignmentFail)) {
		setverdict(pass);
		}
	[] BSSAP.receive { repeat; }
	}
	f_shutdown_helper();
}

/* generate an assignment request for either AoIP or SCCPlite */
function f_gen_ass_req(boolean osmux_enabled := false, integer bssap_idx := 0, charstring aoip_tla := "1.2.3.4") return PDU_BSSAP {
	var PDU_BSSAP ass_cmd;
	var BSSMAP_IE_Osmo_OsmuxCID osmux_cid := valueof(ts_OsmuxCID(0));
	if (mp_bssap_cfg[bssap_idx].transport == BSSAP_TRANSPORT_AoIP) {
		var BSSMAP_IE_AoIP_TransportLayerAddress tla :=
			valueof(f_ts_BSSMAP_IE_AoIP_TLA(aoip_tla, 2342));
		if (osmux_enabled) {
			ass_cmd := valueof(ts_BSSMAP_AssignmentReq(omit, tla, osmux_cid));
		} else {
			ass_cmd := valueof(ts_BSSMAP_AssignmentReq(omit, tla));
		}
	} else {
		var BSSMAP_IE_CircuitIdentityCode cic := valueof(ts_BSSMAP_IE_CIC(0,1));
		ass_cmd := valueof(ts_BSSMAP_AssignmentReq(cic, omit));
	}
	return ass_cmd;
}

function f_gen_handover_req(integer bssap_idx := 0, charstring aoip_tla := "1.2.3.4") return PDU_BSSAP {
	var PDU_BSSAP ho_req;
	if (mp_bssap_cfg[bssap_idx].transport == BSSAP_TRANSPORT_AoIP) {
		var BSSMAP_IE_AoIP_TransportLayerAddress tla :=
			valueof(f_ts_BSSMAP_IE_AoIP_TLA(aoip_tla, 2342));
		ho_req := valueof(ts_BSSMAP_HandoverRequest(omit, tla));
	} else {
		var BSSMAP_IE_CircuitIdentityCode cic := valueof(ts_BSSMAP_IE_CIC(0,1));
		ho_req := valueof(ts_BSSMAP_HandoverRequest(cic, omit));
	}
	return ho_req;
}

/* generate an assignment complete template for either AoIP or SCCPlite */
function f_gen_exp_compl(boolean expect_osmux := false, integer bssap_idx := 0) return template PDU_BSSAP {
	var template PDU_BSSAP exp_compl;
	var BSSMAP_IE_Osmo_OsmuxCID osmux_cid := valueof(ts_OsmuxCID(0));
	if (mp_bssap_cfg[bssap_idx].transport == BSSAP_TRANSPORT_AoIP) {
		if (expect_osmux) {
			exp_compl := tr_BSSMAP_AssignmentComplete(omit, ?, osmux_cid);
		} else {
			exp_compl := tr_BSSMAP_AssignmentComplete(omit, ?, omit);
		}
	} else {
		/* CIC is optional "*" as the MSC allocated it */
		exp_compl := tr_BSSMAP_AssignmentComplete(*, omit);
	}
	return exp_compl;
}

/* Run everything required up to sending a caller-specified assignment command and expect response */
function f_assignment_exp(PDU_BSSAP ass_cmd, template PDU_BSSAP exp, charstring fail_text)
runs on test_CT {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00000000'O);
	/* send assignment without AoIP IEs */
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ass_cmd));
	alt {
	[] BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_AssignmentComplete)) {
		if (ischosen(exp.pdu.bssmap.assignmentComplete)) {
			setverdict(pass);
		} else {
			setverdict(fail, fail_text);
		}
		}
	[] BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_AssignmentFail)) {
		if (ischosen(exp.pdu.bssmap.assignmentFailure)) {
			setverdict(pass);
		} else {
			setverdict(fail, fail_text);
		}
		}
	[] BSSAP.receive { repeat; }
	}
}
testcase TC_assignment_csd() runs on test_CT {
	var template PDU_BSSAP exp_fail := tr_BSSMAP_AssignmentFail;
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelTypeCSD);
	//exp_fail.pdu.bssmap.assignmentFailure.cause.causeValue := int2bit(enum2int(GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_UNAVAIL), 7);
	f_assignment_exp(ass_cmd, exp_fail, "BSC accepted Assignment for CSD");
	f_shutdown_helper();
}

testcase TC_assignment_ctm() runs on test_CT {
	var template PDU_BSSAP exp_fail := tr_BSSMAP_AssignmentFail;
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelTypeCTM);
	//exp_fail.pdu.bssmap.assignmentFailure.cause.causeValue := int2bit(enum2int(GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_UNAVAIL), 7);
	f_assignment_exp(ass_cmd, exp_fail, "BSC accepted Assignment for Speech+CTM");
	f_shutdown_helper();
}

type record DchanTuple {
	integer sccp_conn_id,
	RslChannelNr rsl_chan_nr
}

/* Send CHAN RQD and wait for allocation; acknowledge it */
private function f_chreq_act_ack(OCT1 ra := '23'O, GsmFrameNumber fn := 23)
runs on test_CT return RslChannelNr {
	var RSL_Message rx_rsl;
	f_ipa_tx(0, ts_RSL_CHAN_RQD(ra, fn));
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	var RslChannelNr chan_nr := rx_rsl.ies[0].body.chan_nr;
	f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(chan_nr, fn+10));
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_IMM_ASSIGN(0));
	return chan_nr;
}

/* helper function to establish a dedicated channel via BTS and MSC */
function f_est_dchan(OCT1 ra, GsmFrameNumber fn, octetstring l3)
runs on test_CT return DchanTuple {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var DchanTuple dt;

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	dt.rsl_chan_nr := f_chreq_act_ack(ra, fn);

	f_ipa_tx(0, ts_RSL_EST_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) -> value rx_c_ind;
	dt.sccp_conn_id := rx_c_ind.connectionId;
	BSSAP.send(ts_BSSAP_CONNECT_res(dt.sccp_conn_id));

	return dt;
}

/* expect RF CAN REL from BTS, acknowledge it and clear the MSC side */
private function f_exp_chan_rel_and_clear(DchanTuple dt, integer bts_nr := 0) runs on test_CT {
	var RSL_Message rx_rsl;
	/* expect BSC to disable the channel */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);
	/* respond with CHAN REL ACK */
	f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));

	/* expect Clear Complete from BSC */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete));

	/* MSC disconnects as instructed. */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
}

/* Test behavior of channel release after unilateral RLL REL IND (DISC from MS) */
testcase TC_chan_rel_rll_rel_ind() runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* simulate RLL REL IND */
	f_ipa_tx(0, ts_RSL_REL_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0))));

	/* expect Clear Request on MSC side */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearRequest)) -> value rx_di;

	/* Instruct BSC to clear channel */
	var BssmapCause cause := bit2int(rx_di.userData.pdu.bssmap.clearRequest.cause.causeValue);
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

	/* expect BSC to disable the channel */
	f_exp_chan_rel_and_clear(dt, 0);

	/* wait for SCCP emulation to do its job */
	f_sleep(1.0);

	f_shutdown_helper();
}

/* Test behavior of channel release after CONN FAIL IND from BTS */
testcase TC_chan_rel_conn_fail() runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* simulate CONN FAIL IND */
	f_ipa_tx(0, ts_RSL_CONN_FAIL_IND(dt.rsl_chan_nr, RSL_ERR_RADIO_LINK_FAIL));
	/* TODO: different cause values? */

	/* expect Clear Request from BSC */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearRequest)) -> value rx_di;

	/* Instruct BSC to clear channel */
	var BssmapCause cause := bit2int(rx_di.userData.pdu.bssmap.clearRequest.cause.causeValue);
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

	/* expect BSC to disable the channel */
	f_exp_chan_rel_and_clear(dt, 0);

	/* wait for SCCP emulation to do its job */
	f_sleep(1.0);

	f_shutdown_helper();
}

/* Test behavior of early CONN FAIL IND from BTS (before EST IND!) */
/* See also https://www.osmocom.org/issues/3182 */
testcase TC_early_conn_fail() runs on test_CT {
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	/* BTS->BSC: Send CHAN RQD and wait for allocation; acknowledge it */
	dt.rsl_chan_nr := f_chreq_act_ack(f_rnd_ra_cs(), 23);

	/* BTS->BSC: simulate CONN FAIL IND */
	f_ipa_tx(0, ts_RSL_CONN_FAIL_IND(dt.rsl_chan_nr, RSL_ERR_RADIO_LINK_FAIL));

	/* BTS->BSC: Expect RF channel release from BSC on Abis */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), 10.0);

	/* BTS<-BSC: respond with CHAN REL ACK */
	f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));

	f_shutdown_helper();
}

/* Test behavior of late CONN FAIL IND from BTS (ater REL IND!) */
/* See also https://www.osmocom.org/issues/3182 */
testcase TC_late_conn_fail() runs on test_CT {
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* BSC<-MSC: Instruct BSC to clear connection */
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(0)));

	/* BTS->BSC: expect BSC to deactivate SACCH */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_DEACT_SACCH(dt.rsl_chan_nr));

	/* BTS->BSC: simulate a late CONN FAIL IND from BTS */
	f_ipa_tx(0, ts_RSL_CONN_FAIL_IND(dt.rsl_chan_nr, RSL_ERR_RADIO_LINK_FAIL));

	/* BTS<-BSC: Expect RF channel release from BSC on Abis */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), 10.0);
	/* BTS->BSC: respond with CHAN REL ACK */
	f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));

	/* BSC->MSC: expect Clear Complete from BSC */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete));

	/* BSC<-MSC: MSC disconnects as requested. */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));

	f_shutdown_helper();
}

function f_expect_chan_rel(integer bts_nr, RslChannelNr rsl_chan_nr,
			   boolean expect_deact_sacch := true,
			   boolean expect_rr_chan_rel := true,
			   boolean expect_rll_rel_req := true,
			   boolean handle_rll_rel := true,
			   boolean is_csfb := false,
			   template CellSelIndValue csfb_expect_cells := omit,
			   template RR_Cause expect_rr_cause := ?
			   ) runs on test_CT {

	var RslLinkId main_dcch := valueof(ts_RslLinkID_DCCH(0));
	var boolean got_deact_sacch := false;
	var boolean got_rr_chan_rel := false;
	var boolean got_rll_rel_req := false;
	var ASP_RSL_Unitdata ud;
	var RSL_IE_Body l3_ie;
	var PDU_ML3_NW_MS l3;
	var RR_Cause got_cause;
	log("f_expect_chan_rel() expecting: expect_deact_sacch=", expect_deact_sacch, " expect_rr_chan_rel=", expect_rr_chan_rel,
	    " expect_rll_rel_req=", expect_rll_rel_req);
	alt {
	[] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(tr_RSL_DEACT_SACCH(rsl_chan_nr))) {
		got_deact_sacch := true;
		repeat;
	}
	[is_csfb] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(tr_RSL_DATA_REQ(rsl_chan_nr, ?, decmatch tr_RRM_RR_RELEASE_CSFB))) -> value ud {
		got_rr_chan_rel := true;

		if (f_rsl_find_ie(ud.rsl, RSL_IE_L3_INFO, l3_ie) == false) {
			setverdict(fail, "cannot find L3");
			mtc.stop;
		}
		l3 := dec_PDU_ML3_NW_MS(l3_ie.l3_info.payload);

		if (not istemplatekind(csfb_expect_cells, "omit")) {
			var CellSelIndValue cells := dec_CellSelIndValue(
				l3.msgs.rrm.channelRelease.cellSelectionIndicator.cellSelectionIndicatorValue);

			log("GOT RR CHANNEL RELEASE CSFB CELLS: ", cells);
			if (match(cells, csfb_expect_cells)) {
				setverdict(pass);
			} else {
				log("EXPECTED CSFB CELLS: ", csfb_expect_cells);
				setverdict(fail, "Received CSFB cells list on RR Channel Release does not match expectations");
			}
		}

		if (not istemplatekind(expect_rr_cause, "omit")) {
			int2enum(oct2int(l3.msgs.rrm.channelRelease.rRCause.valuePart), got_cause);
			log("GOT CAUSE CODE: ", l3.msgs.rrm.channelRelease.rRCause.valuePart, " = ", got_cause);
			if (match(got_cause, expect_rr_cause)) {
				setverdict(pass);
			} else {
				log("EXPECTED CAUSE CODE: ", expect_rr_cause);
				setverdict(fail, "Received RR Channel Release Cause code does not match expectations");
			}
		}
		repeat;
	}
	[not is_csfb] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(tr_RSL_DATA_REQ(rsl_chan_nr, ?, decmatch tr_RRM_RR_RELEASE))) -> value ud {
		got_rr_chan_rel := true;

		if (not istemplatekind(expect_rr_cause, "omit")) {
			if (f_rsl_find_ie(ud.rsl, RSL_IE_L3_INFO, l3_ie) == false) {
				setverdict(fail, "cannot find L3");
				mtc.stop;
			}
			l3 := dec_PDU_ML3_NW_MS(l3_ie.l3_info.payload);

			int2enum(oct2int(l3.msgs.rrm.channelRelease.rRCause.valuePart), got_cause);
			log("GOT CAUSE CODE: ", l3.msgs.rrm.channelRelease.rRCause.valuePart, " = ", got_cause);
			if (match(got_cause, expect_rr_cause)) {
				setverdict(pass);
			} else {
				log("EXPECTED CAUSE CODE: ", expect_rr_cause);
				setverdict(fail, "Received RR Channel Release Cause code does not match expectations");
			}
		}
		repeat;
	}
	[] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(tr_RSL_REL_REQ(rsl_chan_nr, ?))) {
		got_rll_rel_req := true;
		/* FIXME: Why are we getting this for LinkID SACCH? */
		if (handle_rll_rel) {
			f_ipa_tx(0, ts_RSL_REL_CONF(rsl_chan_nr, main_dcch));
		}
		repeat;
	}
	[] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL))) {
		/* respond with CHAN REL ACK */
		f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(rsl_chan_nr));
		}
	/* ignore any user data */
	[] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(tr_RSL_MsgTypeR(?))) {
		repeat;
		}
	}

	log("f_expect_chan_rel() summary: got_deact_sacch=", got_deact_sacch, " got_rr_chan_rel=", got_rr_chan_rel,
	    " got_rll_rel_req=", got_rll_rel_req);

	if (expect_deact_sacch != got_deact_sacch) {
		setverdict(fail, "f_expect_chan_rel(): expect_deact_sacch=", expect_deact_sacch, " got_deact_sacch=", got_deact_sacch);
	}
	if (expect_rr_chan_rel != got_rr_chan_rel) {
		setverdict(fail, "f_expect_chan_rel(): expect_rr_chan_rel=", expect_rr_chan_rel, " got_rr_chan_rel=", got_rr_chan_rel);
	}
	if (expect_rll_rel_req != got_rll_rel_req) {
		setverdict(fail, "f_expect_chan_rel(): expect_rll_rel_req=", expect_rll_rel_req, " got_rll_rel_req=", got_rll_rel_req);
	}
}

/* Test behavior of channel release after hard Clear Command from MSC */
testcase TC_chan_rel_hard_clear() runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* Instruct BSC to clear channel */
	var BssmapCause cause := 0;
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

	/* expect Clear Complete from BSC on A */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete)) {
		/* release the SCCP connection */
		BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	}

	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

/* Test behavior of channel release after Clear Command with CSFB indicator from MSC */
testcase TC_chan_rel_hard_clear_csfb() runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* Instruct BSC to clear channel */
	var BssmapCause cause := 0;
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommandCSFB(cause)));

	/* expect Clear Complete from BSC on A */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete)) {
		/* release the SCCP connection */
		BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	}

	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false, is_csfb := true);
	f_shutdown_helper();
}

/* Test behavior of channel release after hard RLSD from MSC */
testcase TC_chan_rel_hard_rlsd() runs on test_CT {
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* release the SCCP connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));

	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

/* Test behavior of channel release after hard RLSD from MSC and MS is not responding to RLL REL REQ */
testcase TC_chan_rel_hard_rlsd_ms_dead() runs on test_CT {
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* release the SCCP connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));

	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

/* Test behavior of channel release after BSSMAP RESET from MSC */
testcase TC_chan_rel_a_reset() runs on test_CT {
	var DchanTuple dt;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* Clear the queue, it might still contain stuff like IMMEDIATE ASSIGN */
	IPA_RSL[0].clear;

	/* perform BSSAP RESET, expect RESET ACK and DISC.ind on connection */
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_bssap[0].sccp_addr_peer, g_bssap[0].sccp_addr_own, ts_BSSMAP_Reset(0, g_osmux_enabled)));
	interleave {
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(g_bssap[0].sccp_addr_own, g_bssap[0].sccp_addr_peer, tr_BSSMAP_ResetAck(g_osmux_enabled))) { }
	[] BSSAP.receive(tr_BSSAP_DISC_ind(dt.sccp_conn_id, ?, ?)) { }
	}

	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

/* Verify T(iar) triggers and releases the channel */
testcase TC_chan_rel_sccp_tiar_timeout() runs on test_CT {
	var DchanTuple dt;

	/* Set T(iar) in BSC low enough that it will trigger before other side
	   has time to keep alive with a T(ias). Keep recommended ratio of
	   T(iar) >= T(ias)*2 */
	g_bsc_sccp_timer_ias := 2;
	g_bsc_sccp_timer_iar := 5;

	f_init(1);

	dt := f_est_dchan('23'O, 23, '00010203040506'O);
	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);
	f_shutdown_helper();
}

private function f_tc_chan_rel_rr_cause(myBSSMAP_Cause clear_cmd_cause, template RR_Cause expect_rr_cause)
runs on test_CT
{
	var DchanTuple dt;

	dt := f_est_dchan('23'O, 23, '00010203040506'O);
	var BssmapCause cause := 0;
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(enum2int(clear_cmd_cause))));
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete)) {
		BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	}

	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false, expect_rr_cause := expect_rr_cause);
	f_shutdown_helper();
}

/* Test that Clear Command cause codes affect the RR Channel Release cause code */
testcase TC_chan_rel_rr_cause() runs on test_CT {
	f_init(1);

	f_tc_chan_rel_rr_cause(GSM0808_CAUSE_CALL_CONTROL, GSM48_RR_CAUSE_NORMAL);
	f_tc_chan_rel_rr_cause(GSM0808_CAUSE_HANDOVER_SUCCESSFUL, GSM48_RR_CAUSE_NORMAL);
	f_tc_chan_rel_rr_cause(GSM0808_CAUSE_PREEMPTION, GSM48_RR_CAUSE_PREMPTIVE_REL);
	f_tc_chan_rel_rr_cause(GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE, GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
	f_tc_chan_rel_rr_cause(GSM0808_CAUSE_RADIO_INTERFACE_FAILURE, GSM48_RR_CAUSE_ABNORMAL_UNSPEC);
	f_tc_chan_rel_rr_cause(GSM0808_CAUSE_EQUIPMENT_FAILURE, GSM48_RR_CAUSE_ABNORMAL_UNSPEC);
}

/* Test behavior if RSL EST IND for non-active channel */
testcase TC_rll_est_ind_inact_lchan() runs on test_CT {
	timer T := 2.0;

	f_init(1);

	var octetstring l3 := '00010203040506'O;
	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(6));
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for non-active lchan");
		}
	[] BSSAP.receive {}
	[] IPA_RSL[0].receive {}
	[] T.timeout {}
	}

	f_shutdown_helper();
}

/* Test behavior if RSL EST IND for invalid SAPI */
testcase TC_rll_est_ind_inval_sapi1() runs on test_CT {
	var RslChannelNr chan_nr;

	f_init(1);

	chan_nr := f_chreq_act_ack()

	var octetstring l3 := '00010203040506'O;
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(1)), l3));

	timer T := 2.0;
	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for invalid SAPI 1");
		}
	[] BSSAP.receive { repeat; }
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {}
	}

	f_shutdown_helper();
}

/* Test behavior if RSL EST IND for invalid SAPI */
testcase TC_rll_est_ind_inval_sapi3() runs on test_CT {
	timer T := 2.0;

	f_init(1);

	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O;
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(3)), l3));

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for invalid SAPI 3");
		}
	[] BSSAP.receive { repeat; }
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {}
	}

	f_shutdown_helper();
}

/* Test behavior if RSL EST IND for invalid SACCH */
testcase TC_rll_est_ind_inval_sacch() runs on test_CT {
	timer T := 2.0;

	f_init(1);

	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O;
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_SACCH(0)), l3));

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for invalid Link SACCH");
		}
	[] BSSAP.receive { repeat; }
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {}
	}

	f_shutdown_helper();
}

/* Verify DLCI / RSL Link ID conversion for MO/MT messages on SAPI0/SAPI3 */
private function f_TC_tch_dlci_link_id_sapi(charstring id) runs on MSC_ConnHdlr {
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();

	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));

	f_establish_fully(ass_cmd, exp_compl);

	/* SAPI0 has already been established by f_establish_fully(), establish SAPI3 */
	RSL.send(ts_RSL_EST_IND(g_chan_nr, ts_RslLinkID_SACCH(3), '0904'O));
	/* Expect BSSAP/DTAP on SAPI3 (DLCI IE) */
	BSSAP.receive(PDU_BSSAP:{
		discriminator := '1'B,
		spare := '0000000'B,
		dlci := 'C3'O,
		lengthIndicator := ?,
		pdu := { dtap := '0904'O }
	});

	/* Send messages on DCCH/SAPI0 and ACCH/SAPI3 */
	for (var integer i := 0; i < 32; i := i + 1) {
		var octetstring l3 := '09'O & f_rnd_octstring(14);
		var template (value) RslLinkId link_id;
		var template (value) OCT1 dlci;

		if (i mod 2 == 0) {
			/* SAPI0 on FACCH or SDCCH */
			link_id := ts_RslLinkID_DCCH(0);
			dlci := '80'O;
		} else {
			/* SAPI3 on SACCH */
			link_id := ts_RslLinkID_SACCH(3);
			dlci := 'C3'O;
		}

		/* Send MO message: RSL -> BSSAP */
		f_mo_l3_transceive(RSL, link_id, dlci, l3);
		/* Send MT message: BSSAP -> RSL */
		f_mt_l3_transceive(RSL, link_id, dlci, l3);
	}
}
testcase TC_tch_dlci_link_id_sapi() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_TC_tch_dlci_link_id_sapi), pars);
	vc_conn.done;

	f_shutdown_helper();
}

private function f_exp_sapi_n_reject(template (present) GsmSapi sapi := ?,
				     template myBSSMAP_Cause cause := ?,
				     float T_val := 2.0)
runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	timer T;

	var template BSSMAP_IE_Cause tr_cause := tr_BSSMAP_IE_Cause(cause);
	var template PDU_BSSAP tr_pdu := tr_BSSMAP_SAPInReject(sapi);

	T.start(T_val);
	alt {
	[] BSSAP.receive(tr_BSSAP_DATA_ind(?, tr_pdu)) -> value rx_di {
		var BSSMAP_IE_Cause rx_cause := rx_di.userData.pdu.bssmap.sAPInReject.cause;
		if (not match(rx_cause, tr_cause)) {
			setverdict(fail, "Rx unexpected Cause IE: ",
				   rx_cause, " vs expected ", tr_cause);
		}
		setverdict(pass);
		}
	[] BSSAP.receive(BSSAP_N_DATA_ind:?) -> value rx_di {
		setverdict(fail, "Rx unexpected BSSAP PDU: ", rx_di);
		}
	[] T.timeout {
		setverdict(fail, "Timeout waiting for BSSMAP SAPI N Reject");
		}
	}
}

/* Check if we get SAPI N Reject on receipt of unexpected RLL RELease INDication */
testcase TC_rll_rel_ind_sapi_n_reject() runs on test_CT {
	var octetstring rnd_data := f_rnd_octstring(16);
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	/* MS establishes a SAPI=0 link on DCCH */
	dt := f_est_dchan(f_rnd_ra_cs(), 23, rnd_data);

	/* MSC sends some data on (not yet established) SAPI=3 link */
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSAP_DTAP(rnd_data, '03'O)));
	/* BSC attempts to establish a SAPI=3 link on DCCH */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_EST_REQ(dt.rsl_chan_nr, tr_RslLinkID_DCCH(3)));

	/* MS sends unexpected RELease INDication on SAPI=3 */
	f_ipa_tx(0, ts_RSL_REL_IND(dt.rsl_chan_nr, ts_RslLinkID_DCCH(3)));
	/* We expect to receive BSSMAP SAPI N Reject message from the BSC */
	f_exp_sapi_n_reject(3, GSM0808_CAUSE_MS_NOT_EQUIPPED);

	/* Clean up the connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);

	f_shutdown_helper();
}

/* Check if we get SAPI N Reject on receipt of unexpected RLL ERROR INDication */
testcase TC_rll_err_ind_sapi_n_reject() runs on test_CT {
	var octetstring rnd_data := f_rnd_octstring(16);
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	/* MS establishes a SAPI=0 link on DCCH */
	dt := f_est_dchan(f_rnd_ra_cs(), 23, rnd_data);

	/* MSC sends some data on (not yet established) SAPI=3 link */
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSAP_DTAP(rnd_data, '03'O)));
	/* BSC attempts to establish a SAPI=3 link on DCCH */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_EST_REQ(dt.rsl_chan_nr, tr_RslLinkID_DCCH(3)));

	/* BTS sends unexpected ERROR INDication on SAPI=3 */
	f_ipa_tx(0, ts_RSL_ERROR_IND(dt.rsl_chan_nr, ts_RslLinkID_DCCH(3), ''O));
	/* We expect to receive BSSMAP SAPI N Reject message from the BSC */
	f_exp_sapi_n_reject(3, GSM0808_CAUSE_BSS_NOT_EQUIPPED);

	/* Clean up the connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);

	f_shutdown_helper();
}

/* Check if we get SAPI N Reject due to a SAPI=3 link establishment timeout */
testcase TC_rll_timeout_sapi_n_reject() runs on test_CT {
	var octetstring rnd_data := f_rnd_octstring(16);
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init(1);

	/* MS establishes a SAPI=0 link on DCCH */
	dt := f_est_dchan(f_rnd_ra_cs(), 23, rnd_data);

	/* MSC sends some data on (not yet established) SAPI=3 link */
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSAP_DTAP(rnd_data, '03'O)));
	/* BSC attempts to establish a SAPI=3 link on DCCH */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_EST_REQ(dt.rsl_chan_nr, tr_RslLinkID_DCCH(3)));

	/* MS does not respond, so the link establishment timeout triggers SAPI N Reject */
	f_exp_sapi_n_reject(3, GSM0808_CAUSE_BSS_NOT_EQUIPPED, T_val := 8.0);

	/* Clean up the connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false);

	f_shutdown_helper();
}

testcase TC_si_default() runs on test_CT {
	f_init(0);
	f_init_bts_and_check_sysinfo(0, expect_si := SystemInformationConfig_default);
	f_shutdown_helper();
}

/* We're testing SI2quater with lists of EARFCNs. Instead of just incrementing EARFCNs, also pick some from the edges of
 * the entire value range. This function provides the same EARFCN numbers for the same earfcn_index  */
private function f_test_si2quater_earfcn_by_idx(integer earfcn_index) return uint16_t
{
	select (earfcn_index) {
	case (0) {
		/* E-ARFCN 111 is already added in the osmo-bsc.cfg */
		return 111;
	}
	case (1) {
		return 1;
	}
	case (2) {
		return 0;
	}
	case (3) {
		return 65535;
	}
	case else {
		return 23 * (earfcn_index - 3);
	}
	}
}

function f_test_si2quater(integer total_earfcns, template SystemInformationConfig expect_si,
			  template CellSelIndValue expect_cells := omit) runs on test_CT {

	f_init(0);

	/* E-ARFCN 111 is already added in the osmo-bsc.cfg, so only add more arfcns if total_earfcns > 1 */
	for (var integer i := 1; i < total_earfcns; i := i + 1) {
		f_bts_0_cfg(BSCVTY, {"si2quater neighbor-list add earfcn " & int2str(f_test_si2quater_earfcn_by_idx(i))
				     & " thresh-hi 20 thresh-lo 10 prio 3 qrxlv 22 meas 3"});
	}

	f_init_bts_and_check_sysinfo(0, expect_si := expect_si);

	f_init(1);

	if (not istemplatekind(expect_cells, "omit")) {
		/* Also check that RR Channel Release contains these EARFCNs.
		 * (copied code from TC_chan_rel_hard_clear_csfb) */
		var BSSAP_N_DATA_ind rx_di;
		var DchanTuple dt;

		dt := f_est_dchan('23'O, 23, '00010203040506'O);

		/* Instruct BSC to clear channel */
		var BssmapCause cause := 0;
		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommandCSFB(cause)));

		/* expect Clear Complete from BSC on A */
		BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete)) {
			/* release the SCCP connection */
			BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
		}

		f_expect_chan_rel(0, dt.rsl_chan_nr, expect_rll_rel_req := false, is_csfb := true,
				  csfb_expect_cells := expect_cells);
	}

	for (var integer i := 1; i < total_earfcns; i := i + 1) {
		f_bts_0_cfg(BSCVTY, {"si2quater neighbor-list del earfcn " & int2str(f_test_si2quater_earfcn_by_idx(i))});
	}
}

private function f_tr_si2quater_earfcns(integer count) return template SI2quaterRestOctetsList
{
	var template SI2quaterRestOctetsList si2quater := {};
	var integer si2quater_count := (count + 2) / 3;

	for (var integer i := 0; i < count; i := i + 1) {
		var integer earfcn := f_test_si2quater_earfcn_by_idx(i);
		var integer index := i / 3;
		var integer earfcn_index := i mod 3;
		if (index >= lengthof(si2quater)) {
			si2quater[index] := tr_SI2quaterRestOctets_EUTRAN(index := index, count := si2quater_count - 1);
		}
		si2quater[index].rel_additions.rel5.rel6.rel7.rel8.prio_eutran_params_desc.desc.eutran_params_desc.desc.repeated_neigh_cells[0].cell_desc_list[earfcn_index] := tr_EUTRAN_CellDesc_default(e_arfcn := earfcn);
	}

	return si2quater;
}

private function f_tr_rr_chan_rel_earfcns(integer count) return template CellSelIndValue
{
	var template CellSelIndValue_EUTRAN_Descrs cells := {};

	/* the lte neighbors must match the config & vty to pass this test */
	for (var integer i := 0; i < count; i := i + 1) {
		var integer earfcn := f_test_si2quater_earfcn_by_idx(i);
		cells[i] := tr_CellSelIndValue_EUTRAN_Descr(earfcn, '1'B, 3);
	}

	return tr_CellSelIndValue_EUTRAN(cells);
}

private function f_tc_si2quater_n_earfcns(integer n) runs on test_CT
{
	var template SystemInformationConfig sic := SystemInformationConfig_default;
        sic.si2quater := f_tr_si2quater_earfcns(n);
	var template CellSelIndValue cells := f_tr_rr_chan_rel_earfcns(n);
	f_test_si2quater(n, sic, cells);
}

testcase TC_si2quater_2_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(2);
	f_shutdown_helper();
}

testcase TC_si2quater_3_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(3);
	f_shutdown_helper();
}

testcase TC_si2quater_4_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(4);
	f_shutdown_helper();
}

testcase TC_si2quater_5_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(5);
	f_shutdown_helper();
}

testcase TC_si2quater_6_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(6);
	f_shutdown_helper();
}

testcase TC_si2quater_12_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(12);
	f_shutdown_helper();
}

testcase TC_si2quater_23_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(23);
	f_shutdown_helper();
}

testcase TC_si2quater_32_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(32);
	f_shutdown_helper();
}

testcase TC_si2quater_33_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(33);
	f_shutdown_helper();
}

testcase TC_si2quater_42_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(42);
	f_shutdown_helper();
}

testcase TC_si2quater_48_earfcns() runs on test_CT {
	f_tc_si2quater_n_earfcns(48);
	f_shutdown_helper();
}

/* verify the VTY error response when adding too many EARFCNs, and showing that osmo-bsc still sends 16 SI2quater with
 * 48 EARFCNs. */
testcase TC_si2quater_49_earfcns() runs on test_CT {
	var template SystemInformationConfig sic := SystemInformationConfig_default;
	sic.si2quater := f_tr_si2quater_earfcns(48); /* 48, not 49! */
	f_init(0);

	for (var integer i := 1; i < 48; i := i + 1) {
		f_bts_0_cfg(BSCVTY, {"si2quater neighbor-list add earfcn " & int2str(f_test_si2quater_earfcn_by_idx(i))
				     & " thresh-hi 20 thresh-lo 10 prio 3 qrxlv 22 meas 3"});
	}

	/* The 49th EARFCN no longer fits, expect VTY error */
	f_vty_enter_cfg_bts(BSCVTY, 0);
	var charstring vty_error;
	vty_error := f_vty_transceive_ret(BSCVTY,
		"si2quater neighbor-list add earfcn 70 thresh-hi 20 thresh-lo 10 prio 3 qrxlv 22 meas 3")
	f_vty_transceive(BSCVTY, "end");

	if (f_strstr(vty_error, "Unable to add ARFCN 70") >= 0) {
		log("Got expected VTY error: ", vty_error);
		setverdict(pass);
	} else {
		setverdict(fail, "Expected the 49th EUTRAN ARFCN to be rejected by vty config, got: ", vty_error);
	}

	f_init_bts_and_check_sysinfo(0, expect_si := sic);

	for (var integer i := 1; i < 48; i := i + 1) {
		f_bts_0_cfg(BSCVTY, {"si2quater neighbor-list del earfcn " & int2str(f_test_si2quater_earfcn_by_idx(i))});
	}
	f_shutdown_helper();
}

private function f_acc09_count_allowed(AccessControlClass acc) return uint8_t
{
	var uint8_t count := 0;
	for (var integer i := 5; i < 16; i := i + 1) {
		if (acc[i] == '0'B) { /* the list marks barred, we count allowed */
			count := count + 1;
		}
	}
	return count;
}

private function f_recv_next_si1(integer rsl_idx := 0) runs on test_CT return SystemInformationType1
{
	var ASP_RSL_Unitdata rx_rsl_ud;
	var SystemInformationType1 last_si1;

	timer T := 30.0;
	T.start;
	alt {
	[] IPA_RSL[rsl_idx].receive(tr_ASP_RSL_UD((tr_RSL_NO_BCCH_INFO,
						   tr_RSL_BCCH_INFO,
						   tr_RSL_NO_SACCH_FILL,
						   tr_RSL_SACCH_FILL))
				   ) -> value rx_rsl_ud {
		f_sysinfo_seen(rsl_idx, rx_rsl_ud.rsl);
		if (g_system_information[rsl_idx].si1 == omit) {
			repeat;
		}
		last_si1 := g_system_information[rsl_idx].si1;
		g_system_information[rsl_idx].si1 := omit;
		T.stop;
		}
	[] T.timeout { setverdict(fail, "Timeout receiving next SI1"); }
	}
	return last_si1;
}

/* verify ACC rotate feature */
testcase TC_si_acc_rotate() runs on test_CT {
	var template SystemInformationConfig sic := SystemInformationConfig_default;
	var SystemInformationType1 last_si1;
	var AccessControlClass acc;
	var uint8_t count;
	var integer times_allowed[10] := { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

	f_init(0, guard_timeout := 60.0);

	f_bts_0_cfg(BSCVTY, {"rach access-control-class 5 barred",
			     "access-control-class-rotate 3",
			     "access-control-class-rotate-quantum 1"});

	/* Init and get first sysinfo */
	f_init_bts_and_check_sysinfo(0, expect_si := ?);

	for (var integer i:= 0; i < 20; i := i + 1) {
		last_si1 := f_recv_next_si1(0);
		acc := last_si1.rach_control.acc;
		count := f_acc09_count_allowed(acc);
		log("RSL: GOT SI1 ACC len=", count, ": ", acc);

		if (count != 3) {
			log("RSL: EXPECTED SI ACC len=3");
			setverdict(fail, "received SI does not match expectations");
			break;
		}

		for (var integer j := 0; j < 10; j := j + 1) {
			if (acc[16 - 1 - j] == '0'B) { /* the list marks barred, we count allowed */
				times_allowed[j] := times_allowed[j] + 1;
			}
		}
	}

	for (var integer j := 0; j < 10; j := j + 1) {
		log("ACC", j, " allowed ", times_allowed[j], " times" );
		if (j != 5 and times_allowed[j] < 3) {
			setverdict(fail, "ACC", j, " ERROR: allowed ", times_allowed[j], " < 1 times");
		} else if (j == 5 and times_allowed[j] > 0) {
			setverdict(fail, "ACC", j, " ERROR: allowed ", times_allowed[j], " > 0 times");
		}
	}

	f_bts_0_cfg(BSCVTY, {"access-control-class-rotate 10",
			     "rach access-control-class 5 allowed"});
	f_shutdown_helper();
}

/* verify ACC startup ramp+rotate feature */
testcase TC_si_acc_ramp_rotate() runs on test_CT {
	var template SystemInformationConfig sic := SystemInformationConfig_default;
	var SystemInformationType1 last_si1;
	var AccessControlClass acc;
	var ASP_RSL_Unitdata rx_rsl_ud;
	var uint8_t count;
	var uint8_t prev_count;
	var integer times_allowed[10] := { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

	f_init(0, guard_timeout := 80.0);

	f_bts_0_cfg(BSCVTY, {"rach access-control-class 4 barred",
			     "access-control-class-rotate 0",
			     "access-control-class-rotate-quantum 1",
			     "access-control-class-ramping",
			     "access-control-class-ramping-step-interval 5",
			     "access-control-class-ramping-step-size 5"});

	/* Init and get first sysinfo */
	f_init_bts_and_check_sysinfo(0, expect_si := ?);
	last_si1 := g_system_information[0].si1;
	acc := last_si1.rach_control.acc;
	count := f_acc09_count_allowed(acc);
	/* Adm subset size was set to 0 above, so wait until all ACC are barred */
	while (count > 0) {
		last_si1 := f_recv_next_si1(0);
		acc := last_si1.rach_control.acc;
		count := f_acc09_count_allowed(acc);
		log("RSL: wait len()=0: GOT SI1 ACC len=", count, ": ", acc);
	}

	/* Increase adm subset size, we should see ramping start up */
	f_bts_0_cfg(BSCVTY, {"access-control-class-rotate 10"});
	prev_count := 0;
	while (true) {
		last_si1 := f_recv_next_si1(0);
		acc := last_si1.rach_control.acc;
		count := f_acc09_count_allowed(acc);
		log("RSL: GOT SI1 ACC len=", count, ": ", acc);

		if (prev_count > count) {
			setverdict(fail, "ACC allowed count dropped while expecting grow: ", prev_count, " -> ", count);
			break;
		}

		if (count == 9) {
			break; /* Maximum reached (10 - 1 perm barred), done here */
		}

		prev_count := count;
	}

	setverdict(pass);

	f_bts_0_cfg(BSCVTY, {"access-control-class-rotate 10",
			     "rach access-control-class 4 allowed",
			     "no access-control-class-ramping"});
	f_shutdown_helper();
}

testcase TC_ctrl_msc_connection_status() runs on test_CT {
	var charstring ctrl_resp;

	f_init(1);

	/* See https://osmocom.org/issues/2729 */
	f_ctrl_get_exp(IPA_CTRL, "msc_connection_status", "connected");
	f_shutdown_helper();
}

testcase TC_ctrl_msc0_connection_status() runs on test_CT {
	var charstring ctrl_resp;

	f_init(1);

	f_ctrl_get_exp(IPA_CTRL, "msc.0.connection_status", "connected");
	f_shutdown_helper();
}

testcase TC_ctrl() runs on test_CT {
	var charstring ctrl_resp;

	f_init(1);

	/* all below values must match the osmo-bsc.cfg config file used */

	f_ctrl_get_exp(IPA_CTRL, "mcc", "001");
	f_ctrl_get_exp(IPA_CTRL, "mnc", "01");
	f_ctrl_get_exp(IPA_CTRL, "number-of-bts", "4");

	var integer bts_nr := 0;
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "location-area-code", "1");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "cell-identity", "0");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "oml-connection-state", "connected");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "gprs-mode", "gprs");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "rf_state", "operational,unlocked,on");
	f_ctrl_get_exp_trx(IPA_CTRL, bts_nr, 0, "arfcn", "871");
	f_ctrl_get_exp_trx(IPA_CTRL, bts_nr, 0, "max-power-reduction", "20");

	var integer uptime := str2int(f_ctrl_get_bts(IPA_CTRL, bts_nr, "oml-uptime"));
	f_sleep(2.0);
	if (str2int(f_ctrl_get_bts(IPA_CTRL, bts_nr, "oml-uptime")) < uptime+1) {
		setverdict(fail, "oml-uptime not incrementing as expected");
	}
	/* TODO: Disconnect RSL, imply that OML is disconnected and check for uptime zero? */

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bsc", 0, "paging:attempted", 0);

	f_shutdown_helper();
}

/* Verify that Upon receival of SET "location", BSC forwards a TRAP
  "location-state" over the SCCPlite IPA conn */
testcase TC_ctrl_location() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var integer bts_nr := 0;

	f_init(1, true);
	f_sleep(1.0);

	f_ctrl_set_bts(IPA_CTRL, bts_nr, "location", "1234567,fix3d,0.340000,0.560000,0.780000");
	f_ctrl_exp_trap(SCCPLITE_IPA_CTRL, "bts." & int2str(bts_nr) & ".location-state",
			"1234567,fix3d,0.340000,0.560000,0.780000,operational,unlocked,on,001,01");

	f_ctrl_set(SCCPLITE_IPA_CTRL, "rf_locked", "1");
	f_sleep(2.0);

	f_ctrl_set_bts(IPA_CTRL, bts_nr, "location", "1234888,fix3d,0.350000,0.570000,0.790000");
	f_ctrl_exp_trap(SCCPLITE_IPA_CTRL, "bts." & int2str(bts_nr) & ".location-state",
			"1234888,fix3d,0.350000,0.570000,0.790000,operational,locked,off,001,01");

	/* should match the one from  config */
	f_ctrl_set(SCCPLITE_IPA_CTRL, "rf_locked", "0");

	f_shutdown_helper();
}


/***********************************************************************
 * Paging Testing
 ***********************************************************************/

type record Cell_Identity {
	GsmMcc		mcc,
	GsmMnc		mnc,
	GsmLac		lac,
	GsmCellId	ci
};
private const Cell_Identity cid := { '001'H, '01'H, 1, 0 };
private const Cell_Identity unknown_cid := { '678'H, 'f90'H, 1, 0 };

type set of integer BtsIdList;

private function f_bts_in_list(integer bts_id, BtsIdList bts_ids) return boolean {
	for (var integer j := 0; j < sizeof(bts_ids); j := j + 1) {
		if (bts_id == bts_ids[j]) {
			return true;
		}
	}
	return false;
}

/* core paging test helper function; used by most paging test cases */
private function f_pageing_helper(hexstring imsi,
				  template BSSMAP_FIELD_CellIdentificationList cid_list,
				  BtsIdList bts_ids := { 0 },
				  template RSL_ChanNeeded rsl_chneed := omit,
				  template (omit) OCT4 tmsi := omit) runs on test_CT
{
	var template BSSMAP_IE_ChannelNeeded bssmap_chneed;
	var template MobileIdentityV mi;
	var RSL_Message rx_rsl;
	var integer paging_group := hex2int(imsi[lengthof(imsi)-1]);
	var integer i;

	f_init();

	/* Clear the queue, it might still contain stuff like BCCH FILLING */
	for (i := 0; i < NUM_BTS; i := i + 1) {
		IPA_RSL[i].clear;
	}

	if (isvalue(rsl_chneed)) {
		/* The values of 08.08 3.2.2.36 and 08.58 9.3.40 are luckily identical */
		bssmap_chneed := ts_BSSMAP_IE_ChanNeeded(int2bit(enum2int(valueof(rsl_chneed)),2));
	} else {
		bssmap_chneed := omit;
	}

	BSSAP.send(ts_BSSAP_UNITDATA_req(g_bssap[0].sccp_addr_peer, g_bssap[0].sccp_addr_own,
					 ts_BSSMAP_Paging(imsi, cid_list, tmsi, bssmap_chneed)));

	if (not istemplatekind(tmsi, "omit")) {
		mi := t_MI_TMSI(tmsi);
	} else {
		mi := tr_MI_IMSI(imsi);
	}

	for (i := 0; i < sizeof(bts_ids); i := i + 1) {
		rx_rsl := f_exp_ipa_rx(bts_ids[i], tr_RSL_PAGING_CMD(mi));
		/* check channel type, paging group */
		if (rx_rsl.ies[1].body.paging_group != paging_group) {
			setverdict(fail, "Paging for wrong paging group");
		}
		if (ispresent(rsl_chneed) and
		    rx_rsl.ies[3].body.chan_needed.chan_needed != valueof(rsl_chneed)) {
			setverdict(fail, "RSL Channel Needed != BSSMAP Channel Needed");
		}
	}
	f_sleep(2.0);
	/* do a quick check on all not-included BTSs if they received paging */
	for (i := 0; i < NUM_BTS; i := i + 1) {
		timer T := 0.1;
		if (f_bts_in_list(i, bts_ids)) {
			continue;
		}
		T.start;
		alt {
		[] IPA_RSL[i].receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD(mi))) {
			setverdict(fail, "Paging on BTS ", i, " which is not part of ", bts_ids);
			}
		[] IPA_RSL[i].receive { repeat; }
		[] T.timeout { }
		}
	}

	setverdict(pass);
}

const BtsIdList c_BtsId_all := { 0, 1, 2 };
const BtsIdList c_BtsId_none := { };
const BtsIdList c_BtsId_LAC1 := { 0, 1 };
const BtsIdList c_BtsId_LAC2 := { 2 };

/* PAGING by IMSI + TMSI */
testcase TC_paging_imsi_nochan() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000001'H, cid_list, c_BtsId_all, omit, omit);
	f_shutdown_helper();
}

/* PAGING by IMSI + TMSI */
testcase TC_paging_tmsi_nochan() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000001'H, cid_list, c_BtsId_all, omit, 'A1B2C301'O);
	f_shutdown_helper();
}

/* Paging with different "channel needed' values */
testcase TC_paging_tmsi_any() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000002'H, cid_list, c_BtsId_all, RSL_CHANNEED_ANY, 'A1B2C302'O);
	f_shutdown_helper();
}
testcase TC_paging_tmsi_sdcch() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000003'H, cid_list, c_BtsId_all, RSL_CHANNEED_SDCCH, 'A1B2C303'O);
	f_shutdown_helper();
}
testcase TC_paging_tmsi_tch_f() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010000000004'H, cid_list, c_BtsId_all, RSL_CHANNEED_TCH_F, 'A1B2C304'O);
	f_shutdown_helper();
}
testcase TC_paging_tmsi_tch_hf() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010000000005'H, cid_list, c_BtsId_all, RSL_CHANNEED_TCH_ForH, 'A1B2C305'O);
	f_shutdown_helper();
}

/* Paging by CGI */
testcase TC_paging_imsi_nochan_cgi() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_CGI := { ts_BSSMAP_CI_CGI(cid.mcc, cid.mnc, cid.lac, cid.ci) } };
	f_pageing_helper('001010000000006'H, cid_list, { 0 });
	f_shutdown_helper();
}

/* Paging by LAC+CI */
testcase TC_paging_imsi_nochan_lac_ci() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC_CI := { ts_BSSMAP_CI_LAC_CI(cid.lac, cid.ci) } };
	f_pageing_helper('001010000000007'H, cid_list, { 0 });
	f_shutdown_helper();
}

/* Paging by CI */
testcase TC_paging_imsi_nochan_ci() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_CI := { ts_BSSMAP_CI_CI(cid.ci) } };
	f_pageing_helper('001010000000008'H, cid_list, { 0 });
	f_shutdown_helper();
}

/* Paging by LAI */
testcase TC_paging_imsi_nochan_lai() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAI := { ts_BSSMAP_CI_LAI(cid.mcc, cid.mnc, cid.lac) } };
	f_pageing_helper('001010000000009'H, cid_list, c_BtsId_LAC1);
	f_shutdown_helper();
}

/* Paging by LAC */
testcase TC_paging_imsi_nochan_lac() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC := { ts_BSSMAP_CI_LAC(cid.lac) } };
	f_pageing_helper('001010000000010'H, cid_list, c_BtsId_LAC1);
	f_shutdown_helper();
}

/* Paging by "all in BSS" */
testcase TC_paging_imsi_nochan_all() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_allInBSS := ''O };
	f_pageing_helper('001010000000011'H, cid_list, c_BtsId_all);
	f_shutdown_helper();
}

/* Paging by PLMN+LAC+RNC; We do not implement this; Verify nothing is paged */
testcase TC_paging_imsi_nochan_plmn_lac_rnc() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_PLMN_LAC_RNC := { ts_BSSMAP_CI_PLMN_LAC_RNC(cid.mcc, cid.mnc, cid.lac, 12) } };
	f_pageing_helper('001010000000012'H, cid_list, c_BtsId_none);
	f_shutdown_helper();
}

/* Paging by RNC; We do not implement this; Verify nothing is paged */
testcase TC_paging_imsi_nochan_rnc() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_RNC := { int2oct(13, 2) } };
	f_pageing_helper('001010000000013'H, cid_list, c_BtsId_none);
	f_shutdown_helper();
}

/* Paging by LAC+RNC; We do not implement; Verify nothing is paged */
testcase TC_paging_imsi_nochan_lac_rnc() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC_RNC := { ts_BSSMAP_CI_LAC_RNC(cid.lac, 14) } };
	f_pageing_helper('001010000000014'H, cid_list, c_BtsId_none);
	f_shutdown_helper();
}

/* Paging on multiple cells (multiple entries in list): Verify all of them page */
testcase TC_paging_imsi_nochan_lacs() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC := { ts_BSSMAP_CI_LAC(1), ts_BSSMAP_CI_LAC(2) } };
	f_pageing_helper('001010000000015'H, cid_list, c_BtsId_all);
	f_shutdown_helper();
}

/* Paging on empty list: Verify none of them page */
testcase TC_paging_imsi_nochan_lacs_empty() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC := { } };
	f_pageing_helper('001010000000016'H, cid_list, c_BtsId_none);
	f_shutdown_helper();
}

/* Paging by CGI with unknown MCC/MNC: Verify nothing is paged. */
testcase TC_paging_imsi_nochan_cgi_unknown_cid() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_CGI := { ts_BSSMAP_CI_CGI(unknown_cid.mcc, unknown_cid.mnc, unknown_cid.lac, unknown_cid.ci) } };
	f_pageing_helper('001010000000006'H, cid_list, c_BtsId_none);
	f_shutdown_helper();
}

/* Verify paging retransmission interval + count */
/* Verify paging stops after channel establishment */
/* Test behavior under paging overload */

/* Verify PCH load */
testcase TC_paging_imsi_load() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	timer T := 4.0;
	timer T_retrans := 1.0;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010123456789'H, cid_list, c_BtsId_all);

	/* tell BSC there is no paging space anymore */
	f_ipa_tx(0, ts_RSL_PAGING_LOAD_IND(0));
	f_sleep(0.2);
	IPA_RSL[0].clear;

	/* Wait for 4 seconds if any more PAGING CMD are received on RSL. Normally,
	 * there would be 8 retransmissions during 4 seconds */
	T.start;
	T_retrans.start;
	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after LOAD_IND(0)");
		mtc.stop;
		}
	[] T_retrans.timeout {
		/* re-trnsmit the zero-space LOAD IND to avoid BSC 'auto credit' */
		f_ipa_tx(0, ts_RSL_PAGING_LOAD_IND(0));
		T_retrans.start;
		repeat;
		}
	[] T.timeout {
		setverdict(pass);
		}
	}

	f_shutdown_helper();
}

/* Verify Paging Counter */
testcase TC_paging_counter() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	timer T := 4.0;
	var integer i;
	var integer paging_attempted_bsc;
	var integer paging_attempted_bts[NUM_BTS];
	var integer paging_expired_bts[NUM_BTS];
	cid_list := valueof(ts_BSSMAP_CIL_noCell);

	f_init();

	/* read counters before paging */
	paging_attempted_bsc := f_ctrl_get_ratectr_abs(IPA_CTRL, "bsc", 0, "paging:attempted");
	for (i := 0; i < NUM_BTS; i := i+1) {
		paging_attempted_bts[i] := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", i, "paging:attempted");
		paging_expired_bts[i] := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", i, "paging:expired");
	}

	f_pageing_helper('001230000000001'H, cid_list, c_BtsId_all);

	/* expect the attempted pages on BSC and each BTSs to have incremented by one */
	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bsc", 0, "paging:attempted", paging_attempted_bsc+1);
	for (i := 0; i < NUM_BTS; i := i+1) {
		f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", i, "paging:attempted",
						paging_attempted_bts[i]+1);
	}

	/* assume that 12s later the paging on all BTSs have expired and hence incremented by 1 */
	f_sleep(12.0);
	for (i := 0; i < NUM_BTS; i := i+1) {
		f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", i, "paging:expired",
						paging_expired_bts[i]+1);
	}

	f_shutdown_helper();
}


/* Verify paging stops after A-RESET */
testcase TC_paging_imsi_a_reset() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	timer T := 3.0;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010123456789'H, cid_list, c_BtsId_all);

	/* Perform a BSSMAP Reset and wait for ACK */
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_bssap[0].sccp_addr_peer, g_bssap[0].sccp_addr_own, ts_BSSMAP_Reset(0, g_osmux_enabled)));
	alt {
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(g_bssap[0].sccp_addr_own, g_bssap[0].sccp_addr_peer, tr_BSSMAP_ResetAck(g_osmux_enabled))) { }
	[] BSSAP.receive { repeat; }
	}

	/* Wait to avoid a possible race condition if a paging message is
	 * received right before the reset ACK. */
	f_sleep(0.2);

	/* Clear the queue, it might still contain stuff like BCCH FILLING */
	for (var integer i := 0; i < sizeof(IPA_RSL); i := i+1) {
		IPA_RSL[i].clear;
	}

	/* Wait for 3 seconds if any more PAGING CMD are received on RSL */
	T.start;
	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after A-RESET");
		mtc.stop;
		}
	[] IPA_RSL[1].receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after A-RESET");
		mtc.stop;
		}
	[] IPA_RSL[2].receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after A-RESET");
		mtc.stop;
		}
	[] T.timeout {
		setverdict(pass);
		}
	}

	f_shutdown_helper();
}

/* Verify how we handle unsolicited Paging Response. In case of an unsolicit
 * paging response we can not know which MSC is in charge, so we will blindly
 * pick the first configured MSC. This behavior is required in order to make
 * MT-CSFB calls working because in those cases the BSC can not know that the
 * MSC has already paged the subscriver via SGs. So any MT-CSFB call will look
 * like an unsolicited Paging Response to the MSC.
 */
testcase TC_paging_resp_unsol() runs on test_CT {

	f_init(1);
	timer T := 5.0;

	var BSSAP_N_CONNECT_ind rx_c_ind;
	var DchanTuple dt;
	var PDU_ML3_MS_NW l3 := valueof(ts_PAG_RESP(valueof(ts_MI_IMSI_LV('001010008880018'H))));
	var octetstring rr_pag_resp := enc_PDU_ML3_MS_NW(l3);

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	dt.rsl_chan_nr := f_chreq_act_ack();

	/* Send unsolicited Paging response (no matching Paging CMD stored in BSC) */
	f_ipa_tx(0, ts_RSL_EST_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0)), enc_PDU_ML3_MS_NW(l3)));


	/* Expevct a CR with a matching Paging response on the A-Interface */
	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(rr_pag_resp))) {
		setverdict(pass);
		}
	[] BSSAP.receive {
		setverdict(fail, "Received unexpected message on A-Interface!");
		}
	[] T.timeout {
		setverdict(fail, "Received nothing on A-Interface!");
		}
	}

	f_shutdown_helper();
}

/* Test RSL link drop causes counter increment */
testcase TC_rsl_drop_counter() runs on test_CT {
	var integer rsl_fail;

	f_init(1);

	rsl_fail := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "rsl_fail");

	bts[0].rsl.vc_IPA.stop;

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "rsl_fail", rsl_fail+1);

	f_shutdown_helper();
}

/* TODO: Test OML link drop causes counter increment */

/* The body of TC_rsl_unknown_unit_id() and TC_oml_unknown_unit_id() tests. */
function f_ipa_unknown_unit_id(integer mp_bsc_ipa_port) runs on test_CT return boolean {
	timer T := 10.0;

	bts[0].rsl.id := "IPA-0-RSL";
	bts[0].rsl.vc_IPA := IPA_Emulation_CT.create(bts[0].rsl.id & "-IPA");
	bts[0].rsl.ccm_pars := c_IPA_default_ccm_pars;
	bts[0].rsl.ccm_pars.name := "Osmocom TTCN-3 BTS Simulator";
	bts[0].rsl.ccm_pars.unit_id := "99/0/0"; /* value which is unknown at BTS */

	f_ipa_ctrl_start(mp_bsc_ip, mp_bsc_ctrl_port);

	f_init_mgcp("VirtMSC");

	/* start RSL/OML connection (XXX re-uses RSL port/protocol definitions for OML) */
	map(bts[0].rsl.vc_IPA:IPA_PORT, system:IPA);
	connect(bts[0].rsl.vc_IPA:IPA_RSL_PORT, self:IPA_RSL[0]);
	bts[0].rsl.vc_IPA.start(IPA_Emulation.main_client(mp_bsc_ip, mp_bsc_ipa_port, "", 10000, bts[0].rsl.ccm_pars));

	/* wait for IPA OML link to connect and then disconnect */
	T.start;
	alt {
	[] IPA_RSL[0].receive(tr_ASP_IPA_EV(ASP_IPA_EVENT_DOWN)) {
		T.stop;
		return true;
	}
	[] IPA_RSL[0].receive { repeat }
	[] T.timeout {
		return false;
		}
	}
	return false;
}

/* BSC should close an RSL connection from a BTS with unknown unit ID (OS#2714). */
testcase TC_rsl_unknown_unit_id() runs on test_CT {
	if (f_ipa_unknown_unit_id(mp_bsc_rsl_port)) {
		setverdict(pass);
	} else {
		setverdict(fail, "Timeout RSL waiting for connection to close");
	}
	f_shutdown_helper();
}


/* BSC should close an RSL connection from a BTS with unknown unit ID (OS#2714). */
testcase TC_oml_unknown_unit_id() runs on test_CT {
	if (f_ipa_unknown_unit_id(mp_bsc_oml_port)) {
		setverdict(pass);
	} else {
		setverdict(fail, "Timeout OML waiting for connection to close");
	}
	f_shutdown_helper();
}


/***********************************************************************
 * "New world" test cases using RSL_Emulation + RAN_Emulation
 ***********************************************************************/

import from RAN_Emulation all;
import from BSSAP_LE_Emulation all;
import from RSL_Emulation all;
import from MSC_ConnectionHandler all;

type function void_fn(charstring id) runs on MSC_ConnHdlr;

/* helper function to create and connect a MSC_ConnHdlr component */
private function f_connect_handler(inout MSC_ConnHdlr vc_conn, integer bssap_idx := 0) runs on test_CT {
	connect(vc_conn:RAN, g_bssap[bssap_idx].vc_RAN:PROC);
	connect(vc_conn:MGCP_PROC, vc_MGCP:MGCP_PROC);
	connect(vc_conn:RSL, bts[0].rsl.vc_RSL:CLIENT_PT);
	connect(vc_conn:RSL_PROC, bts[0].rsl.vc_RSL:RSL_PROC);
	if (isvalue(bts[1])) {
		connect(vc_conn:RSL1, bts[1].rsl.vc_RSL:CLIENT_PT);
		connect(vc_conn:RSL1_PROC, bts[1].rsl.vc_RSL:RSL_PROC);
	}
	if (isvalue(bts[2])) {
		connect(vc_conn:RSL2, bts[2].rsl.vc_RSL:CLIENT_PT);
		connect(vc_conn:RSL2_PROC, bts[2].rsl.vc_RSL:RSL_PROC);
	}
	connect(vc_conn:BSSAP, g_bssap[bssap_idx].vc_RAN:CLIENT);
	if (mp_enable_lcs_tests) {
		connect(vc_conn:BSSAP_LE, g_bssap_le.vc_BSSAP_LE:CLIENT);
		connect(vc_conn:BSSAP_LE_PROC, g_bssap_le.vc_BSSAP_LE:PROC);
	}
	connect(vc_conn:MGCP, vc_MGCP:MGCP_CLIENT);
	connect(vc_conn:MGCP_MULTI, vc_MGCP:MGCP_CLIENT_MULTI);
	connect(vc_conn:STATSD_PROC, vc_STATSD:STATSD_PROC);
}

function f_start_handler(void_fn fn, template (omit) TestHdlrParams pars := omit)
runs on test_CT return MSC_ConnHdlr {
	var charstring id := testcasename();
	var MSC_ConnHdlr vc_conn;
	var integer bssap_idx := 0;
	if (isvalue(pars)) {
		bssap_idx := valueof(pars).mscpool.bssap_idx;
	}
	vc_conn := MSC_ConnHdlr.create(id);
	f_connect_handler(vc_conn, bssap_idx);
	/* Emit a marker to appear in the SUT's own logging output */
	f_logp(BSCVTY, testcasename() & "() start");
	vc_conn.start(f_handler_init(fn, id, pars));
	return vc_conn;
}

/* first function inside ConnHdlr component; sets g_pars + starts function */
private function f_handler_init(void_fn fn, charstring id, template (omit) TestHdlrParams pars := omit)
runs on MSC_ConnHdlr {
	if (isvalue(pars)) {
		g_pars := valueof(pars);
	}
	fn.apply(id);
}

/* Establish signalling channel (non-assignment case) followed by cipher mode */
private function f_tc_ciph_mode_a5(charstring id) runs on MSC_ConnHdlr {
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelTypeSIGNAL);
	ass_cmd.pdu.bssmap.assignmentRequest.circuitIdentityCode := omit;
	ass_cmd.pdu.bssmap.assignmentRequest.aoIPTransportLayer := omit;
	exp_compl.pdu.bssmap.assignmentComplete.circuitIdentityCode := omit;
	exp_compl.pdu.bssmap.assignmentComplete.aoIPTransportLayer := omit;

	f_establish_fully(ass_cmd, exp_compl);
}
testcase TC_ciph_mode_a5_0() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.encr := valueof(t_EncrParams('01'O, f_rnd_octstring(8)));

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_ciph_mode_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}
testcase TC_ciph_mode_a5_1() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.encr := valueof(t_EncrParams('02'O, f_rnd_octstring(8)));

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_ciph_mode_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}
testcase TC_ciph_mode_a5_3() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.encr := valueof(t_EncrParams('08'O, f_rnd_octstring(8)));

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_ciph_mode_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* establish initial channel, enable ciphering followed by assignment to ciphered channel */
private function f_tc_assignment_aoip_tla_v6(charstring id) runs on MSC_ConnHdlr {
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req(aoip_tla := "::3");
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));

	f_establish_fully(ass_cmd, exp_compl);
}
testcase TC_assignment_aoip_tla_v6() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_assignment_aoip_tla_v6), pars);
	vc_conn.done;
	f_shutdown_helper();
}


/* establish initial channel, enable ciphering followed by assignment to ciphered channel */
private function f_tc_assignment_fr_a5(charstring id) runs on MSC_ConnHdlr {
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();

	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));

	f_establish_fully(ass_cmd, exp_compl);
}
testcase TC_assignment_fr_a5_0() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.encr := valueof(t_EncrParams('01'O, f_rnd_octstring(8)));

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_assignment_fr_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}
testcase TC_assignment_fr_a5_1() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.encr := valueof(t_EncrParams('02'O, f_rnd_octstring(8)));

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_assignment_fr_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}
testcase TC_assignment_fr_a5_3() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.encr := valueof(t_EncrParams('08'O, f_rnd_octstring(8)));

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_assignment_fr_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* Expect ASSIGNMENT FAIL if mandatory IE is missing */
private function f_tc_assignment_fr_a5_1_codec_missing(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var template PDU_BSSAP exp_fail := tr_BSSMAP_AssignmentFail;
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	const OCT8 kc := '0001020304050607'O;

	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	/* Omit: ass_cmd.pdu.bssmap.assignmentRequest.codecList */

	f_establish_fully(ass_cmd, exp_fail);
}
testcase TC_assignment_fr_a5_1_codec_missing() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_tc_assignment_fr_a5_1_codec_missing));
	vc_conn.done;
	f_shutdown_helper();
}

private function f_tc_assignment_fr_a5_4(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	const OCT8 kc := '0001020304050607'O;
	const OCT16 kc128 := kc & kc;

	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	f_establish_fully(ass_cmd, exp_compl);
	f_cipher_mode('10'O, kc, kc128, true);
	/* TODO: expect GSM0808_CAUSE_CIPHERING_ALGORITHM_NOT_SUPPORTED cause value */
}
testcase TC_assignment_fr_a5_4() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_tc_assignment_fr_a5_4));
	vc_conn.done;
	f_shutdown_helper();
}


private function f_tc_assignment_sign(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var template PDU_BSSAP exp_compl := tr_BSSMAP_AssignmentComplete(omit, omit);
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelTypeSIGNAL);

	f_statsd_reset();
	f_establish_fully(ass_cmd, exp_compl);

	var StatsDExpects expect := {
		{ name := "TTCN3.bts.0.chreq.total", mtype := "c", min := 1, max := 1},
		{ name := "TTCN3.bts.0.chreq.successful", mtype := "c", min := 1, max := 1},
		{ name := "TTCN3.bsc.0.assignment.attempted", mtype := "c", min := 1, max := 1},
		{ name := "TTCN3.bsc.0.assignment.completed", mtype := "c", min := 1, max := 1}
	};
	f_statsd_expect(expect);
}

testcase TC_assignment_sign() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_tc_assignment_sign));
	vc_conn.done;
	f_shutdown_helper();
}

/***********************************************************************
 * Codec (list) testing
 ***********************************************************************/

/* check if the given rsl_mode is compatible with the a_elem */
private function f_match_codec(BSSMAP_FIELD_CodecElement a_elem, RSL_IE_ChannelMode rsl_mode)
return boolean {
	select (a_elem.codecType) {
	case (GSM_FR) {
		if (match(rsl_mode, tr_RSL_ChanMode(RSL_CHRT_TCH_F, RSL_CMOD_SP_GSM1))) {
			return true;
		}
	}
	case (GSM_HR) {
		if (match(rsl_mode, tr_RSL_ChanMode(RSL_CHRT_TCH_H, RSL_CMOD_SP_GSM1))) {
			return true;
		}
	}
	case (GSM_EFR) {
		if (match(rsl_mode, tr_RSL_ChanMode(RSL_CHRT_TCH_F, RSL_CMOD_SP_GSM2))) {
			return true;
		}
	}
	case (FR_AMR) {
		if (match(rsl_mode, tr_RSL_ChanMode(RSL_CHRT_TCH_F, RSL_CMOD_SP_GSM3))) {
			return true;
		}
	}
	case (HR_AMR) {
		if (match(rsl_mode, tr_RSL_ChanMode(RSL_CHRT_TCH_H, RSL_CMOD_SP_GSM3))) {
			return true;
		}
	}
	case else { }
	}
	return false;
}

/* check if the given rsl_mode is compatible with the a_list */
private function f_match_codecs(BSSMAP_IE_SpeechCodecList a_list, RSL_IE_ChannelMode rsl_mode)
return boolean {
	for (var integer i := 0; i < sizeof(a_list); i := i+1) {
		if (f_match_codec(a_list.codecElements[i], rsl_mode)) {
			return true;
		}
	}
	return false;
}

/* determine BSSMAP_IE_ChannelType from *first* element of BSSMAP_FIELD_CodecElement */
function f_BSSMAP_chtype_from_codec(BSSMAP_FIELD_CodecElement a_elem)
return BSSMAP_IE_ChannelType {
	/* FIXME: actually look at all elements of BSSMAP_IE_SpeechCodecList */
	var BSSMAP_IE_ChannelType ret := valueof(ts_BSSMAP_IE_ChannelType);
	select (a_elem.codecType) {
	case (GSM_FR) {
		ret.channelRateAndType := ChRate_TCHF;
		ret.speechId_DataIndicator := Spdi_TCHF_FR;
	}
	case (GSM_HR) {
		ret.channelRateAndType := ChRate_TCHH;
		ret.speechId_DataIndicator := Spdi_TCHH_HR;
	}
	case (GSM_EFR) {
		ret.channelRateAndType := ChRate_TCHF;
		ret.speechId_DataIndicator := Spdi_TCHF_EFR;
	}
	case (FR_AMR) {
		ret.channelRateAndType := ChRate_TCHF;
		ret.speechId_DataIndicator := Spdi_TCHF_AMR;
	}
	case (HR_AMR) {
		ret.channelRateAndType := ChRate_TCHH;
		ret.speechId_DataIndicator := Spdi_TCHH_AMR;
	}
	case else {
		setverdict(fail, "Unsupported codec ", a_elem);
		mtc.stop;
	}
	}
	return ret;
}

private function f_rsl_chmod_tmpl_from_codec(BSSMAP_FIELD_CodecElement a_elem)
return template RSL_IE_Body {
	var template RSL_IE_Body mode_ie := {
		chan_mode := {
			len := ?,
			reserved := ?,
			dtx_d := ?,
			dtx_u := ?,
			spd_ind := RSL_SPDI_SPEECH,
			ch_rate_type := -,
			coding_alg_rate := -
		}
	}

	select (a_elem.codecType) {
	case (GSM_FR) {
		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_F;
		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM1;
	}
	case (GSM_HR) {
		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_H;
		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM1;
	}
	case (GSM_EFR) {
		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_F;
		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM2;
	}
	case (FR_AMR) {
		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_F;
		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM3;
	}
	case (HR_AMR) {
		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_H;
		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM3;
	}
	}
	return mode_ie;
}

type record CodecListTest {
	BSSMAP_IE_SpeechCodecList codec_list,
	charstring id
}
type record of CodecListTest CodecListTests

private function f_TC_assignment_codec(charstring id) runs on MSC_ConnHdlr {
	var PDU_BSSAP ass_cmd := f_gen_ass_req(g_pars.use_osmux);
	var template PDU_BSSAP exp_compl := f_gen_exp_compl(g_pars.use_osmux);

	/* puzzle together the ASSIGNMENT REQ for given codec[s] */
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		ass_cmd.pdu.bssmap.assignmentRequest.codecList := g_pars.ass_codec_list;
		exp_compl.pdu.bssmap.assignmentComplete.speechCodec.codecElements[0] :=
								g_pars.ass_codec_list.codecElements[0];
		if (isvalue(g_pars.expect_mr_s0_s7)) {
			exp_compl.pdu.bssmap.assignmentComplete.speechCodec.codecElements[0].s0_7 :=
								g_pars.expect_mr_s0_s7;
		}
	}
	ass_cmd.pdu.bssmap.assignmentRequest.channelType :=
				f_BSSMAP_chtype_from_codec(g_pars.ass_codec_list.codecElements[0]);
	log("expecting ASS COMPL like this: ", exp_compl);

	f_establish_fully(ass_cmd, exp_compl);

	/* Verify that the RSL-side activation actually matches our expectations */
	var RSL_Message rsl := f_rslem_get_last_act(RSL_PROC, 0, g_chan_nr);

	var RSL_IE_Body mode_ie;
	if (f_rsl_find_ie(rsl, RSL_IE_CHAN_MODE, mode_ie) == false) {
		setverdict(fail, "Couldn't find CHAN_MODE IE");
		mtc.stop;
	}
	var template RSL_IE_Body t_mode_ie := f_rsl_chmod_tmpl_from_codec(g_pars.ass_codec_list.codecElements[0]);
	if (not match(mode_ie, t_mode_ie)) {
		setverdict(fail, "RSL Channel Mode IE doesn't match expectation");
	}

	var RSL_IE_Body mr_conf;
	if (g_pars.expect_mr_conf_ie != omit) {
		if (f_rsl_find_ie(rsl, RSL_IE_MR_CONFIG, mr_conf) == false) {
			setverdict(fail, "Missing MR CONFIG IE in RSL Chan Activ");
			mtc.stop;
		}
		log("found RSL MR CONFIG IE: ", mr_conf);

		if (not match(mr_conf, g_pars.expect_mr_conf_ie)) {
			setverdict(fail, "RSL MR CONFIG IE does not match expectation. Expected: ",
				g_pars.expect_mr_conf_ie);
		}
	} else {
		if (f_rsl_find_ie(rsl, RSL_IE_MR_CONFIG, mr_conf) == true) {
			log("found RSL MR CONFIG IE: ", mr_conf);
			setverdict(fail, "Found MR CONFIG IE in RSL Chan Activ, expecting omit");
			mtc.stop;
		}
	}
}

private function f_TC_assignment_codec_fail(charstring id) runs on MSC_ConnHdlr {

	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_fail := tr_BSSMAP_AssignmentFail;

	/* puzzle together the ASSIGNMENT REQ for given codec[s] */
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		ass_cmd.pdu.bssmap.assignmentRequest.codecList := g_pars.ass_codec_list;
	}
	ass_cmd.pdu.bssmap.assignmentRequest.channelType :=
				f_BSSMAP_chtype_from_codec(g_pars.ass_codec_list.codecElements[0]);
	log("expecting ASS FAIL like this: ", exp_fail);

	f_establish_fully(ass_cmd, exp_fail);
}

testcase TC_assignment_codec_fr() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_shutdown_helper();
}

testcase TC_assignment_codec_hr() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecHR}));
	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_shutdown_helper();
}

testcase TC_assignment_codec_efr() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecEFR}));
	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* Allow 5,90k only (current default config) */
private function f_allow_amr_rate_5_90k() runs on test_CT {
	f_vty_enter_cfg_msc(BSCVTY, 0);
	f_vty_transceive(BSCVTY, "amr-config 12_2k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 10_2k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 7_95k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 7_40k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 6_70k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 5_90k allowed");
	f_vty_transceive(BSCVTY, "amr-config 5_15k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 4_75k forbidden");
	f_vty_transceive(BSCVTY, "exit");
	f_vty_transceive(BSCVTY, "exit");
}

/* Allow 4,75k, 5,90k, 4,70k and 12,2k, which are the most common rates
 * ("Config-NB-Code = 1") */
private function f_allow_amr_rate_4_75k_5_90k_7_40k_12_20k() runs on test_CT {
	f_vty_enter_cfg_msc(BSCVTY, 0);
	f_vty_transceive(BSCVTY, "amr-config 12_2k allowed");
	f_vty_transceive(BSCVTY, "amr-config 10_2k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 7_95k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 7_40k allowed");
	f_vty_transceive(BSCVTY, "amr-config 6_70k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 5_90k allowed");
	f_vty_transceive(BSCVTY, "amr-config 5_15k forbidden");
	f_vty_transceive(BSCVTY, "amr-config 4_75k allowed");
	f_vty_transceive(BSCVTY, "exit");
	f_vty_transceive(BSCVTY, "exit");
}

testcase TC_assignment_codec_amr_f() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	/* Note: This setups the codec configuration. The parameter payload in
	 * mr_conf must be consistant with the parameter codecElements in pars
	 * and also must match the amr-config in osmo-bsc.cfg! */
	var RSL_IE_Body mr_conf := {
		other := {
			len := 2,
			payload := '2804'O
		}
	};

	pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_F}));
	pars.ass_codec_list.codecElements[0].s0_7 := '00000100'B; /* 5,90k */
	pars.ass_codec_list.codecElements[0].s8_15 := '01010111'B;
	pars.expect_mr_conf_ie := mr_conf;

	f_init(1, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_h() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	/* See note above */
	var RSL_IE_Body mr_conf := {
		other := {
			len := 2,
			payload := '2804'O
		}
	};

	pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_H}));
	pars.ass_codec_list.codecElements[0].s0_7 := '00000100'B; /* 5,90k */
	pars.ass_codec_list.codecElements[0].s8_15 := '00000111'B;
	pars.expect_mr_conf_ie := mr_conf;

	f_init(1, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_shutdown_helper();
}

function f_TC_assignment_codec_amr(boolean fr, octetstring mrconf, bitstring s8_s0, bitstring exp_s8_s0)
runs on test_CT {

	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	/* See note above */
	var RSL_IE_Body mr_conf := {
		other := {
			len := lengthof(mrconf),
			payload := mrconf
		}
	};

	if (fr) {
		pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_F}));
	} else {
		pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_H}));
	}
	pars.ass_codec_list.codecElements[0].s0_7 := s8_s0;
	pars.ass_codec_list.codecElements[0].s8_15 := '00000111'B;
	pars.expect_mr_conf_ie := mr_conf;
	pars.expect_mr_s0_s7 := exp_s8_s0;

	f_init(1, true);
	f_allow_amr_rate_4_75k_5_90k_7_40k_12_20k();
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_allow_amr_rate_5_90k();
}

function f_TC_assignment_codec_amr_fail(boolean fr, bitstring s8_s0)
runs on test_CT {

	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	if (fr) {
		pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_F}));
	} else {
		pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_H}));
	}
	pars.ass_codec_list.codecElements[0].s0_7 := s8_s0;
	pars.ass_codec_list.codecElements[0].s8_15 := '00000111'B;

	f_init(1, true);
	f_allow_amr_rate_4_75k_5_90k_7_40k_12_20k();
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_TC_assignment_codec_fail), pars);
	vc_conn.done;
	f_allow_amr_rate_5_90k();
}


/* Set S1, we expect an AMR multirate configuration IE with all four rates
 * set. */
testcase TC_assignment_codec_amr_f_S1() runs on test_CT {
	f_TC_assignment_codec_amr(true, '289520882208'O, '00000010'B, '00000010'B);
	f_shutdown_helper();
}

/* Set S1, we expect an AMR multirate configuration IE with the lower three
 * rates set. */
testcase TC_assignment_codec_amr_h_S1() runs on test_CT {
	f_TC_assignment_codec_amr(false, '2815208820'O, '00000010'B, '00000010'B);
	f_shutdown_helper();
}

/* Set S1 and two other rates, we expect an AMR MULTIRATE CONFIGURATION IE with
 * all four rates (and only S1 set in the ASSIGNMENT COMPLETE) */
testcase TC_assignment_codec_amr_f_S124() runs on test_CT {
	f_TC_assignment_codec_amr(true, '289520882208'O, '00010110'B, '00000010'B);
	f_shutdown_helper();
}

/* Set S1 and two other rates, we expect an AMR MULTIRATE CONFIGURATION IE with
 * all four rates (and only S1 set in the ASSIGNMENT COMPLETE) */
testcase TC_assignment_codec_amr_h_S124() runs on test_CT {
	f_TC_assignment_codec_amr(false, '2815208820'O, '00010110'B, '00000010'B);
	f_shutdown_helper();
}

/* The following block of tests selects more and more rates until all four
 * possible rates are in the active set (full rate) */
testcase TC_assignment_codec_amr_f_S0() runs on test_CT {
	f_TC_assignment_codec_amr(true, '2801'O, '00000001'B, '00000001'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_S02() runs on test_CT {
	f_TC_assignment_codec_amr(true, '28052080'O, '00000101'B, '00000101'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_S024() runs on test_CT {
	f_TC_assignment_codec_amr(true, '2815208820'O, '00010101'B, '00010101'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_S0247() runs on test_CT {
	f_TC_assignment_codec_amr(true, '289520882208'O, '10010101'B, '10010101'B);
	f_shutdown_helper();
}

/* The following block of tests selects more and more rates until all three
 * possible rates are in the active set (half rate) */
testcase TC_assignment_codec_amr_h_S0() runs on test_CT {
	f_TC_assignment_codec_amr(false, '2801'O, '00000001'B, '00000001'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_h_S02() runs on test_CT {
	f_TC_assignment_codec_amr(false, '28052080'O, '00000101'B, '00000101'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_h_S024() runs on test_CT {
	f_TC_assignment_codec_amr(false, '2815208820'O, '00010101'B, '00010101'B);
	f_shutdown_helper();
}

/* The following block tests what happens when the MSC does offer rate
 * configurations that are not supported by the BSC. Normally such situations
 * should not happen because the MSC gets informed by the BSC in advance via
 * the L3 COMPLETE message which rates are applicable. The MSC should not try
 * to offer rates that are not applicable anyway. */

testcase TC_assignment_codec_amr_h_S0247() runs on test_CT {
	/* Try to include 12,2k in into the active set even though the channel
	* is half rate only. The BSC is expected to remove the 12,0k */
	f_TC_assignment_codec_amr(false, '2815208820'O, '10010101'B, '00010101'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_S01234567() runs on test_CT {
	/* See what happens when all rates are selected at once. Since then
	* Also S1 is selected, this setting will be prefered and we should
	* get 12.2k, 7,40k, 5,90k, and 4,75k in the active set. */
	f_TC_assignment_codec_amr(true, '289520882208'O, '11111111'B, '00000010'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_S0234567() runs on test_CT {
	/* Same as above, but with S1 missing, the MSC is then expected to
	* select the currently supported rates, which are also 12.2k, 7,40k,
	* 5,90k, and 4,75k, into the active set. */
	f_TC_assignment_codec_amr(true, '289520882208'O, '11111101'B, '10010101'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_zero() runs on test_CT {
	/* Try to select no rates at all */
	f_TC_assignment_codec_amr_fail(true, '00000000'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_f_unsupp() runs on test_CT {
	/* Try to select only unsupported rates */
	f_TC_assignment_codec_amr_fail(true, '01101000'B);
	f_shutdown_helper();
}

testcase TC_assignment_codec_amr_h_S7() runs on test_CT {
	/* Try to select 12,2k for half rate */
	f_TC_assignment_codec_amr_fail(false, '10000000'B);
	f_shutdown_helper();
}

private function f_disable_all_tch_f() runs on test_CT {
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 1 sub-slot 0 borken");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 2 sub-slot 0 borken");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 3 sub-slot 0 borken");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 4 sub-slot 0 borken");
}

private function f_disable_all_tch_h() runs on test_CT {
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 5 sub-slot 0 borken");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 5 sub-slot 1 borken");
}

private function f_enable_all_tch() runs on test_CT {
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 1 sub-slot 0 unused");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 2 sub-slot 0 unused");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 3 sub-slot 0 unused");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 4 sub-slot 0 unused");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 5 sub-slot 0 unused");
	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 5 sub-slot 1 unused");
}

/* Allow HR only */
private function f_TC_assignment_codec_xr_exhausted_req_hr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '09'O;
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '05'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecHR}));
	f_establish_fully(ass_cmd, exp_compl);
}

/* Allow FR only */
private function f_TC_assignment_codec_xr_exhausted_req_fr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '08'O;
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '01'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	f_establish_fully(ass_cmd, exp_compl);
}

/* Allow HR only (expect assignment failure) */
private function f_TC_assignment_codec_xr_exhausted_req_hr_fail(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_fail := tr_BSSMAP_AssignmentFail;
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '09'O;
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '05'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecHR}));
	f_establish_fully(ass_cmd, exp_fail);
}

/* Allow FR only (expect assignment failure) */
private function f_TC_assignment_codec_xr_exhausted_req_fr_fail(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_fail := tr_BSSMAP_AssignmentFail;
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '08'O;
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '01'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	f_establish_fully(ass_cmd, exp_fail);
}

/* Allow FR and HR, but prefer FR */
private function f_TC_assignment_codec_fr_exhausted_req_fr_hr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '0A'O; /* Prefer FR */
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '8105'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR, ts_CodecHR}));
	exp_compl.pdu.bssmap.assignmentComplete.speechVersion.speechVersionIdentifier := '0000101'B; /* Expect HR */
	f_establish_fully(ass_cmd, exp_compl);
}

/* Allow FR and HR, but prefer HR */
private function f_TC_assignment_codec_fr_exhausted_req_hr_fr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '0B'O; /* Prefer HR */
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '8501'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecHR, ts_CodecFR}));
	exp_compl.pdu.bssmap.assignmentComplete.speechVersion.speechVersionIdentifier := '0000101'B; /* Expect HR */
	f_establish_fully(ass_cmd, exp_compl);
}

/* Allow FR and HR, but prefer FR */
private function f_TC_assignment_codec_hr_exhausted_req_fr_hr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '0A'O; /* Prefer FR */
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '8105'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR, ts_CodecHR}));
	exp_compl.pdu.bssmap.assignmentComplete.speechVersion.speechVersionIdentifier := '0000001'B; /* Expect FR */
	f_establish_fully(ass_cmd, exp_compl);
}

/* Allow FR and HR, but prefer HR */
private function f_TC_assignment_codec_hr_exhausted_req_hr_fr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '0B'O; /* Prefer HR */
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '8501'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecHR, ts_CodecFR}));
	exp_compl.pdu.bssmap.assignmentComplete.speechVersion.speechVersionIdentifier := '0000001'B; /* Expect FR */
	f_establish_fully(ass_cmd, exp_compl);
}

/* Request a HR channel while all FR channels are exhausted, this is expected
 * to work without conflicts */
testcase TC_assignment_codec_fr_exhausted_req_hr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_f();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_xr_exhausted_req_hr));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a FR channel while all FR channels are exhausted, this is expected
 * to fail. */
testcase TC_assignment_codec_fr_exhausted_req_fr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_f();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_xr_exhausted_req_fr_fail));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a FR (prefered) or alternatively a HR channel while all FR channels
 * are exhausted, this is expected to be resolved by selecting a HR channel. */
testcase TC_assignment_codec_fr_exhausted_req_fr_hr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_f();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_fr_exhausted_req_fr_hr));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a HR (prefered) or alternatively a FR channel while all FR channels
 * are exhausted, this is expected to work without conflicts. */
testcase TC_assignment_codec_fr_exhausted_req_hr_fr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_f();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_fr_exhausted_req_hr_fr));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a FR channel while all HR channels are exhausted, this is expected
 * to work without conflicts */
testcase TC_assignment_codec_hr_exhausted_req_fr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_h();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_xr_exhausted_req_fr));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a HR channel while all HR channels are exhausted, this is expected
 * to fail. */
testcase TC_assignment_codec_hr_exhausted_req_hr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_h();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_xr_exhausted_req_hr_fail));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a HR (prefered) or alternatively a FR channel while all HR channels
 * are exhausted, this is expected to be resolved by selecting a FR channel. */
testcase TC_assignment_codec_hr_exhausted_req_hr_fr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_h();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_hr_exhausted_req_hr_fr));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Request a FR (prefered) or alternatively a HR channel while all HR channels
 * are exhausted, this is expected to work without conflicts. */
testcase TC_assignment_codec_hr_exhausted_req_fr_hr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	f_disable_all_tch_h();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_hr_exhausted_req_fr_hr));
	vc_conn.done;
	f_enable_all_tch();
	f_shutdown_helper();
}

/* Allow FR and HR, but prefer HR */
private function f_TC_assignment_codec_req_hr_fr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '0B'O; /* Prefer HR */
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '8501'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecHR, ts_CodecFR}));
	exp_compl.pdu.bssmap.assignmentComplete.speechVersion.speechVersionIdentifier := '0000101'B; /* Expect HR */
	f_establish_fully(ass_cmd, exp_compl);
}

/* Allow FR and HR, but prefer FR */
private function f_TC_assignment_codec_req_fr_hr(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.channelRateAndType := '0A'O; /* Prefer FR */
	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := '8105'O;
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR, ts_CodecHR}));
	exp_compl.pdu.bssmap.assignmentComplete.speechVersion.speechVersionIdentifier := '0000001'B; /* Expect FR */
	f_establish_fully(ass_cmd, exp_compl);
}

/* Request a HR (prefered) or alternatively a FR channel, it is expected that
 * HR, which is the prefered type, is selected. */
testcase TC_assignment_codec_req_hr_fr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_req_hr_fr));
	vc_conn.done;
	f_shutdown_helper();
}

/* Request a FR (prefered) or alternatively a HR channel, it is expected that
 * FR, which is the prefered type, is selected. */
testcase TC_assignment_codec_req_fr_hr() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	f_enable_all_tch();
	vc_conn := f_start_handler(refers(f_TC_assignment_codec_req_fr_hr));
	vc_conn.done;
	f_shutdown_helper();
}

testcase TC_assignment_osmux() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	/* See note above */
	var RSL_IE_Body mr_conf := {
		other := {
			len := 2,
			payload := '2804'O
		}
	};

	pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecAMR_H}));
	pars.ass_codec_list.codecElements[0].s0_7 := '00000100'B; /* 5,90k */
	pars.ass_codec_list.codecElements[0].s8_15 := '00000111'B;
	pars.expect_mr_conf_ie := mr_conf;
	pars.use_osmux := true;

	f_init(1, true, true);
	f_sleep(1.0);

	vc_conn := f_start_handler(refers(f_TC_assignment_codec), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* test the procedure of the MSC requesting a Classmark Update:
 * a) BSSMAP Classmark Request should result in RR CLASSMARK ENQUIRY,
 * b) L3 RR CLASSMARK CHANGE should result in BSSMAP CLASSMARK UPDATE */
private function f_tc_classmark(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();

	f_create_chan_and_exp();
	/* we should now have a COMPL_L3 at the MSC */
	BSSAP.receive(tr_BSSMAP_ComplL3);

	BSSAP.send(ts_BSSMAP_ClassmarkRequest);
	RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_CM_ENQUIRY));

	f_rsl_send_l3(ts_RRM_CM_CHG(valueof(ts_CM2)));
	BSSAP.receive(tr_BSSMAP_ClassmarkUpd(?, omit));
	setverdict(pass);
}
testcase TC_classmark() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_classmark));
	vc_conn.done;
	f_shutdown_helper();
}

/* Send a CommonID from the simulated MSC and verify that the information is used to
 * fill BSC-internal data structures (specifically, bsc_subscr associated with subscr_conn) */
private function f_tc_common_id(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	f_MscConnHdlr_init_vty();

	f_create_chan_and_exp();
	/* we should now have a COMPL_L3 at the MSC */
	BSSAP.receive(tr_BSSMAP_ComplL3);

	/* Send CommonID */
	BSSAP.send(ts_BSSMAP_CommonId(g_pars.imsi));

	/* Use VTY to verify that the IMSI of the subscr_conn is set */
	var charstring regex := "*(IMSI: " & hex2str(g_pars.imsi) & ")*";
	f_vty_transceive_match_regexp_retry(BSCVTY, "show conns", regex, 0, 4, 1.0);

	setverdict(pass);
}
testcase TC_common_id() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_common_id));
	vc_conn.done;
	f_shutdown_helper();
}

private function f_est_single_l3(template PDU_ML3_MS_NW l3) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	f_create_chan_and_exp();
	/* we should now have a COMPL_L3 at the MSC */
	BSSAP.receive(tr_BSSMAP_ComplL3);

	/* send the single message we want to send */
	f_rsl_send_l3(l3);
}

private function f_bssap_expect_nothing(float sec := 5.00) runs on MSC_ConnHdlr {
	timer T := sec;
	var PDU_BSSAP bssap;
	T.start;
	alt {
	[] BSSAP.receive(PDU_BSSAP:?) -> value bssap {
		setverdict(fail, "Unexpected BSSMAP ", bssap);
		mtc.stop;
		}
	[] T.timeout {
		setverdict(pass);
		}
	}
}

/* unsolicited ASSIGNMENT FAIL (without ASSIGN) from MS shouldn't bring BSC down */
private function f_tc_unsol_ass_fail(charstring id) runs on MSC_ConnHdlr {
	f_est_single_l3(ts_RRM_AssignmentFailure('00'O));
	f_bssap_expect_nothing();
}
testcase TC_unsol_ass_fail() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_unsol_ass_fail));
	vc_conn.done;
	f_shutdown_helper();
}


/* unsolicited ASSIGNMENT COMPLETE (without ASSIGN) from MS shouldn't bring BSC down */
private function f_tc_unsol_ass_compl(charstring id) runs on MSC_ConnHdlr {
	f_est_single_l3(ts_RRM_AssignmentComplete('00'O));
	f_bssap_expect_nothing();
}
testcase TC_unsol_ass_compl() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_unsol_ass_compl));
	vc_conn.done;
	f_shutdown_helper();
}


/* unsolicited HANDOVER FAIL (without ASSIGN) from MS shouldn't bring BSC down */
private function f_tc_unsol_ho_fail(charstring id) runs on MSC_ConnHdlr {
	f_est_single_l3(ts_RRM_HandoverFailure('00'O));
	f_bssap_expect_nothing();
}
testcase TC_unsol_ho_fail() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_unsol_ho_fail));
	vc_conn.done;
	f_shutdown_helper();
}


/* short message from MS should be ignored */
private function f_tc_err_82_short_msg(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	f_create_chan_and_exp();
	/* we should now have a COMPL_L3 at the MSC */
	BSSAP.receive(tr_BSSMAP_ComplL3);

	/* send short message */
	RSL.send(ts_RSL_DATA_IND(g_chan_nr, valueof(ts_RslLinkID_DCCH(0)), ''O));
	f_bssap_expect_nothing();
}
testcase TC_err_82_short_msg() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_err_82_short_msg));
	vc_conn.done;
	f_shutdown_helper();
}


/* 24.008 8.4 Unknown message must trigger RR STATUS */
private function f_tc_err_84_unknown_msg(charstring id) runs on MSC_ConnHdlr {
	f_est_single_l3(ts_RRM_UL_REL('00'O));
	timer T := 3.0
	alt {
	[] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_STATUS)) {
		setverdict(pass);
		}
	[] BSSAP.receive { setverdict(fail, "unexpected BSSAP"); }
	[] T.timeout { setverdict(fail, "Timeout waiting for RR STATUS"); }
	}
}
testcase TC_err_84_unknown_msg() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_err_84_unknown_msg));
	vc_conn.done;
	f_shutdown_helper();
}

/***********************************************************************
 * Handover
 ***********************************************************************/

/* execute a "bts <0-255> trx <0-255> timeslot <0-7> " command on given Dchan */
private function f_vty_ts_action(charstring suffix, integer bts_nr, integer trx_nr, integer ts_nr)
runs on test_CT {
	var charstring cmd := "bts "&int2str(bts_nr)&" trx "&int2str(trx_nr)&
				" timeslot "&int2str(ts_nr)&" ";
	f_vty_transceive(BSCVTY, cmd & suffix);
}

/* execute a "bts <0-255> trx <0-255> timeslot <0-7> sub-slot <0-7>" command on given Dchan */
private function f_vty_ss_action(TELNETasp_PT pt, charstring suffix,
				 uint8_t bts_nr, uint8_t trx_nr,
				 in RslChannelNr chan_nr)
{
	/* FIXME: resolve those from component-global state */
	var integer ts_nr := chan_nr.tn;
	var integer ss_nr;
	if (ischosen(chan_nr.u.ch0)) {
		ss_nr := 0;
	} else if (ischosen(chan_nr.u.lm)) {
		ss_nr := chan_nr.u.lm.sub_chan;
	} else if (ischosen(chan_nr.u.sdcch4)) {
		ss_nr := chan_nr.u.sdcch4.sub_chan;
	} else if (ischosen(chan_nr.u.sdcch8)) {
		ss_nr := chan_nr.u.sdcch8.sub_chan;
	} else {
		setverdict(fail, "Invalid ChanNr ", chan_nr);
		mtc.stop;
	}

	var charstring cmd := "bts "&int2str(bts_nr)&" trx "&int2str(trx_nr)&
				" timeslot "&int2str(ts_nr)&" sub-slot "&int2str(ss_nr)&" ";
	f_vty_transceive(pt, cmd & suffix);
}

/* Even though the VTY command to trigger handover takes a new BTS number as argument, behind the scenes osmo-bsc always
 * translates that to a target ARFCN+BSIC first. See bsc_vty.c trigger_ho_or_as(), which puts the selected BTS' neighbor
 * ident key (ARFCN + BSIC) in the struct passed on to handover_request(). handover_start() then resolves that to a
 * viable actual neighbor cell. So from the internal osmo-bsc perspective, we always request handover to an ARFCN + BSIC
 * pair, not really to a specific BTS number. */
private function f_vty_handover(TELNETasp_PT pt, uint8_t bts_nr, uint8_t trx_nr,
				in RslChannelNr chan_nr, uint8_t new_bts_nr)
{
	f_vty_ss_action(pt, "handover " & int2str(new_bts_nr), bts_nr, trx_nr, chan_nr);
}

/* intra-BSC hand-over between BTS0 and BTS1 */
private function f_tc_ho_int(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	const OCT8 kc := '0001020304050607'O;

	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));

	f_establish_fully(ass_cmd, exp_compl);
	f_bts_0_cfg(BSCVTY, {"neighbor bts 1"});

	var HandoverState hs := {
		rr_ho_cmpl_seen := false,
		handover_done := false,
		old_chan_nr := -
	};
	/* issue hand-over command on VTY */
	f_vty_handover(BSCVTY, 0, 0, g_chan_nr, 1);
	/* temporarily suspend DChan processing on BTS1 to avoid race with RSLEM_register */
	f_rslem_suspend(RSL1_PROC);

	/* From the MGW perspective, a handover is is characterized by
	 * performing one MDCX operation with the MGW. So we expect to see
	 * one more MDCX during handover. */
	g_media.mgcp_conn[0].mdcx_seen_exp := g_media.mgcp_conn[0].crcx_seen_exp + 1;

	alt {
	[] as_handover(hs);
	}

	/* Since this is an internal handover we expect the BSC to inform the
	 * MSC about the event */
	BSSAP.receive(tr_BSSMAP_HandoverPerformed);

	/* Check the amount of MGCP transactions is still consistant with the
	 * test expectation */
	f_check_mgcp_expectations()
	f_sleep(0.5);
}

testcase TC_ho_int() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(2, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	vc_conn := f_start_handler(refers(f_tc_ho_int));
	vc_conn.done;

	/* from f_establish_fully() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");
	/* from handover */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:completed");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:attempted");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:completed");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

/* Expecting MGCP to DLCX the endpoint's two connections: towards BTS and towards MSC */
private function f_expect_dlcx_conns() runs on MSC_ConnHdlr {
	var MgcpCommand mgcp;
	var template MgcpResponse mgcp_resp;
	var MGCP_RecvFrom mrf;
	var template MgcpMessage msg_resp;
	var template MgcpMessage msg_dlcx := {
		command := tr_DLCX()
	}

	if (g_pars.aoip) {
		MGCP.receive(tr_DLCX()) -> value mgcp {
				log("Got first DLCX: ", mgcp);
				MGCP.send(ts_DLCX_ACK2(mgcp.line.trans_id));
			};

		MGCP.receive(tr_DLCX()) -> value mgcp {
				log("Got second DLCX: ", mgcp);
				MGCP.send(ts_DLCX_ACK2(mgcp.line.trans_id));
			};
	} else  {
		/* For SCCPLite, BSC doesn't handle the MSC-side */
		MGCP_MULTI.receive(tr_MGCP_RecvFrom_any(msg_dlcx)) -> value mrf {
			log("Got first DLCX: ", mrf.msg.command);
			msg_resp := {
				response := ts_DLCX_ACK2(mrf.msg.command.line.trans_id)
			}
			MGCP_MULTI.send(t_MGCP_SendToMrf(mrf, msg_resp));
		};
	}

	BSSAP.receive(tr_BSSMAP_ClearComplete);
}

private function f_tc_ho_out_of_this_bsc(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();

	var PDU_BSSAP ass_req := f_gen_ass_req();
	ass_req.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_req.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	f_establish_fully(ass_req, exp_compl);

	f_bts_0_cfg(BSCVTY, {"neighbor lac 99 arfcn 123 bsic any"});
	f_vty_transceive(BSCVTY, "handover any to arfcn 123 bsic any");

	BSSAP.receive(tr_BSSMAP_HandoverRequired);

	f_sleep(0.5);
	/* The MSC negotiates Handover Request and Handover Request Ack with
	 * the other BSS and comes back with a BSSMAP Handover Command
	 * containing an RR Handover Command coming from the target BSS... */

	var PDU_ML3_NW_MS rr_ho_cmd := valueof(ts_RR_HandoverCommand);
	log("Remote cell's RR Handover Command passed through as L3 Info: ", rr_ho_cmd);
	var octetstring rr_ho_cmd_enc := enc_PDU_ML3_NW_MS(rr_ho_cmd);
	log("Remote cell's RR Handover Command passed through as L3 Info, encoded: ", rr_ho_cmd_enc);
	BSSAP.send(ts_BSSMAP_HandoverCommand(rr_ho_cmd_enc));

	/* expect the Handover Command to go out on RR */
	var RSL_Message rsl_ho_cmd
	RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, ?)) -> value rsl_ho_cmd;
	log("RSL Data Req went out to first BTS: ", rsl_ho_cmd);
	var RSL_IE_Body rsl_ho_cmd_l3;
	if (not f_rsl_find_ie(rsl_ho_cmd, RSL_IE_L3_INFO, rsl_ho_cmd_l3)) {
		log("RSL message contains no L3 Info IE, expected RR Handover Command");
		setverdict(fail);
	} else {
		log("Found L3 Info: ", rsl_ho_cmd_l3);
		if (rsl_ho_cmd_l3.l3_info.payload != rr_ho_cmd_enc) {
			log("FAIL: the BSC sent out a different L3 Info, not matching the RR Handover Command the other BSS forwarded.");
			setverdict(fail);
		} else {
			log("Success: the BSC sent out the same RR Handover Command the other BSS forwarded.");
			setverdict(pass);
		}
	}

	/* When the other BSS has reported a completed handover, this side is
	 * torn down. */

	var myBSSMAP_Cause cause_val := GSM0808_CAUSE_HANDOVER_SUCCESSFUL;
	var BssmapCause cause := enum2int(cause_val);
	BSSAP.send(ts_BSSMAP_ClearCommand(cause));

	f_expect_dlcx_conns();
	setverdict(pass);
	f_sleep(1.0);
}
testcase TC_ho_out_of_this_bsc() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	vc_conn := f_start_handler(refers(f_tc_ho_out_of_this_bsc));
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:completed");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:completed");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_mo_l3_transceive(RSL_DCHAN_PT rsl := RSL,
				    template (value) RslLinkId link_id := ts_RslLinkID_DCCH(0),
				    template (present) OCT1 dlci := ?,
				    octetstring l3 := '0123456789'O)
runs on MSC_ConnHdlr {
	/* The old lchan and conn should still be active. See that arbitrary L3
	 * is still going through. */
	rsl.send(ts_RSL_DATA_IND(g_chan_nr, link_id, l3));
	var template PDU_BSSAP exp_data := {
		    discriminator := '1'B,
		    spare := '0000000'B,
		    dlci := dlci,
		    lengthIndicator := lengthof(l3),
		    pdu := {
			dtap := l3
		    }
		};
	BSSAP.receive(exp_data);
	setverdict(pass);
}

private function f_mt_l3_transceive(RSL_DCHAN_PT rsl := RSL,
				    template (present) RslLinkId link_id := tr_RslLinkID_DCCH(0),
				    template (value) OCT1 dlci := '00'O,
				    octetstring l3 := '0123456789'O)
runs on MSC_ConnHdlr {
	BSSAP.send(PDU_BSSAP:{
		discriminator := '1'B,
		spare := '0000000'B,
		dlci := dlci,
		lengthIndicator := lengthof(l3),
		pdu := {
			dtap := l3
		}
	});
	rsl.receive(tr_RSL_DATA_REQ(g_chan_nr, link_id, l3));
	setverdict(pass);
}

/* BSC asks for inter-BSC HO, but the MSC decides that it won't happen and
 * simply never sends a BSSMAP Handover Command. */
private function f_tc_ho_out_fail_no_msc_response(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();

	var PDU_BSSAP ass_req := f_gen_ass_req();
	ass_req.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_req.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	f_establish_fully(ass_req, exp_compl);

	f_bts_0_cfg(BSCVTY, {"neighbor lac 99 arfcn 123 bsic any"});
	f_vty_transceive(BSCVTY, "handover any to arfcn 123 bsic any");

	BSSAP.receive(tr_BSSMAP_HandoverRequired);

	/* osmo-bsc should time out 10 seconds after the handover started.
	 * Let's give it a bit extra. */
	f_sleep(15.0);

	f_mo_l3_transceive();
	f_sleep(1.0);
}
testcase TC_ho_out_fail_no_msc_response() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	vc_conn := f_start_handler(refers(f_tc_ho_out_fail_no_msc_response));
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:timeout");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:timeout");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

/* BSC asks for inter-BSC HO, receives BSSMAP Handover Command, but MS reports
 * RR Handover Failure. */
private function f_tc_ho_out_fail_rr_ho_failure(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();

	var PDU_BSSAP ass_req := f_gen_ass_req();
	ass_req.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_req.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	f_establish_fully(ass_req, exp_compl);

	f_bts_0_cfg(BSCVTY, {"neighbor lac 99 arfcn 123 bsic any"});
	f_vty_transceive(BSCVTY, "handover any to arfcn 123 bsic any");

	BSSAP.receive(tr_BSSMAP_HandoverRequired);

	f_sleep(0.5);
	/* The MSC negotiates Handover Request and Handover Request Ack with
	 * the other BSS and comes back with a BSSMAP Handover Command
	 * containing an RR Handover Command coming from the target BSS... */

	var PDU_ML3_NW_MS rr_ho_cmd := valueof(ts_RR_HandoverCommand);
	log("Remote cell's RR Handover Command passed through as L3 Info: ", rr_ho_cmd);
	var octetstring rr_ho_cmd_enc := enc_PDU_ML3_NW_MS(rr_ho_cmd);
	log("Remote cell's RR Handover Command passed through as L3 Info, encoded: ", rr_ho_cmd_enc);
	BSSAP.send(ts_BSSMAP_HandoverCommand(rr_ho_cmd_enc));

	/* expect the Handover Command to go out on RR */
	var RSL_Message rsl_ho_cmd
	RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, ?)) -> value rsl_ho_cmd;
	log("RSL Data Req went out to first BTS: ", rsl_ho_cmd);
	var RSL_IE_Body rsl_ho_cmd_l3;
	if (not f_rsl_find_ie(rsl_ho_cmd, RSL_IE_L3_INFO, rsl_ho_cmd_l3)) {
		log("RSL message contains no L3 Info IE, expected RR Handover Command");
		setverdict(fail);
	} else {
		log("Found L3 Info: ", rsl_ho_cmd_l3);
		if (rsl_ho_cmd_l3.l3_info.payload != rr_ho_cmd_enc) {
			log("FAIL: the BSC sent out a different L3 Info, not matching the RR Handover Command the other BSS forwarded.");
			setverdict(fail);
		} else {
			log("Success: the BSC sent out the same RR Handover Command the other BSS forwarded.");
			setverdict(pass);
		}
	}

	f_sleep(0.2);
	f_rsl_send_l3(ts_RRM_HandoverFailure('00'O));

	/* Should tell the MSC about the failure */
	BSSAP.receive(tr_BSSMAP_HandoverFailure);

	f_sleep(1.0);

	f_mo_l3_transceive();
	f_sleep(1.0);

	setverdict(pass);
	f_sleep(1.0);
}
testcase TC_ho_out_fail_rr_ho_failure() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	vc_conn := f_start_handler(refers(f_tc_ho_out_fail_rr_ho_failure));
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:failed");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:failed");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

/* BSC asks for inter-BSC-out HO, receives BSSMAP Handover Command, but then no reply is received about HO outcome
 * (neither BSSMAP Clear Command for success nor RR Handover Failure). 48.008 3.1.5.3.3 "Abnormal Conditions" applies
 * and the lchan is released. */
private function f_tc_ho_out_fail_no_result_after_ho_cmd(charstring id) runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();

	var PDU_BSSAP ass_req := f_gen_ass_req();
	ass_req.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_req.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	f_establish_fully(ass_req, exp_compl);

	f_bts_0_cfg(BSCVTY, {"neighbor lac 99 arfcn 123 bsic any"});
	f_vty_transceive(BSCVTY, "handover any to arfcn 123 bsic any");

	BSSAP.receive(tr_BSSMAP_HandoverRequired);

	f_sleep(0.5);
	/* The MSC negotiates Handover Request and Handover Request Ack with
	 * the other BSS and comes back with a BSSMAP Handover Command
	 * containing an RR Handover Command coming from the target BSS... */

	var PDU_ML3_NW_MS rr_ho_cmd := valueof(ts_RR_HandoverCommand);
	log("Remote cell's RR Handover Command passed through as L3 Info: ", rr_ho_cmd);
	var octetstring rr_ho_cmd_enc := enc_PDU_ML3_NW_MS(rr_ho_cmd);
	log("Remote cell's RR Handover Command passed through as L3 Info, encoded: ", rr_ho_cmd_enc);
	BSSAP.send(ts_BSSMAP_HandoverCommand(rr_ho_cmd_enc));

	/* expect the Handover Command to go out on RR */
	var RSL_Message rsl_ho_cmd
	RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, ?)) -> value rsl_ho_cmd;
	log("RSL Data Req went out to first BTS: ", rsl_ho_cmd);
	var RSL_IE_Body rsl_ho_cmd_l3;
	if (not f_rsl_find_ie(rsl_ho_cmd, RSL_IE_L3_INFO, rsl_ho_cmd_l3)) {
		log("RSL message contains no L3 Info IE, expected RR Handover Command");
		setverdict(fail);
	} else {
		log("Found L3 Info: ", rsl_ho_cmd_l3);
		if (rsl_ho_cmd_l3.l3_info.payload != rr_ho_cmd_enc) {
			log("FAIL: the BSC sent out a different L3 Info, not matching the RR Handover Command the other BSS forwarded.");
			setverdict(fail);
		} else {
			log("Success: the BSC sent out the same RR Handover Command the other BSS forwarded.");
			setverdict(pass);
		}
	}

	/* We get neither success nor failure report from the remote BSS.  Eventually T8 times out and we run into 3GPP
	 * TS 48.008 3.1.5.3.3 "Abnormal Conditions": Clear Request should go to the MSC, and RR should be released
	 * after Clear Command */

	var PDU_BSSAP rx_clear_request;
	BSSAP.receive(tr_BSSMAP_ClearRequest) -> value rx_clear_request;
	log("Got BSSMAP Clear Request");
	/* Instruct BSC to clear channel */
	var BssmapCause cause := bit2int(rx_clear_request.pdu.bssmap.clearRequest.cause.causeValue);
	BSSAP.send(ts_BSSMAP_ClearCommand(cause));

	var MgcpCommand mgcp;
	interleave {
	[] RSL.receive(tr_RSL_DEACT_SACCH(g_chan_nr)) {
			log("Got Deact SACCH");
		}
	[] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_RELEASE)) {
			log("Got RR Release");
		}
	[] RSL.receive(tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL)) {
			log("Got RF Chan Rel");
			RSL.send(ts_RSL_RF_CHAN_REL_ACK(g_chan_nr));
		}
	}

	f_expect_dlcx_conns();

	setverdict(pass);
	f_sleep(1.0);
}
testcase TC_ho_out_fail_no_result_after_ho_cmd() runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	vc_conn := f_start_handler(refers(f_tc_ho_out_fail_no_result_after_ho_cmd));
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:timeout");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:timeout");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_into_this_bsc(charstring id) runs on MSC_ConnHdlr {
	/* Hack: the proper way would be to wait for the BSSMAP Handover Request ACK and extract the
	 * actual assigned chan_nr from its L3 (RR Handover Command) message. But osmo-bsc starts acting
	 * on the lchan even before we get a chance to evaluate the BSSMAP Handover Request ACK. So we
	 * need to assume that osmo-bsc will activate TS 1 and already set up this lchan's RSL emulation
	 * before we get started. */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	f_rslem_register(0, new_chan_nr);
	g_chan_nr := new_chan_nr;
	f_sleep(1.0);

	f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit});
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	activate(as_Media());

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     f_gen_handover_req(aoip_tla := g_pars.host_aoip_tla)));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	/* The RSL Emulation magically accepts the Chan Activ behind the scenes. */

	var PDU_BSSAP rx_bssap;
	var octetstring ho_command_str;

	BSSAP.receive(tr_BSSMAP_HandoverRequestAcknowledge(?)) -> value rx_bssap;

	ho_command_str := rx_bssap.pdu.bssmap.handoverRequestAck.layer3Information.layer3info;
	log("Received L3 Info in HO Request Ack: ", ho_command_str);
	var PDU_ML3_NW_MS ho_command := dec_PDU_ML3_NW_MS(ho_command_str);
	log("L3 Info in HO Request Ack is ", ho_command);

	var GsmArfcn arfcn;
	var RslChannelNr actual_new_chan_nr;
	f_ChDesc2RslChanNr(ho_command.msgs.rrm.handoverCommand.channelDescription2,
			actual_new_chan_nr, arfcn);

	if (actual_new_chan_nr != new_chan_nr) {
		log("ERROR: osmo-bsc assigned a different lchan than we assumed above -- this test will fail now.",
		    " Assumed: ", new_chan_nr, " Assigned: ", actual_new_chan_nr);
		setverdict(fail);
		return;
	}
	log("Handover Command chan_nr is", actual_new_chan_nr);

	/* Now the MSC forwards the RR Handover Command to the other BSC, which
	 * tells the MS to handover to the new lchan. Here comes the new MS on
	 * the new lchan with a Handover RACH: */

	/* send handover detect */

	RSL.send(ts_RSL_HANDO_DET(new_chan_nr));

	BSSAP.receive(tr_BSSMAP_HandoverDetect);

	/* send handover complete over the new channel */

	var PDU_ML3_MS_NW l3_tx := valueof(ts_RRM_HandoverComplete('00'O));
	RSL.send(ts_RSL_EST_IND(new_chan_nr, valueof(ts_RslLinkID_DCCH(0)),
				enc_PDU_ML3_MS_NW(l3_tx)));

	BSSAP.receive(tr_BSSMAP_HandoverComplete);
	setverdict(pass);
}
function f_tc_ho_into_this_bsc_main(TestHdlrParams pars) runs on test_CT {
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_ho_into_this_bsc), pars);
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:completed");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:completed");
	f_ctrs_bsc_and_bts_verify();
}

testcase TC_ho_into_this_bsc() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	f_tc_ho_into_this_bsc_main(pars);
	f_shutdown_helper();
}

testcase TC_ho_into_this_bsc_tla_v6() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	pars.host_aoip_tla := "::6";
	f_tc_ho_into_this_bsc_main(pars);
	f_shutdown_helper();
}

private function f_tc_ho_in_fail_msc_clears(charstring id) runs on MSC_ConnHdlr {
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	f_rslem_register(0, new_chan_nr);
	g_chan_nr := new_chan_nr;
	f_sleep(1.0);

	f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit});
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	activate(as_Media());

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     f_gen_handover_req()));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	/* The RSL Emulation magically accepts the Chan Activ behind the scenes. */

	var PDU_BSSAP rx_bssap;
	var octetstring ho_command_str;

	BSSAP.receive(tr_BSSMAP_HandoverRequestAcknowledge(?)) -> value rx_bssap;

	ho_command_str := rx_bssap.pdu.bssmap.handoverRequestAck.layer3Information.layer3info;
	log("Received L3 Info in HO Request Ack: ", ho_command_str);
	var PDU_ML3_NW_MS ho_command := dec_PDU_ML3_NW_MS(ho_command_str);
	log("L3 Info in HO Request Ack is ", ho_command);

	var GsmArfcn arfcn;
	var RslChannelNr actual_new_chan_nr;
	f_ChDesc2RslChanNr(ho_command.msgs.rrm.handoverCommand.channelDescription2,
			actual_new_chan_nr, arfcn);

	if (actual_new_chan_nr != new_chan_nr) {
		log("ERROR: osmo-bsc assigned a different lchan than we assumed above -- this test will fail now.",
		    " Assumed: ", new_chan_nr, " Assigned: ", actual_new_chan_nr);
		setverdict(fail);
		return;
	}
	log("Handover Command chan_nr is", actual_new_chan_nr);

	/* For deterministic test results, give some time for the MGW endpoint to be configured */
	f_sleep(1.0);

	/* Now the MSC forwards the RR Handover Command to the other BSC, which
	 * tells the MS to handover to the new lchan. In this case, the MS
	 * reports a Handover Failure to the old BSS, which forwards a BSSMAP
	 * Handover Failure to the MSC. The procedure according to 3GPP TS
	 * 48.008 3.1.5.3.2 "Handover Failure" is then that the MSC sends a
	 * BSSMAP Clear Command: */

	var myBSSMAP_Cause cause_val := GSM0808_CAUSE_RADIO_INTERFACE_FAILURE_REVERSION;
	var BssmapCause cause := enum2int(cause_val);
	BSSAP.send(ts_BSSMAP_ClearCommand(cause));

	f_expect_dlcx_conns();
	setverdict(pass);
	f_sleep(1.0);

	setverdict(pass);
}
testcase TC_ho_in_fail_msc_clears() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_ho_in_fail_msc_clears), pars);
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:stopped");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:stopped");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_in_fail_msc_clears_after_ho_detect(charstring id) runs on MSC_ConnHdlr {
	/* Hack: the proper way would be to wait for the BSSMAP Handover Request ACK and extract the
	 * actual assigned chan_nr from its L3 (RR Handover Command) message. But osmo-bsc starts acting
	 * on the lchan even before we get a chance to evaluate the BSSMAP Handover Request ACK. So we
	 * need to assume that osmo-bsc will activate TS 1 and already set up this lchan's RSL emulation
	 * before we get started. */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	f_rslem_register(0, new_chan_nr);
	g_chan_nr := new_chan_nr;
	f_sleep(1.0);

	f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit});
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	activate(as_Media());

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     f_gen_handover_req()));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	/* The RSL Emulation magically accepts the Chan Activ behind the scenes. */

	var PDU_BSSAP rx_bssap;
	var octetstring ho_command_str;

	BSSAP.receive(tr_BSSMAP_HandoverRequestAcknowledge(?)) -> value rx_bssap;

	ho_command_str := rx_bssap.pdu.bssmap.handoverRequestAck.layer3Information.layer3info;
	log("Received L3 Info in HO Request Ack: ", ho_command_str);
	var PDU_ML3_NW_MS ho_command := dec_PDU_ML3_NW_MS(ho_command_str);
	log("L3 Info in HO Request Ack is ", ho_command);

	var GsmArfcn arfcn;
	var RslChannelNr actual_new_chan_nr;
	f_ChDesc2RslChanNr(ho_command.msgs.rrm.handoverCommand.channelDescription2,
			actual_new_chan_nr, arfcn);

	if (actual_new_chan_nr != new_chan_nr) {
		log("ERROR: osmo-bsc assigned a different lchan than we assumed above -- this test will fail now.",
		    " Assumed: ", new_chan_nr, " Assigned: ", actual_new_chan_nr);
		setverdict(fail);
		return;
	}
	log("Handover Command chan_nr is", actual_new_chan_nr);

	/* Now the MSC forwards the RR Handover Command to the other BSC, which
	 * tells the MS to handover to the new lchan. Here comes the new MS on
	 * the new lchan with a Handover RACH: */

	/* send handover detect */

	RSL.send(ts_RSL_HANDO_DET(new_chan_nr));

	BSSAP.receive(tr_BSSMAP_HandoverDetect);

	/* The MSC chooses to clear the connection now, maybe we got the
	 * Handover RACH on the new cell but the MS still signaled Handover
	 * Failure to the old BSS? */

	var myBSSMAP_Cause cause_val := GSM0808_CAUSE_RADIO_INTERFACE_FAILURE_REVERSION;
	var BssmapCause cause := enum2int(cause_val);
	BSSAP.send(ts_BSSMAP_ClearCommand(cause));

	f_expect_dlcx_conns();
	f_sleep(1.0);
}
testcase TC_ho_in_fail_msc_clears_after_ho_detect() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_ho_in_fail_msc_clears_after_ho_detect), pars);
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:stopped");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:stopped");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

/* The new BSS's lchan times out before the MSC decides that handover failed. */
private function f_tc_ho_in_fail_no_detect(charstring id) runs on MSC_ConnHdlr {
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	f_rslem_register(0, new_chan_nr);
	g_chan_nr := new_chan_nr;
	f_sleep(1.0);

	f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit});
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	activate(as_Media());

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     f_gen_handover_req()));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	/* The RSL Emulation magically accepts the Chan Activ behind the scenes. */

	var PDU_BSSAP rx_bssap;
	var octetstring ho_command_str;

	BSSAP.receive(tr_BSSMAP_HandoverRequestAcknowledge(?)) -> value rx_bssap;

	ho_command_str := rx_bssap.pdu.bssmap.handoverRequestAck.layer3Information.layer3info;
	log("Received L3 Info in HO Request Ack: ", ho_command_str);
	var PDU_ML3_NW_MS ho_command := dec_PDU_ML3_NW_MS(ho_command_str);
	log("L3 Info in HO Request Ack is ", ho_command);

	var GsmArfcn arfcn;
	var RslChannelNr actual_new_chan_nr;
	f_ChDesc2RslChanNr(ho_command.msgs.rrm.handoverCommand.channelDescription2,
			actual_new_chan_nr, arfcn);

	if (actual_new_chan_nr != new_chan_nr) {
		log("ERROR: osmo-bsc assigned a different lchan than we assumed above -- this test will fail now.",
		    " Assumed: ", new_chan_nr, " Assigned: ", actual_new_chan_nr);
		setverdict(fail);
		return;
	}
	log("Handover Command chan_nr is", actual_new_chan_nr);

	/* Now the MSC forwards the RR Handover Command to the other BSC, which
	 * tells the MS to handover to the new lchan. But the MS never shows up
	 * on the new lchan. */

	BSSAP.receive(tr_BSSMAP_HandoverFailure);

	/* Did osmo-bsc also send a Clear Request? */
	timer T := 0.5;
	T.start;
	alt {
	[] BSSAP.receive(tr_BSSMAP_ClearRequest);
	[] T.timeout { }
	}

	/* MSC plays along with a Clear Command (no matter whether osmo-bsc
	 * asked for it, this is a Handover Failure after all). */

	var myBSSMAP_Cause cause_val := GSM0808_CAUSE_RADIO_INTERFACE_FAILURE_REVERSION;
	var BssmapCause cause := enum2int(cause_val);
	BSSAP.send(ts_BSSMAP_ClearCommand(cause));

	f_expect_dlcx_conns();
	f_sleep(1.0);
}
testcase TC_ho_in_fail_no_detect() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_ho_in_fail_no_detect), pars);
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:error");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

/* Same as f_tc_ho_in_fail_no_detect, but MSC fails to send a Clear Command */
private function f_tc_ho_in_fail_no_detect2(charstring id) runs on MSC_ConnHdlr {
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	f_rslem_register(0, new_chan_nr);
	g_chan_nr := new_chan_nr;
	f_sleep(1.0);

	f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit});
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	activate(as_Media());

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     f_gen_handover_req()));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	/* The RSL Emulation magically accepts the Chan Activ behind the scenes. */

	var PDU_BSSAP rx_bssap;
	var octetstring ho_command_str;

	BSSAP.receive(tr_BSSMAP_HandoverRequestAcknowledge(?)) -> value rx_bssap;

	ho_command_str := rx_bssap.pdu.bssmap.handoverRequestAck.layer3Information.layer3info;
	log("Received L3 Info in HO Request Ack: ", ho_command_str);
	var PDU_ML3_NW_MS ho_command := dec_PDU_ML3_NW_MS(ho_command_str);
	log("L3 Info in HO Request Ack is ", ho_command);

	var GsmArfcn arfcn;
	var RslChannelNr actual_new_chan_nr;
	f_ChDesc2RslChanNr(ho_command.msgs.rrm.handoverCommand.channelDescription2,
			actual_new_chan_nr, arfcn);

	if (actual_new_chan_nr != new_chan_nr) {
		log("ERROR: osmo-bsc assigned a different lchan than we assumed above -- this test will fail now.",
		    " Assumed: ", new_chan_nr, " Assigned: ", actual_new_chan_nr);
		setverdict(fail);
		return;
	}
	log("Handover Command chan_nr is", actual_new_chan_nr);

	/* Now the MSC forwards the RR Handover Command to the other BSC, which
	 * tells the MS to handover to the new lchan. But the MS never shows up
	 * on the new lchan. */

	BSSAP.receive(tr_BSSMAP_HandoverFailure);

	/* MSC plays dumb and sends no Clear Command */
	var PDU_BSSAP rx_clear_request;

	BSSAP.receive(tr_BSSMAP_ClearRequest) -> value rx_clear_request {
		var BssmapCause cause := bit2int(rx_clear_request.pdu.bssmap.clearRequest.cause.causeValue);
		BSSAP.send(ts_BSSMAP_ClearCommand(cause));
	};
	f_expect_dlcx_conns();
	f_sleep(1.0);
}
testcase TC_ho_in_fail_no_detect2() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	f_ctrs_bsc_and_bts_init();

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_ho_in_fail_no_detect2), pars);
	vc_conn.done;

	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_in:error");
	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

type record of charstring Commands;

private function f_bts_0_cfg(TELNETasp_PT pt, Commands cmds := {})
{
	f_vty_enter_cfg_bts(pt, 0);
	for (var integer i := 0; i < sizeof(cmds); i := i+1) {
		f_vty_transceive(pt, cmds[i]);
	}
	f_vty_transceive(pt, "end");
}

private function f_cs7_inst_0_cfg(TELNETasp_PT pt, Commands cmds := {})
{
	f_vty_enter_cfg_cs7_inst(pt, 0);
	for (var integer i := 0; i < sizeof(cmds); i := i+1) {
		f_vty_transceive(pt, cmds[i]);
	}
	f_vty_transceive(pt, "end");
}

private function f_probe_for_handover(charstring log_label,
				      charstring log_descr,
				      charstring handover_vty_cmd,
				      boolean expect_handover,
				      boolean is_inter_bsc_handover := false)
runs on MSC_ConnHdlr
{
	/* We're going to thwart any and all handover attempts, just be ready to handle (and ignore) handover target
	 * lchans to be established on bts 1 or bts 2. */
	f_rslem_suspend(RSL1_PROC);
	f_rslem_suspend(RSL2_PROC);

	var RSL_Message rsl;

	var charstring log_msg := " (expecting handover)"
	if (not expect_handover) {
		log_msg := " (expecting NO handover)";
	}
	log("f_probe_for_handover starting: " & log_label & ": " & log_descr & log_msg);
	f_vty_transceive(BSCVTY, handover_vty_cmd);

	timer T := 2.0;
	T.start;

	alt {
	[] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr)) -> value rsl {
		var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[2].body.l3_info.payload);
		log("Rx L3 from net: ", l3);
		if (ischosen(l3.msgs.rrm.handoverCommand)) {
			var RslChannelNr new_chan_nr;
			var GsmArfcn arfcn;
			f_ChDesc2RslChanNr(l3.msgs.rrm.handoverCommand.channelDescription2,
					   new_chan_nr, arfcn);
			log("Handover to new chan ", new_chan_nr, " on ARFCN ", arfcn);
			log(l3.msgs.rrm.handoverCommand);

			/* Need to register for new lchan on new BTS -- it's either bts 1 or bts 2.  It doesn't really
			 * matter on which BTS it really is, we're not going to follow through an entire handover
			 * anyway. */
			f_rslem_register(0, new_chan_nr, RSL1_PROC);
			f_rslem_resume(RSL1_PROC);
			f_rslem_register(0, new_chan_nr, RSL2_PROC);
			f_rslem_resume(RSL2_PROC);

			if (expect_handover and not is_inter_bsc_handover) {
				setverdict(pass);
				log("f_probe_for_handover(" & log_label & "): Got RSL Handover Command as expected.");
			} else {
				setverdict(fail, "f_probe_for_handover(" & log_label & "): Expected none, but got RSL Handover Command. "
						 & log_label & ": " & log_descr);
			}

			log("f_probe_for_handover(" & log_label & "): Ending the test: Handover Failure stops the procedure.");
			/* osmo-bsc has triggered Handover. That's all we need to know for this test, reply with
			 * Handover Failure. */
			f_rsl_send_l3(ts_RRM_HandoverFailure('00'O));

			/* target BTS is told to release lchan again; don't care which BTS nor what messages. */
			f_sleep(0.5);
			RSL1.clear;
			RSL2.clear;
			log("f_probe_for_handover(" & log_label & "): done (got RSL Handover Command)");
			break;
		} else {
			repeat;
		}
		}
	[] BSSAP.receive(tr_BSSMAP_HandoverRequired) {
			if (expect_handover and is_inter_bsc_handover) {
				setverdict(pass);
				log("f_probe_for_handover(" & log_label & "): Got BSSMAP Handover Required as expected.");
			} else {
				setverdict(fail, "f_probe_for_handover(" & log_label & "): Expected none, but got BSSMAP Handover Required. "
						 & log_label & ": " & log_descr);
			}

			log("f_probe_for_handover(" & log_label & "): done (got BSSMAP Handover Required)");

			/* Note: f_tc_ho_neighbor_config_start() sets T7, the timeout for BSSMAP Handover Required, to
			 * 1 second. There is no legal way to quickly abort a handover after a BSSMAP Handover Required,
			 * setting a short timeout and waiting is the only way. */
			log("f_probe_for_handover(" & log_label & "): waiting for inter-BSC HO to time out...");
			f_sleep(1.5);
			log("f_probe_for_handover(" & log_label & "): ...done");

			break;
		}
	[] T.timeout {
		if (expect_handover) {
			setverdict(fail, "f_probe_for_handover(" & log_label & "): Expected Handover, but got none. "
					 & log_label & ": " & log_descr);
		} else {
			setverdict(pass);
			log("f_probe_for_handover(" & log_label & "): Got no Handover, as expected.");
		}
		log("f_probe_for_handover(" & log_label & "): done (got no Handover)");
		break;
		}
	}

	f_rslem_resume(RSL1_PROC);
	f_rslem_resume(RSL2_PROC);
	f_sleep(3.0);
	RSL.clear;

	log("f_probe_for_handover(" & log_label & "): done clearing");
}

/* Test the effect of various neighbor configuration scenarios:
 *
 * To avoid complexity, block off any actual handover operation, and always remain on the lchan at bts 0.
 * Reconfigure the neighbors for bts 0, trigger a Handover, and probe whether osmo-bsc does or doesn't start HO.
 */
private function f_tc_ho_neighbor_config_start() runs on MSC_ConnHdlr {
	g_pars := f_gen_test_hdlr_pars();
	var template PDU_BSSAP exp_compl := f_gen_exp_compl();
	var PDU_BSSAP ass_cmd := f_gen_ass_req();
	const OCT8 kc := '0001020304050607'O;

	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));

	/* Establish lchan at bts 0 */
	f_establish_fully(ass_cmd, exp_compl);

	/* Shorten the inter-BSC Handover timeout, to not wait so long for inter-BSC Handovers */
	f_vty_enter_cfg_network(BSCVTY);
	f_vty_transceive(BSCVTY, "timer T7 1");
	f_vty_transceive(BSCVTY, "end");
}

private function f_tc_ho_neighbor_config_1(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 1. No 'neighbor' config");
	f_bts_0_cfg(BSCVTY, {"no neighbors"});
	f_probe_for_handover("1.a", "HO to bts 1 works, implicitly listed as neighbor (legacy behavior when none are configured)",
			"handover any to arfcn 871 bsic 11",
			true);

	f_probe_for_handover("1.b", "HO to unknown cell does not start",
			"handover any to arfcn 13 bsic 39",
			false);

	f_probe_for_handover("1.c", "HO to 871-12 is ambiguous = error",
			"handover any to arfcn 871 bsic 12",
			false);

	f_probe_for_handover("1.d", "HO to 871-11 still works (verify that this test properly cleans up)",
			"handover any to arfcn 871 bsic 11",
			true);
}
testcase TC_ho_neighbor_config_1() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true, guard_timeout := 60.0);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_1));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 1.a */
	/* "failed" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by sending a Handover Failure message. */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:failed");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:attempted");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:failed");

	/* 1.b */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	/* 1.c */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	/* 1.d */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:failed");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:attempted");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:failed");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_neighbor_config_2(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 2. explicit local neighbor: 'neighbor bts 1'");
	f_bts_0_cfg(BSCVTY, {"neighbor bts 1"});
	f_sleep(0.5);

	f_probe_for_handover("2.a", "HO to bts 1 works, explicitly listed as neighbor",
			"handover any to arfcn 871 bsic 11",
			true);

	f_probe_for_handover("2.b", "HO to bts 2 doesn't work, not listed as neighbor",
			"handover any to arfcn 871 bsic 12",
			false);
}
testcase TC_ho_neighbor_config_2() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true, guard_timeout := 50.0);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_2));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 2.a */
	/* "failed" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by sending a Handover Failure message. */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:failed");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:attempted");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:failed");

	/* 2.b */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_neighbor_config_3(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 3. explicit local neighbor: 'neighbor bts 2'");
	f_bts_0_cfg(BSCVTY, {"no neighbors", "neighbor bts 2"});
	f_sleep(0.5);

	f_probe_for_handover("3.a", "HO to bts 1 doesn't work, not listed as neighbor",
			"handover any to arfcn 871 bsic 11",
			false);
	f_probe_for_handover("3.b", "HO to bts 2 works, explicitly listed as neighbor; no ambiguity because bts 3 is not listed as neighbor",
			"handover any to arfcn 871 bsic 12",
			true);
}
testcase TC_ho_neighbor_config_3() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true, guard_timeout := 50.0);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_3));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 3.a */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	/* 3.b */
	/* "failed" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by sending a Handover Failure message. */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:failed");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:attempted");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:failed");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_neighbor_config_4(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 4. explicit remote neighbor: 'neighbor lac 99 arfcn 123 bsic 45'");
	f_bts_0_cfg(BSCVTY, {"no neighbors", "neighbor lac 99 arfcn 123 bsic 45"});
	f_sleep(0.5);

	f_probe_for_handover("4.a", "HO to bts 1 doesn't work, not listed as neighbor",
			"handover any to arfcn 871 bsic 11",
			false);
	f_probe_for_handover("4.b", "HO to bts 2 doesn't work, not listed as neighbor",
			"handover any to arfcn 871 bsic 12",
			false);
	f_probe_for_handover("4.c", "HO to 123-45 triggers inter-BSC HO",
			"handover any to arfcn 123 bsic 45",
			true, true);
}
testcase TC_ho_neighbor_config_4() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true, guard_timeout := 50.0);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_4));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 4.a */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	/* 4.b */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	/* 4.c */
	/* "timeout" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by timing out after the Handover Required message */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:timeout");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:timeout");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_neighbor_config_5(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 5. explicit remote neighbor re-using ARFCN+BSIC: 'neighbor lac 99 arfcn 871 bsic 12'");
	f_bts_0_cfg(BSCVTY, {"no neighbors", "neighbor lac 99 arfcn 871 bsic 12"});
	f_sleep(0.5);

	f_probe_for_handover("5.a", "HO to 871-12 triggers inter-BSC HO (ignoring local cells with same ARFCN+BSIC)",
			"handover any to arfcn 871 bsic 12",
			true, true);
}
testcase TC_ho_neighbor_config_5() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_5));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 5 */
	/* "timeout" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by timing out after the Handover Required message */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:timeout");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:timeout");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_neighbor_config_6(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 6. config error: explicit local and remote neighbors with ambiguous ARFCN+BSIC:"
	    & " 'neighbor bts 2; neighbor lac 99 arfcn 871 bsic 12'");
	f_bts_0_cfg(BSCVTY, {"no neighbors", "neighbor bts 2", "neighbor lac 99 arfcn 871 bsic 12"});
	f_sleep(0.5);

	f_probe_for_handover("6.a", "HO to 871-12 is ambiguous = error",
			"handover any to arfcn 871 bsic 12",
			false);
}
testcase TC_ho_neighbor_config_6() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_6));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 6.a */
	/* "timeout" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by timing out after the Handover Required message */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:error");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

private function f_tc_ho_neighbor_config_7(charstring id) runs on MSC_ConnHdlr {
	f_tc_ho_neighbor_config_start();

	/*
	 * bts 0 ARFCN 871 BSIC 10
	 * bts 1 ARFCN 871 BSIC 11
	 * bts 2 ARFCN 871 BSIC 12
	 * bts 3 ARFCN 871 BSIC 12  serves as ambiguity for bts 2, re-using the ARFCN+BSIC
	 */

	log("f_tc_ho_neighbor_config: 7. explicit local and remote neighbors:"
	    & " 'neighbor bts 2; neighbor lac 99 arfcn 123 bsic 45'");
	f_bts_0_cfg(BSCVTY, {"no neighbors", "neighbor bts 2", "neighbor lac 99 arfcn 123 bsic 45"});
	f_sleep(0.5);

	f_probe_for_handover("7.a", "HO to 871-12 does HO to bts 2",
			"handover any to arfcn 871 bsic 12",
			true);
	f_probe_for_handover("7.b", "HO to 123-45 triggers inter-BSC HO",
			"handover any to arfcn 123 bsic 45",
			true, true);
}
testcase TC_ho_neighbor_config_7() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	f_init(3, true, guard_timeout := 50.0);
	f_sleep(1.0);
	f_ctrs_bsc_and_bts_init();
	vc_conn := f_start_handler(refers(f_tc_ho_neighbor_config_7));
	vc_conn.done;

	/* f_tc_ho_neighbor_config_start() */
	f_ctrs_bsc_and_bts_add(0, "assignment:attempted");
	f_ctrs_bsc_and_bts_add(0, "assignment:completed");

	/* 7.a */
	/* "failed" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by sending a Handover Failure message. */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:failed");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:attempted");
	f_ctrs_bsc_and_bts_add(0, "intra_bsc_ho:failed");

	/* 7.b */
	/* "timeout" means a handover was triggered and started (which is all this test aims for) and the test ended the
	 * handover quickly by timing out after the Handover Required message */
	f_ctrs_bsc_and_bts_add(0, "handover:attempted");
	f_ctrs_bsc_and_bts_add(0, "handover:timeout");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:attempted");
	f_ctrs_bsc_and_bts_add(0, "interbsc_ho_out:timeout");

	f_ctrs_bsc_and_bts_verify();
	f_shutdown_helper();
}

/* OS#3041: Open and close N connections in a normal fashion, and expect no
 * BSSMAP Reset just because of that. */
testcase TC_bssap_rlsd_does_not_cause_bssmap_reset() runs on test_CT {
	var default d;
	var integer i;
	var DchanTuple dt;

	f_init();

	/* Wait for initial BSSMAP Reset to pass */
	f_sleep(4.0);

	d := activate(no_bssmap_reset());

	/* Setup up a number of connections and RLSD them again from the MSC
	 * side. In the buggy behavior, the fourth one triggers BSSMAP Reset.
	 * Let's do it some more times for good measure. */
	for (i := 0; i < 4; i := i+1) {
		/* Since we're doing a lot of runs, give each one a fresh
		 * T_guard from the top. */
		T_guard.start;

		/* Setup a BSSAP connection and clear it right away. This is
		 * the MSC telling the BSC about a planned release, it's not an
		 * erratic loss of a connection. */
		dt := f_est_dchan(int2oct(i,1), 23+i, '00010203040506'O);

		/* MSC disconnects (RLSD). */
		BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	}

	/* In the buggy behavior, a timeout of 2 seconds happens between above
	 * trigger (logs "SIGTRAN connection down, reconnecting...") and the
	 * actual BSSMAP Reset. Wait a bit longer just to make sure. */
	f_sleep(4.0);

	deactivate(d);
	f_shutdown_helper();
}

/* OS#3041: Open and close N connections in a normal fashion, and expect no
 * BSSMAP Reset just because of that. Invoke the release by a BSSMAP Clear from
 * the MSC. */
testcase TC_bssmap_clear_does_not_cause_bssmap_reset() runs on test_CT {
	var default d;
	var integer i;
	var DchanTuple dt;
	var BSSAP_N_DATA_ind rx_di;
	var myBSSMAP_Cause cause_val := GSM0808_CAUSE_CALL_CONTROL;
	var BssmapCause cause := enum2int(cause_val);

	f_init();

	/* Wait for initial BSSMAP Reset to pass */
	f_sleep(4.0);

	d := activate(no_bssmap_reset());

	/* Setup up a number of connections and RLSD them again from the MSC
	 * side. In the buggy behavior, the fourth one triggers BSSMAP Reset.
	 * Let's do it some more times for good measure. */
	for (i := 0; i < 8; i := i+1) {
		/* Since we're doing a lot of runs, give each one a fresh
		 * T_guard from the top. */
		T_guard.start;

		/* Setup a BSSAP connection and clear it right away. This is
		 * the MSC telling the BSC about a planned release, it's not an
		 * erratic loss of a connection. */
		dt := f_est_dchan(int2oct(i,1), 23+i, '00010203040506'O);

		/* Instruct BSC to clear channel */
		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

		/* expect BSC to disable the channel */
		f_exp_chan_rel_and_clear(dt, 0);
	}

	/* In the buggy behavior, a timeout of 2 seconds happens between above
	 * trigger (logs "SIGTRAN connection down, reconnecting...") and the
	 * actual BSSMAP Reset. Wait a bit longer just to make sure. */
	f_sleep(4.0);

	deactivate(d);
	f_shutdown_helper();
}

/* OS#3041: Open and close N connections in a normal fashion, and expect no
 * BSSMAP Reset just because of that. Close connections from the MS side with a
 * Release Ind on RSL. */
testcase TC_ms_rel_ind_does_not_cause_bssmap_reset() runs on test_CT {
	var default d;
	var integer i;
	var DchanTuple dt;
	var BSSAP_N_DATA_ind rx_di;
	var integer j;

	f_init();

	/* Wait for initial BSSMAP Reset to pass */
	f_sleep(4.0);

	d := activate(no_bssmap_reset());

	/* Setup up a number of connections and RLSD them again from the MSC
	 * side. In the buggy behavior, the fourth one triggers BSSMAP Reset.
	 * Let's do it some more times for good measure. */
	for (i := 0; i < 8; i := i+1) {
		/* Since we're doing a lot of runs, give each one a fresh
		 * T_guard from the top. */
		T_guard.start;

		/* Setup a BSSAP connection and clear it right away. This is
		 * the MSC telling the BSC about a planned release, it's not an
		 * erratic loss of a connection. */
		dt := f_est_dchan('23'O, 23, '00010203040506'O);

		/* simulate RLL REL IND */
		f_ipa_tx(0, ts_RSL_REL_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0))));

		/* expect Clear Request on MSC side */
		BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearRequest)) -> value rx_di;

		/* Instruct BSC to clear channel */
		var BssmapCause cause := bit2int(rx_di.userData.pdu.bssmap.clearRequest.cause.causeValue);
		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

		/* expect BSC to disable the channel */
		f_exp_chan_rel_and_clear(dt, 0);
	}

	/* In the buggy behavior, a timeout of 2 seconds happens between above
	 * trigger (logs "SIGTRAN connection down, reconnecting...") and the
	 * actual BSSMAP Reset. Wait a bit longer just to make sure. */
	f_sleep(4.0);

	deactivate(d);
	f_shutdown_helper();
}

/***********************************************************************
 * IPA style dynamic PDCH
 ***********************************************************************/

private function f_dyn_ipa_pdch_act(integer bts_nr, integer trx_nr, integer ts_nr,
				    template (omit) RSL_Cause nack := omit)
runs on test_CT {
	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(ts_nr));
	var RSL_Message rsl_unused;
	/* ask BSC via VTY to activate a given IPA style chan as PDCH */
	f_vty_ts_action("pdch activate", bts_nr, trx_nr, ts_nr);
	/* expect the BSC to issue the related RSL command */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_IPA_PDCH_ACT(chan_nr));
	if (istemplatekind(nack, "omit")) {
		/* respond with a related acknowledgement */
		f_ipa_tx(0, ts_RSL_IPA_PDCH_ACT_ACK(chan_nr, ts_RSL_IE_FrameNumber(2342)));
	} else {
		f_ipa_tx(0, ts_RSL_IPA_PDCH_ACT_NACK(chan_nr, valueof(nack)));
	}
}

private function f_dyn_ipa_pdch_deact(integer bts_nr, integer trx_nr, integer ts_nr,
				      template (omit) RSL_Cause nack := omit)
runs on test_CT {
	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(ts_nr));
	var RSL_Message rsl_unused;
	/* ask BSC via VTY to activate a given IPA style chan as PDCH */
	f_vty_ts_action("pdch deactivate", bts_nr, trx_nr, ts_nr);
	/* expect the BSC to issue the related RSL command */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_IPA_PDCH_DEACT(chan_nr));
	if (istemplatekind(nack, "omit")) {
		/* respond with a related acknowledgement */
		f_ipa_tx(0, ts_RSL_IPA_PDCH_DEACT_ACK(chan_nr));
	} else {
		f_ipa_tx(0, ts_RSL_IPA_PDCH_DEACT_NACK(chan_nr, valueof(nack)));
	}
}

private function f_ts_dyn_mode_get(integer bts_nr, integer trx_nr, integer ts_nr)
runs on test_CT return charstring {
	var charstring cmd, resp;
	cmd := "show timeslot "&int2str(bts_nr)&" "&int2str(trx_nr)&" "&int2str(ts_nr);
	return f_vty_transceive_match_regexp_retry(BSCVTY, cmd, "*\((*)\)*", 0, 4, 1.0);
}

private function f_ts_dyn_mode_assert(integer bts_nr, integer trx_nr, integer ts_nr,
					template charstring exp)
runs on test_CT {
	var charstring mode := f_ts_dyn_mode_get(bts_nr, trx_nr, ts_nr);
	if (not match(mode, exp)) {
		setverdict(fail, "Unexpected TS Mode: ", mode);
		mtc.stop;
	}
}

private function f_ts_set_chcomb(integer bts_nr, integer trx_nr, integer ts_nr, charstring chcomb)
runs on test_CT {
	f_vty_enter_cfg_ts(BSCVTY, bts_nr, trx_nr, ts_nr);
	f_vty_transceive(BSCVTY, "phys_chan_config " & chcomb);
	f_vty_transceive(BSCVTY, "end");
}

private const charstring TCHF_MODE := "TCH/F mode";
private const charstring TCHH_MODE := "TCH/H mode";
private const charstring PDCH_MODE := "PDCH mode";
private const charstring NONE_MODE := "NONE mode";

/* Test IPA PDCH activation / deactivation triggered by VTY */
testcase TC_dyn_pdch_ipa_act_deact() runs on test_CT {
	var RSL_Message rsl_unused;

	/* change Timeslot 6 before f_init() starts RSL */
	f_init_vty();
	f_ts_set_chcomb(0, 0, 6, "TCH/F_PDCH");
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1, false);
	f_sleep(1.0);

	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(6));

	log("TCH/F_PDCH pchan starts out in TCH/F mode:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);
	/* The BSC will activate the dynamic PDCH by default, so confirm that */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_IPA_PDCH_ACT(chan_nr));
	f_ipa_tx(0, ts_RSL_IPA_PDCH_ACT_ACK(chan_nr, ts_RSL_IE_FrameNumber(2342)));
	f_sleep(1.0);
	log("TCH/F_PDCH pchan, PDCH ACT was ACKed, so now in PDCH mode:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, PDCH_MODE);

	/* De-activate it via VTY */
	f_dyn_ipa_pdch_deact(0, 0, chan_nr.tn);
	f_sleep(1.0);
	log("TCH/F_PDCH pchan, PDCH DEACT via VTY, so now back in TCH/F mode:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);

	/* re-activate it via VTY */
	f_dyn_ipa_pdch_act(0, 0, chan_nr.tn);
	f_sleep(1.0);
	log("TCH/F_PDCH pchan, PDCH ACT via VTY, so now in PDCH mode:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, PDCH_MODE);

	/* and finally de-activate it again */
	f_dyn_ipa_pdch_deact(0, 0, chan_nr.tn);
	f_sleep(1.0);
	log("TCH/F_PDCH pchan, PDCH DEACT via VTY, so now back in TCH/F mode:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);

	/* clean up config */
	f_ts_set_chcomb(0, 0, 6, "PDCH");

	f_shutdown_helper();
}

/* Test IPA PDCH activation NACK */
testcase TC_dyn_pdch_ipa_act_nack() runs on test_CT {
	var RSL_Message rsl_unused;

	/* change Timeslot 6 before f_init() starts RSL */
	f_init_vty();
	f_ts_set_chcomb(0, 0, 6, "TCH/F_PDCH");
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1, false);
	f_sleep(1.0);

	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(6));

	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);
	/* The BSC will activate the dynamic PDCH by default, so confirm that */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_IPA_PDCH_ACT(chan_nr));
	f_ipa_tx(0, ts_RSL_IPA_PDCH_ACT_ACK(chan_nr, ts_RSL_IE_FrameNumber(2342)));
	f_sleep(1.0);
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, PDCH_MODE);

	/* De-activate it via VTY */
	f_dyn_ipa_pdch_deact(0, 0, chan_nr.tn);
	f_sleep(1.0);
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);

	/* re-activate it via VTY, but fail that; check BSC still assumes TCH/F mode */
	f_dyn_ipa_pdch_act(0, 0, chan_nr.tn, RSL_ERR_EQUIPMENT_FAIL);
	f_sleep(1.0);
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);

	/* clean up config */
	f_ts_set_chcomb(0, 0, 6, "PDCH");

	f_shutdown_helper();
}


/***********************************************************************
 * Osmocom style dynamic PDCH
 ***********************************************************************/

private function f_dyn_osmo_pdch_act(integer bts_nr, integer trx_nr, integer ts_nr,
				     template (omit) RSL_Cause nack := omit)
runs on test_CT {
	var RslChannelNr chan_nr := valueof(t_RslChanNr_PDCH(ts_nr));
	var RSL_Message rsl_unused;
	/* ask BSC via VTY to activate a given IPA style chan as PDCH */
	/* FIXME: no VTY command to activate Osmocom PDCH !! */
	/* expect the BSC to issue the related RSL command */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_CHAN_ACT(chan_nr, ?));
	if (istemplatekind(nack, "omit")) {
		/* respond with a related acknowledgement */
		f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(chan_nr, 2342));
	} else {
		f_ipa_tx(0, ts_RSL_CHAN_ACT_NACK(chan_nr, valueof(nack)));
	}
}

private function f_dyn_osmo_pdch_deact(integer bts_nr, integer trx_nr, integer ts_nr,
				       template (omit) RSL_Cause nack := omit)
runs on test_CT {
	var RslChannelNr chan_nr := valueof(t_RslChanNr_PDCH(ts_nr));
	var RSL_Message rsl_unused;
	/* ask BSC via VTY to activate a given IPA style chan as PDCH */
	/* FIXME: no VTY command to activate Osmocom PDCH !! */
	/* expect the BSC to issue the related RSL command */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_RF_CHAN_REL(chan_nr));
	if (istemplatekind(nack, "omit")) {
		/* respond with a related acknowledgement */
		f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(chan_nr));
	} else {
		//f_ipa_tx(0, ts_RSL_RF_CHAN_REL_NACK(chan_nr, valueof(nack)));
	}
}

/* Test Osmocom dyn PDCH activation / deactivation triggered by VTY */
testcase TC_dyn_pdch_osmo_act_deact() runs on test_CT {
	var RSL_Message rsl_unused;

	/* change Timeslot 6 before f_init() starts RSL */
	f_init_vty();
	f_ts_set_chcomb(0, 0, 6, "TCH/F_TCH/H_PDCH");
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1, false);
	f_sleep(1.0);

	var RslChannelNr chan_nr := valueof(t_RslChanNr_PDCH(6));

	log("TCH/F_TCH/H_PDCH pchan starts out in disabled mode:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, NONE_MODE);
	/* The BSC will activate the dynamic PDCH by default, so confirm that */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_CHAN_ACT_PDCH(chan_nr, ?));

	f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(chan_nr, 2342));
	f_sleep(1.0);
	log("TCH/F_TCH/H_PDCH requested to PDCH ACT on startup, which was ACKed, so now in PDCH:");
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, PDCH_MODE);

	/* clean up config */
	f_ts_set_chcomb(0, 0, 6, "PDCH");

	f_shutdown_helper();
}

/* Test Osmocom dyn PDCH activation NACK behavior */
testcase TC_dyn_pdch_osmo_act_nack() runs on test_CT {
	var RSL_Message rsl_unused;

	/* change Timeslot 6 before f_init() starts RSL */
	f_init_vty();
	f_ts_set_chcomb(0, 0, 6, "TCH/F_TCH/H_PDCH");
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1, false);
	f_sleep(1.0);

	var RslChannelNr chan_nr := valueof(t_RslChanNr_PDCH(6));

	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, NONE_MODE);
	/* The BSC will activate the dynamic PDCH by default, so confirm that */
	rsl_unused := f_exp_ipa_rx(0, tr_RSL_CHAN_ACT_PDCH(chan_nr, ?));

	/* NACK this activation and expect the "show timeslot" mode still to be NONE */
	f_ipa_tx(0, ts_RSL_CHAN_ACT_NACK(chan_nr, RSL_ERR_EQUIPMENT_FAIL));
	f_sleep(1.0);
	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, NONE_MODE);

	/* clean up config */
	f_ts_set_chcomb(0, 0, 6, "PDCH");

	f_shutdown_helper();
}

testcase TC_chopped_ipa_ping() runs on test_CT {
	const Integers bsc_ipa_ports := {mp_bsc_rsl_port, mp_bsc_oml_port, mp_bsc_ctrl_port};
	for (var integer i := 0; i < lengthof(bsc_ipa_ports); i := i + 1) {
		IPA_Testing.f_run_TC_chopped_ipa_ping(mp_bsc_ip, bsc_ipa_ports[i], CONNECT_TO_SERVER);
	}
	f_shutdown_helper();
}

testcase TC_chopped_ipa_payload() runs on test_CT {
	const Integers bsc_ipa_ports := {mp_bsc_rsl_port, mp_bsc_oml_port
					/* TODO: mp_bsc_ctrl_port does not work yet */};
	for (var integer i := 0; i < lengthof(bsc_ipa_ports); i := i + 1) {
		IPA_Testing.f_run_TC_chopped_ipa_payload(mp_bsc_ip, bsc_ipa_ports[i], CONNECT_TO_SERVER);
	}
	f_shutdown_helper();
}

/* Verify the BSC sends the MS Power Parameters IE during CHAN ACT to make sure
   the BTS does autonomous MS power control loop */
testcase TC_assignment_verify_ms_power_params_ie() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	//pars.encr := valueof(t_EncrParams('01'O, f_rnd_octstring(8)));
	pars.exp_ms_power_params := true;

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_assignment_fr_a5), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/***********************************************************************
 * MSC Pooling
 ***********************************************************************/

function f_tmsi_nri(integer nri_v, octetstring base_tmsi := '42000023'O, integer nri_bitlen := 10) return octetstring
{
	return int2oct( oct2int(base_tmsi) + bit2int( (int2bit(nri_v, 32) << ( 24 - nri_bitlen)) ),
	                4);
}

template MobileIdentityLV ts_MI_TMSI_NRI_LV(integer nri_v, integer nri_bitlen := 10) :=
	ts_MI_TMSI_LV(tmsi := f_tmsi_nri(nri_v, nri_bitlen := nri_bitlen));

private function f_expect_lchan_rel(RSL_DCHAN_PT rsl) runs on MSC_ConnHdlr {
	interleave {
	[] rsl.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_RELEASE)) {
			f_logp(BSCVTY, "Got RSL RR Release");
		}
	[] rsl.receive(tr_RSL_DEACT_SACCH(g_chan_nr)) {
			f_logp(BSCVTY, "Got RSL Deact SACCH");
		}
	[] rsl.receive(tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL)) {
			f_logp(BSCVTY, "Got RSL RF Chan Rel, sending Rel Ack");
			rsl.send(ts_RSL_RF_CHAN_REL_ACK(g_chan_nr));
			break;
		}
	}
}

private function f_perform_clear(RSL_DCHAN_PT rsl) runs on MSC_ConnHdlr {
	f_logp(BSCVTY, "MSC instructs BSC to clear channel");
	BSSAP.send(ts_BSSMAP_ClearCommand(0));
	interleave {
	[] rsl.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_RELEASE)) {
			f_logp(BSCVTY, "Got RSL RR Release");
		}
	[] rsl.receive(tr_RSL_DEACT_SACCH(g_chan_nr)) {
			f_logp(BSCVTY, "Got RSL Deact SACCH");
		}
	[] BSSAP.receive(tr_BSSMAP_ClearComplete) {
			f_logp(BSCVTY, "Got BSSMAP Clear Complete");
			/* Also drop the SCCP connection */
			BSSAP.send(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_REQ);
		}
	[] rsl.receive(tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL)) {
			f_logp(BSCVTY, "Got RSL RF Chan Rel, sending Rel Ack");
			rsl.send(ts_RSL_RF_CHAN_REL_ACK(g_chan_nr));
		}
	}
}

private function f_perform_compl_l3(RSL_DCHAN_PT rsl, template PDU_ML3_MS_NW l3_info, boolean do_clear := true, boolean expect_bssmap_l3 := true)
runs on MSC_ConnHdlr {
	timer T := 10.0;
	var octetstring l3_enc := enc_PDU_ML3_MS_NW(valueof(l3_info));

	f_logp(BSCVTY, "establish channel, send Complete Layer 3 Info");
	f_create_bssmap_exp(l3_enc);

	/* RSL_Emulation.f_chan_est() on rsl:
	 * This is basically code dup with s/RSL/rsl from:
	 * RSL_Emulation.f_chan_est(g_pars.ra, l3_enc, g_pars.link_id, g_pars.fn);
	 */
	var RSL_Message rx_rsl;
	var GsmRrMessage rr;

	/* request a channel to be established */
	rsl.send(ts_RSLDC_ChanRqd(g_pars.ra, g_pars.fn));
	/* expect immediate assignment.
	 * Code dup with s/RSL/rsl from:
	 * rx_rsl := f_rx_or_fail(tr_RSL_IMM_ASSIGN);
	 */
	timer Tt := 10.0;

	/* request a channel to be established */
	Tt.start;
	alt {
		[] rsl.receive(tr_RSL_IMM_ASSIGN) -> value rx_rsl {
			Tt.stop;
		}
		[] rsl.receive {
			setverdict(fail, "Unexpected RSL message on DCHAN");
			mtc.stop;
		}
		[] Tt.timeout {
			setverdict(fail, "Timeout waiting for RSL on DCHAN");
			mtc.stop;
		}
	}
	rr := dec_GsmRrMessage(rx_rsl.ies[1].body.full_imm_ass_info.payload);
	g_chan_nr := rr.payload.imm_ass.chan_desc.chan_nr;
	rsl.send(ts_RSL_EST_IND(g_chan_nr, valueof(g_pars.link_id), l3_enc));


	if (expect_bssmap_l3) {
		f_logp(BSCVTY, "expect BSSAP Complete Layer 3 Info at MSC");
		var template PDU_BSSAP exp_l3_compl;
		exp_l3_compl := tr_BSSMAP_ComplL3()
		if (g_pars.aoip == false) {
			exp_l3_compl.pdu.bssmap.completeLayer3Information.codecList := omit;
		} else {
			exp_l3_compl.pdu.bssmap.completeLayer3Information.codecList := ?;
		}

		var PDU_BSSAP bssap;
		T.start;
		alt {
		[] BSSAP.receive(exp_l3_compl) -> value bssap {
			f_logp(BSCVTY, "received expected Complete Layer 3 Info at MSC");
			log("rx exp_l3_compl = ", bssap);
			}
		[] BSSAP.receive(tr_BSSMAP_ComplL3) {
			Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Received non-matching COMPLETE LAYER 3 INFORMATION");
			}
		[] T.timeout {
			Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Timeout waiting for COMPLETE LAYER 3 INFORMATION");
			}
		}

		/* start ciphering, if requested */
		if (ispresent(g_pars.encr)) {
			f_logp(BSCVTY, "start ciphering");
			f_cipher_mode(g_pars.encr.enc_alg, g_pars.encr.enc_key);
		}
	}

	if (do_clear) {
		f_perform_clear(rsl);
	}
	setverdict(pass);
	f_sleep(1.0);
}

private function f_tc_mscpool_compl_l3(charstring id) runs on MSC_ConnHdlr {
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	if (g_pars.mscpool.rsl_idx == 0) {
		f_perform_compl_l3(RSL, g_pars.mscpool.l3_info);
	} else if (g_pars.mscpool.rsl_idx == 1) {
		f_perform_compl_l3(RSL1, g_pars.mscpool.l3_info);
	} else if (g_pars.mscpool.rsl_idx == 2) {
		f_perform_compl_l3(RSL2, g_pars.mscpool.l3_info);
	}
}

/* Various Complete Layer 3 by IMSI all end up with the first MSC, because the other MSCs are not connected. */
private function f_tc_mscpool_L3Compl_on_1_msc(charstring id) runs on MSC_ConnHdlr {
	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	f_perform_compl_l3(RSL, ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_IMSI_LV('001010000000001'H)), '00F110'O) );
	f_perform_compl_l3(RSL, ts_CM_SERV_REQ(CM_TYPE_MO_SMS, valueof(ts_MI_IMSI_LV('001010000000002'H))) );
	f_perform_compl_l3(RSL, ts_PAG_RESP(valueof(ts_MI_IMSI_LV('001010000000003'H))) );
	f_perform_compl_l3(RSL, ts_ML3_MO_MM_IMSI_DET_Ind(valueof(ts_MI_IMSI_LV('001010000000004'H))) );
}
testcase TC_mscpool_L3Compl_on_1_msc() runs on test_CT {

	f_init(1, true);
	f_sleep(1.0);
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_ctrs_msc_init();

	vc_conn := f_start_handler(refers(f_tc_mscpool_L3Compl_on_1_msc), pars);
	vc_conn.done;

	f_ctrs_msc_expect(0, "mscpool:subscr:new", 4);
	f_shutdown_helper();
}

/* Three Layer 3 Complete by IMSI are round-robin'ed across two connected MSCs */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_L3Complete_by_imsi_round_robin() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 2);
	f_sleep(1.0);

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_IMSI_LV('001010000000001'H)), '00F110'O));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars2.mscpool.rsl_idx := 1;
	pars2.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, valueof(ts_MI_IMSI_LV('001010000000002'H))));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:new");

	/* Test round-robin wrap to the first MSC */
	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars3.mscpool.rsl_idx := 2;
	pars3.mscpool.l3_info := valueof(ts_PAG_RESP(valueof(ts_MI_IMSI_LV('001010000000003'H))));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");
	f_shutdown_helper();
}

/* Three LU by TMSI are round-robin'ed across two connected MSCs, because they contain the NULL-NRI 0
 * (configured in osmo-bsc.cfg). */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_LU_by_tmsi_null_nri_0_round_robin() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 2);
	f_sleep(1.0);

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(0)), '00F110'O));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:reattach");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars2.mscpool.rsl_idx := 1;
	pars2.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(0)), '00F110'O));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:reattach");

	/* Test round-robin wrap to the first MSC */
	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars3.mscpool.rsl_idx := 2;
	pars3.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(0)), '00F110'O));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:reattach");
	f_shutdown_helper();
}

/* Three LU by TMSI are round-robin'ed across two connected MSCs, because they contain the NULL-NRI 1
 * (configured in osmo-bsc.cfg). In this case, one of the MSC also has the NULL-NRI as part of its owned NRIs, but the
 * NULL-NRI setting is stronger than that. */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_LU_by_tmsi_null_nri_1_round_robin() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 2);
	f_sleep(1.0);

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(1)), '00F110'O));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:reattach");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars2.mscpool.rsl_idx := 1;
	pars2.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(1)), '00F110'O));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:reattach");

	/* Test round-robin wrap to the first MSC */
	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars3.mscpool.rsl_idx := 2;
	pars3.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(1)), '00F110'O));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:reattach");
	f_shutdown_helper();
}

/* Three Layer 3 Complete by TMSI are round-robin'ed across two connected MSCs, because they contain an NRI not
 * assigned to any MSC (configured in osmo-bsc.cfg). */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_L3Complete_by_tmsi_unassigned_nri_round_robin() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 2);
	f_sleep(1.0);

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	/* An NRI that is not assigned to any MSC */
	pars1.mscpool.l3_info := valueof(ts_ML3_MO_MM_IMSI_DET_Ind(valueof(ts_MI_TMSI_NRI_LV(1023))));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars2.mscpool.rsl_idx := 1;
	/* An NRI that is not assigned to any MSC */
	pars2.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(768)), '00F110'O));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:new");

	/* Test round-robin wrap to the first MSC */
	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars3.mscpool.rsl_idx := 2;
	/* An NRI that is not assigned to any MSC */
	pars3.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_SS_ACT, valueof(ts_MI_TMSI_NRI_LV(819))));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");
	f_shutdown_helper();
}

/* Three Layer 3 Complete by TMSI are round-robin'ed across two connected MSCs, because they contain an NRI
 * assigned to an MSC that is currently not connected (configured in osmo-bsc.cfg). */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_L3Complete_by_tmsi_valid_nri_msc_not_connected_round_robin() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 2);
	f_sleep(1.0);

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	/* An NRI that is assigned to an unconnected MSC */
	pars1.mscpool.l3_info := valueof(ts_PAG_RESP(valueof(ts_MI_TMSI_NRI_LV(512))));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_add(2, "mscpool:subscr:attach_lost");
	f_ctrs_msc_add(0, "mscpool:subscr:new");
	f_ctrs_msc_verify();

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars2.mscpool.rsl_idx := 1;
	/* An NRI that is assigned to an unconnected MSC */
	pars2.mscpool.l3_info := valueof(ts_ML3_MO_MM_IMSI_DET_Ind(valueof(ts_MI_TMSI_NRI_LV(767))));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_add(2, "mscpool:subscr:attach_lost");
	f_ctrs_msc_add(1, "mscpool:subscr:new");
	f_ctrs_msc_verify();

	/* Test round-robin wrap to the first MSC */
	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars3.mscpool.rsl_idx := 2;
	/* An NRI that is assigned to an unconnected MSC */
	pars3.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(750)), '00F110'O));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_add(2, "mscpool:subscr:attach_lost");
	f_ctrs_msc_add(0, "mscpool:subscr:new");
	f_ctrs_msc_verify();
	f_shutdown_helper();
}

/* Three Layer 3 Complete by TMSI with valid NRI for the second MSC are all directed to the second MSC (configured in
 * osmo-bsc.cfg). */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_L3Complete_by_tmsi_valid_nri_1() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 2);
	f_sleep(1.0);

	/* All TMSIs in this test point at the second MSC, set the round robin to point at the first MSC to make sure
	 * this is not using round-robin. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars1.mscpool.rsl_idx := 0;
	/* An NRI of the second MSC's range (256-511) */
	pars1.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_SMS, valueof(ts_MI_TMSI_NRI_LV(256))));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:known");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars2.mscpool.rsl_idx := 1;
	/* An NRI of the second MSC's range (256-511) */
	pars2.mscpool.l3_info := valueof(ts_PAG_RESP(valueof(ts_MI_TMSI_NRI_LV(260))));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:known");

	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars3.mscpool.rsl_idx := 2;
	/* An NRI of the second MSC's range (256-511) */
	pars3.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(511)), '00F110'O));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:known");
	f_shutdown_helper();
}

/* Layer 3 Complete by TMSI with valid NRI for the third MSC are directed to the third MSC (configured in osmo-bsc.cfg),
 * while a round-robin remains unaffected by that. */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_L3Complete_by_tmsi_valid_nri_2() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 3);
	f_sleep(1.0);

	/* All TMSIs in this test point at the third MSC, set the round robin to point at the second MSC to make sure
	 * this is not using round-robin. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 1");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 2);
	pars1.mscpool.rsl_idx := 0;
	/* An NRI of the third MSC's range (512-767) */
	pars1.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_SMS, valueof(ts_MI_TMSI_NRI_LV(512))));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(2, "mscpool:subscr:known");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 2);
	pars2.mscpool.rsl_idx := 1;
	/* An NRI of the third MSC's range (512-767) */
	pars2.mscpool.l3_info := valueof(ts_PAG_RESP(valueof(ts_MI_TMSI_NRI_LV(678))));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(2, "mscpool:subscr:known");

	/* The above forwardings to third MSC have not affected the round robin, which still points at the second MSC */
	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars3.mscpool.rsl_idx := 2;
	pars3.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_IMSI_LV('001010000000013'H)), '00F110'O));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:new");
	f_shutdown_helper();
}

/* LU with a TMSI but indicating a different PLMN in its previous LAI: ignore the NRI. */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_LU_by_tmsi_from_other_PLMN() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 3);
	f_sleep(1.0);

	/* The TMSIs in this test points at the second MSC, but since it is from a different PLMN, round-robin is used
	 * instead, and hits msc 0. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	/* An NRI of the second MSC's range (256-511), but a PLMN that doesn't match with osmo-bsc.cfg */
	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(260)), '99F999'O));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");

	/* An NRI of the third MSC's range (512-767) and a matching PLMN gets directed by NRI. */
	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 2);
	pars2.mscpool.rsl_idx := 1;
	pars2.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_TMSI_NRI_LV(555)), '00F110'O));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(2, "mscpool:subscr:known");
	f_shutdown_helper();
}

/* Make sure that whichever MSC paged a subscriber will also get the Paging Response. Page by IMSI, which would be
 * round-robined to another MSC, to make sure the Paging->Response relation is stronger than the NRI->MSC mapping. */
private function f_tc_mscpool_paging_imsi(charstring id) runs on MSC_ConnHdlr {
	var template BSSMAP_FIELD_CellIdentificationList cid_list := { cIl_CI := { ts_BSSMAP_CI_CI(0) } };
	//cid_list := { cIl_allInBSS := ''O };
	var RSL_ChanNeeded rsl_chneed := RSL_CHANNEED_SDCCH;
	var template BSSMAP_IE_ChannelNeeded bssmap_chneed := ts_BSSMAP_IE_ChanNeeded(int2bit(enum2int(valueof(rsl_chneed)),2));
	var BSSAP_N_UNITDATA_req paging;
	var hexstring imsi := '001010000000123'H;

	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);

	paging := valueof(ts_BSSAP_UNITDATA_req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
						valueof(ts_BSSMAP_Paging(imsi, cid_list, omit, bssmap_chneed))));
	BSSAP.send(paging);

	/* Register any RSL conn so that the Paging Command gets received here. With the current RSL_Emulation's main()
	 * handling of '[bts_role] IPA_PT.receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD()))' it doesn't matter at all which
	 * channel number is picked here. */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(0, RSL_CHAN_NR_INVALID));
	f_rslem_register(0, new_chan_nr);
	RSL.receive(tr_RSL_PAGING_CMD(tr_MI_IMSI(imsi)));
	f_rslem_unregister(0, new_chan_nr);

	/* Despite the round robin pointing at the second MSC ('roundrobin next 1'), the earlier Paging for the same IMSI
	 * causes this Paging Response to go to the first MSC (bssap_idx := 0). */
	f_perform_compl_l3(RSL, ts_PAG_RESP(valueof(ts_MI_IMSI_LV(imsi))) );
	f_sleep(1.0);
}
testcase TC_mscpool_paging_and_response_imsi() runs on test_CT {
	f_init(nr_bts := 1, handler_mode := true, nr_msc := 3);
	f_sleep(1.0);

	/* Testing a Paging on the first MSC to get a Paging Response back to the first MSC. Set round robin to the
	 * second MSC to make sure we're getting the Paging logic, not a coincidental round robin match. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 1");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.sccp_addr_bsc := g_bssap[pars1.mscpool.bssap_idx].sccp_addr_peer;
	pars1.sccp_addr_msc := g_bssap[pars1.mscpool.bssap_idx].sccp_addr_own;
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_paging_imsi), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:paged");
	f_shutdown_helper();
}

/* Make sure that whichever MSC paged a subscriber will also get the Paging Response.  Page by TMSI with an NRI value
 * that matches a different MSC, to make sure the Paging->Response relation is stronger than the NRI->MSC mapping. */
private function f_tc_mscpool_paging_tmsi(charstring id) runs on MSC_ConnHdlr {
	var template BSSMAP_FIELD_CellIdentificationList cid_list := { cIl_CI := { ts_BSSMAP_CI_CI(0) } };
	//cid_list := { cIl_allInBSS := ''O };
	var RSL_ChanNeeded rsl_chneed := RSL_CHANNEED_SDCCH;
	var template BSSMAP_IE_ChannelNeeded bssmap_chneed := ts_BSSMAP_IE_ChanNeeded(int2bit(enum2int(valueof(rsl_chneed)),2));
	var integer nri_v := 300; /* <-- second MSC's NRI */
	var octetstring tmsi := f_tmsi_nri(nri_v);
	var BSSAP_N_UNITDATA_req paging;

	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);

	paging := valueof(ts_BSSAP_UNITDATA_req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
						valueof(ts_BSSMAP_Paging('001010000000011'H, cid_list, tmsi, bssmap_chneed))));
	BSSAP.send(paging);

	/* Register any RSL conn so that the Paging Command gets received here. With the current RSL_Emulation's main()
	 * handling of '[bts_role] IPA_PT.receive(tr_ASP_RSL_UD(tr_RSL_PAGING_CMD()))' it doesn't matter at all which
	 * channel number is picked here. */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(0, RSL_CHAN_NR_INVALID));
	f_rslem_register(0, new_chan_nr);
	RSL.receive(tr_RSL_PAGING_CMD(t_MI_TMSI(tmsi)));
	f_rslem_unregister(0, new_chan_nr);

	/* Despite the NRI matching the second MSC (NRI from 'msc 1' in osmo-bsc.cfg) and round robin pointing at the
	 * third MSC ('roundrobin next 2'), the earlier Paging for the same TMSI causes this Paging Response to go to
	 * the first MSC (bssap_idx := 0). */
	f_perform_compl_l3(RSL, ts_PAG_RESP(valueof(ts_MI_TMSI_NRI_LV(nri_v))) );
	f_sleep(1.0);
}
testcase TC_mscpool_paging_and_response_tmsi() runs on test_CT {
	f_init(nr_bts := 1, handler_mode := true, nr_msc := 3);
	f_sleep(1.0);

	/* Testing a Paging on the first MSC to get a Paging Response back to the first MSC. Set round robin to the
	 * third MSC to make sure we're getting the Paging logic, not a coincidental round robin match. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 2");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.sccp_addr_bsc := g_bssap[pars1.mscpool.bssap_idx].sccp_addr_peer;
	pars1.sccp_addr_msc := g_bssap[pars1.mscpool.bssap_idx].sccp_addr_own;
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_paging_tmsi), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:paged");
	f_shutdown_helper();
}

/* For round-robin, skip an MSC that has 'no allow-attach' set. */
/* FIXME: each run is using a separate RSLem: RSL, RSL1, RSL2. It should work
 * just as well using only RSL. */
testcase TC_mscpool_no_allow_attach_round_robin() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 3);
	f_sleep(1.0);
	/* Mark the second MSC as offloading, round-robin should skip this MSC now. */
	f_vty_msc_allow_attach(BSCVTY, {true, false, true});

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars1.mscpool.rsl_idx := 0;
	pars1.mscpool.l3_info := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, valueof(ts_MI_IMSI_LV('001010000000001'H)), '00F110'O));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 2);
	pars2.mscpool.rsl_idx := 1;
	pars2.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, valueof(ts_MI_IMSI_LV('001010000000002'H))));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(2, "mscpool:subscr:new");

	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars3.mscpool.rsl_idx := 2;
	pars3.mscpool.l3_info := valueof(ts_PAG_RESP(valueof(ts_MI_IMSI_LV('001010000000003'H))));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");
	f_shutdown_helper();
}

/* An MSC that has 'no allow-attach' set should still serve subscribers that are already attached according to their
 * TMSI NRI. */
testcase TC_mscpool_no_allow_attach_valid_nri() runs on test_CT {

	f_init(nr_bts := 3, handler_mode := true, nr_msc := 3);
	f_sleep(1.0);

	/* Mark the second MSC as offloading, round-robin should skip this MSC now. */
	f_vty_msc_allow_attach(BSCVTY, {true, false, true});

	/* Control which MSC gets chosen next by the round-robin, otherwise
	 * would be randomly affected by which other tests ran before this. */
	f_vty_transceive(BSCVTY, "mscpool roundrobin next 0");

	f_ctrs_msc_init();

	/* Round robin points at msc 0, but the valid NRI directs to msc 1, even though msc 1 has 'no allow-attach'. */
	var MSC_ConnHdlr vc_conn1;
	var TestHdlrParams pars1 := f_gen_test_hdlr_pars(bssap_idx := 1);
	pars1.mscpool.rsl_idx := 0;
	/* An NRI of the second MSC's range (256-511) */
	pars1.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, valueof(ts_MI_TMSI_NRI_LV(260))));
	vc_conn1 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars1);
	vc_conn1.done;
	f_ctrs_msc_expect(1, "mscpool:subscr:known");

	var MSC_ConnHdlr vc_conn2;
	var TestHdlrParams pars2 := f_gen_test_hdlr_pars(bssap_idx := 0);
	pars2.mscpool.rsl_idx := 1;
	pars2.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, valueof(ts_MI_IMSI_LV('001010000000002'H))));
	vc_conn2 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars2);
	vc_conn2.done;
	f_ctrs_msc_expect(0, "mscpool:subscr:new");

	var MSC_ConnHdlr vc_conn3;
	var TestHdlrParams pars3 := f_gen_test_hdlr_pars(bssap_idx := 2);
	pars3.mscpool.rsl_idx := 2;
	pars3.mscpool.l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, valueof(ts_MI_IMSI_LV('001010000000003'H))));
	vc_conn3 := f_start_handler(refers(f_tc_mscpool_compl_l3), pars3);
	vc_conn3.done;
	f_ctrs_msc_expect(2, "mscpool:subscr:new");
	f_shutdown_helper();
}

/* Allow/Deny emergency calls globally via VTY */
private function f_vty_allow_emerg_msc(boolean allow) runs on test_CT {
	f_vty_enter_cfg_msc(BSCVTY, 0);
	if (allow) {
		f_vty_transceive(BSCVTY, "allow-emergency allow");
	} else {
		f_vty_transceive(BSCVTY, "allow-emergency deny");
	}
	f_vty_transceive(BSCVTY, "exit");
	f_vty_transceive(BSCVTY, "exit");
}

/* Allow/Deny emergency calls per BTS via VTY */
private function f_vty_allow_emerg_bts(boolean allow, integer bts_nr) runs on test_CT {
	f_vty_enter_cfg_bts(BSCVTY, bts_nr);
	if (allow) {
		f_vty_transceive(BSCVTY, "rach emergency call allowed 1");
	} else {
		f_vty_transceive(BSCVTY, "rach emergency call allowed 0");
	}
	f_vty_transceive(BSCVTY, "exit");
	f_vty_transceive(BSCVTY, "exit");
	f_vty_transceive(BSCVTY, "exit");
}

/* Begin assignmet procedure and send an EMERGENCY SETUP (RR) */
private function f_assignment_emerg_setup() runs on MSC_ConnHdlr {
	var PDU_ML3_MS_NW emerg_setup;
	var octetstring emerg_setup_enc;
	var RSL_Message emerg_setup_data_ind;

	f_establish_fully(omit, omit);

	emerg_setup := valueof(ts_ML3_MO_CC_EMERG_SETUP(1, valueof(ts_Bcap_voice)));
	emerg_setup_enc := enc_PDU_ML3_MS_NW(emerg_setup);
	emerg_setup_data_ind := valueof(ts_RSL_DATA_IND(g_chan_nr, valueof(ts_RslLinkID_DCCH(0)), emerg_setup_enc));

	RSL.send(emerg_setup_data_ind);
}

/* Test if the EMERGENCY SETUP gets passed on to the MSC via A when EMERGENCY
 * CALLS are permitted by the BSC config. */
private function f_TC_assignment_emerg_setup_allow(charstring id) runs on MSC_ConnHdlr {
	var PDU_BSSAP emerg_setup_data_ind_bssap;
	var PDU_ML3_MS_NW emerg_setup;
	timer T := 3.0;

	f_assignment_emerg_setup()

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_DTAP) -> value emerg_setup_data_ind_bssap {
		emerg_setup := dec_PDU_ML3_MS_NW(emerg_setup_data_ind_bssap.pdu.dtap);
		if (not isbound(emerg_setup.msgs.cc.emergencySetup)) {
			setverdict(fail, "no emergency setup");
		}
		}
	[] BSSAP.receive {
		setverdict(fail, "unexpected BSSAP message!");
		}
	[] T.timeout {
		setverdict(fail, "timout waiting for EMERGENCY SETUP!");
		}
	}

	setverdict(pass);
}

/* Test if the EMERGENCY SETUP gets blocked by the BSC if EMERGENCY CALLS are
 * forbidden by the BSC config. */
private function f_TC_assignment_emerg_setup_deny(charstring id) runs on MSC_ConnHdlr {
	var PDU_BSSAP emerg_setup_data_ind_bssap;
	timer T := 3.0;

	f_assignment_emerg_setup()

	T.start;
	alt {
	[] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_RELEASE)) {
		setverdict(pass);
		}
	[] RSL.receive {
		setverdict(fail, "unexpected RSL message!");
		}
	[] T.timeout {
		setverdict(fail, "timout waiting for RR CHANNEL RELEASE!");
		}
	}
}

/* EMERGENCY CALL situation #1, allowed globally and by BTS */
testcase TC_assignment_emerg_setup_allow() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_vty_allow_emerg_msc(true);
	f_vty_allow_emerg_bts(true, 0);
	vc_conn := f_start_handler(refers(f_TC_assignment_emerg_setup_allow), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* EMERGENCY CALL situation #2, forbidden globally but allowed by BTS */
testcase TC_assignment_emerg_setup_deny_msc() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	f_init(1, true);
	f_sleep(1.0);

	f_vty_allow_emerg_msc(false);
	f_vty_allow_emerg_bts(true, 0);
	vc_conn := f_start_handler(refers(f_TC_assignment_emerg_setup_deny), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* EMERGENCY CALL situation #3, allowed globally but forbidden by BTS */
testcase TC_assignment_emerg_setup_deny_bts() runs on test_CT {
	var TestHdlrParams pars := f_gen_test_hdlr_pars();
	var MSC_ConnHdlr vc_conn;

	/* Note: This simulates a spec violation by the MS, correct MS
	 * implementations would not try to establish an emergency call because
	 * the system information tells in advance that emergency calls are
	 * not forbidden */

	f_init(1, true);
	f_sleep(1.0);

	f_vty_allow_emerg_msc(true);
	f_vty_allow_emerg_bts(false, 0);
	vc_conn := f_start_handler(refers(f_TC_assignment_emerg_setup_deny), pars);
	vc_conn.done;
	f_shutdown_helper();
}

/* Test what happens when an emergency call arrives while all TCH channels are
 * busy, the BSC is expected to terminate one call in favor of the incoming
 * emergency call */
testcase TC_emerg_premption() runs on test_CT {
	var ASP_RSL_Unitdata rsl_ud;
	var integer i;
	var integer chreq_total, chreq_nochan;
	var RSL_Message rx_rsl;
	var RslChannelNr chan_nr;

	f_init(1);
	f_sleep(1.0);

	f_vty_allow_emerg_msc(true);
	f_vty_allow_emerg_bts(true, 0);

	/* Fill up all channels on the BTS */
	chreq_total := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total");
	chreq_nochan := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel");
	for (i := 0; i < NUM_TCHF_PER_BTS + NUM_TCHH_PER_BTS + NUM_SDCCH_PER_BTS; i := i+1) {
		chan_nr := f_chreq_act_ack('33'O, i);
	}
	IPA_RSL[0].clear;
	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total",
				   chreq_total + NUM_TCHF_PER_BTS + NUM_TCHH_PER_BTS + NUM_SDCCH_PER_BTS);

	/* Send Channel request for emegergency call */
	f_ipa_tx(0, ts_RSL_CHAN_RQD('A5'O, 23));

	/* Expect the BSC to release one (the first) TCH/F on the BTS */
	chan_nr := valueof(t_RslChanNr_Bm(1));
	f_expect_chan_rel(0, chan_nr, expect_rr_chan_rel := false, expect_rll_rel_req := false);

	/* Expect the BSC to send activate/assign the a channel for the emergency call */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	chan_nr := rx_rsl.ies[0].body.chan_nr;
	f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(chan_nr, 33));
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_IMM_ASSIGN(0));

	f_shutdown_helper();
}

/* Hopping parameters per a timeslot */
private type record length(0..64) of GsmArfcn ArfcnList;
private type record FHParamsTs {
	boolean		enabled,
	uint6_t		hsn,
	uint6_t		maio,
	ArfcnList	ma
};

/* Hopping parameters per a transceiver */
private type record FHParamsTrx {
	GsmArfcn	arfcn,
	FHParamsTs	ts[8]
};

/* Randomly generate the hopping parameters for the given timeslot numbers */
private function f_TC_fh_params_gen(template integer tr_tn := (1, 3, 5))
runs on test_CT return FHParamsTrx {
	var FHParamsTrx fhp;

	/* Generate a random ARFCN, including ARFCN 0 */
	fhp.arfcn := f_rnd_int(3);

	for (var integer tn := 0; tn < 8; tn := tn + 1) {
		if (not match(tn, tr_tn)) {
			fhp.ts[tn].enabled := false;
			fhp.ts[tn].ma := { };
			continue;
		}

		/* Random HSN / MAIO values: 0..63 */
		fhp.ts[tn].hsn := f_rnd_int(64);
		fhp.ts[tn].maio := f_rnd_int(64);
		fhp.ts[tn].ma := { };

		/* Random Mobile Allocation (hopping channels) */
		var integer ma_len := 2 + f_rnd_int(9); /* 2..10 channels */
		var integer step := 3 + f_rnd_int(4); /* 3..6 stepping */
		for (var integer i := 1; i <= ma_len; i := i + 1) {
			fhp.ts[tn].ma := fhp.ts[tn].ma & { i * step };
		}

		fhp.ts[tn].enabled := true;
	}

	log("f_TC_fh_params_gen(): ", fhp);
	return fhp;
}

/* Make sure that the given Channel Description IE matches the hopping configuration */
private function f_TC_fh_params_match_chan_desc(in FHParamsTrx fhp, in ChannelDescription cd)
{
	var template (present) ChannelDescription tr_cd;
	var template (present) MaioHsn tr_maio_hsn;
	var uint3_t tn := cd.chan_nr.tn;

	if (fhp.ts[tn].enabled) {
		tr_maio_hsn := tr_HsnMaio(fhp.ts[tn].hsn, fhp.ts[tn].maio);
		tr_cd := tr_ChanDescH1(cd.chan_nr, tr_maio_hsn);
	} else {
		tr_cd := tr_ChanDescH0(cd.chan_nr, fhp.arfcn);
	}

	if (not match(cd, tr_cd)) {
		setverdict(fail, "Channel Description IE does not match: ",
			   cd, " vs expected ", tr_cd);
	}
}

/* Make sure that the given Mobile Allocation IE matches the hopping configuration */
private function f_TC_fh_params_match_ma(in FHParamsTrx fhp, uint3_t tn,
					 in MobileAllocationLV ma)
{
	var template MobileAllocationLV tr_ma := f_TC_fh_params_gen_tr_ma(fhp, tn, ma);

	if (not match(ma, tr_ma)) {
		setverdict(fail, "Mobile Allocation IE does not match (tn := ",
			   tn, "): ", ma, " vs expected: ", tr_ma);
	} else {
		setverdict(pass);
	}
}

private function f_TC_fh_params_gen_tr_ma(in FHParamsTrx fhp, uint3_t tn,
					  in MobileAllocationLV ma)
return template MobileAllocationLV {
	/* Mobile Allocation IE is expected to be empty if hopping is not enabled */
	if (not fhp.ts[tn].enabled) {
		return { len := 0, ma := ''B };
	}

	var bitstring full_mask := f_pad_bit(''B, 1024, '0'B);
	var bitstring slot_mask := f_pad_bit(''B, 1024, '0'B);
	var bitstring ma_mask := ''B;

	/* Compose the full bit-mask (all channels, up to 1024 entries) */
	for (var integer i := 0; i < lengthof(fhp.ts); i := i + 1) {
		for (var integer j := 0; j < lengthof(fhp.ts[i].ma); j := j + 1) {
			if (full_mask[fhp.ts[i].ma[j]] == '1'B)
				{ continue; }
			full_mask[fhp.ts[i].ma[j]] := '1'B;
		}
	}

	/* Take ARFCN of the TRX itself into account */
	full_mask[fhp.arfcn] := '1'B;

	/* Compose a bit-mask for the given timeslot number */
	for (var integer i := 0; i < lengthof(fhp.ts[tn].ma); i := i + 1) {
		slot_mask[fhp.ts[tn].ma[i]] := '1'B;
	}

	/* Finally, compose the Mobile Allocation bit-mask */
	for (var integer i := 1; i < lengthof(full_mask); i := i + 1) {
		if (full_mask[i] != '1'B)
			{ continue; }

		/* FIXME: ma_mask := ma_mask & slot_mask[i]; // triggers a bug in TITAN */
		if (slot_mask[i] == '1'B) {
			ma_mask := ma_mask & '1'B;
		} else {
			ma_mask := ma_mask & '0'B;
		}
	}

	/* ARFCN 0 (if present) goes to the last position of the bit-mask */
	if (full_mask[0] == '1'B) {
		/* FIXME: ma_mask := ma_mask & slot_mask[0]; // triggers a bug in TITAN */
		if (slot_mask[0] == '1'B) {
			ma_mask := ma_mask & '1'B;
		} else {
			ma_mask := ma_mask & '0'B;
		}
	}

	/* Ensure that ma_mask is octet-aligned */
	var integer ma_mask_len := (lengthof(ma_mask) + 8 - 1) / 8;
	ma_mask := f_pad_bit(ma_mask, ma_mask_len * 8, '0'B);

	return { len := ma_mask_len, ma := ma_mask };
}

/* Configure the hopping parameters in accordance with the given record */
private function f_TC_fh_params_set(in FHParamsTrx fhp,
				    uint8_t bts_nr := 0,
				    uint8_t trx_nr := 0)
runs on test_CT {
	/* Enter the configuration node for the given BTS/TRX numbers */
	f_vty_enter_cfg_trx(BSCVTY, bts_nr, trx_nr);

	f_vty_transceive(BSCVTY, "arfcn " & int2str(fhp.arfcn));

	for (var integer tn := 0; tn < lengthof(fhp.ts); tn := tn + 1) {
		f_vty_transceive(BSCVTY, "timeslot " & int2str(tn));

		if (not fhp.ts[tn].enabled) {
			f_vty_transceive(BSCVTY, "hopping enabled 0");
			f_vty_transceive(BSCVTY, "exit"); /* go back */
			continue;
		}

		/* Configure HSN / MAIO values */
		f_vty_transceive(BSCVTY, "hopping sequence-number " & int2str(fhp.ts[tn].hsn));
		f_vty_transceive(BSCVTY, "hopping maio " & int2str(fhp.ts[tn].maio));

		/* Configure the Mobile Allocation (hopping channels) */
		for (var integer i := 0; i < lengthof(fhp.ts[tn].ma); i := i + 1) {
			f_vty_transceive(BSCVTY, "hopping arfcn add " & int2str(fhp.ts[tn].ma[i]));
		}

		f_vty_transceive(BSCVTY, "hopping enabled 1");
		f_vty_transceive(BSCVTY, "exit"); /* go back */
	}

	f_vty_transceive(BSCVTY, "end");
}

/* Disable frequency hopping on all timeslots */
private function f_TC_fh_params_unset(in FHParamsTrx fhp,
				      uint8_t bts_nr := 0,
				      uint8_t trx_nr := 0,
				      GsmArfcn arfcn := 871)
runs on test_CT {
	/* Enter the configuration node for the given BTS/TRX numbers */
	f_vty_enter_cfg_trx(BSCVTY, bts_nr, trx_nr);

	f_vty_transceive(BSCVTY, "arfcn " & int2str(arfcn));

	for (var integer tn := 0; tn < lengthof(fhp.ts); tn := tn + 1) {
		f_vty_transceive(BSCVTY, "timeslot " & int2str(tn));

		/* Delete all ARFCNs from the Mobile Allocation (if any) */
		for (var integer i := 0; i < lengthof(fhp.ts[tn].ma); i := i + 1) {
			f_vty_transceive(BSCVTY, "hopping arfcn del " & int2str(fhp.ts[tn].ma[i]));
		}

		f_vty_transceive(BSCVTY, "hopping enabled 0");
		f_vty_transceive(BSCVTY, "exit"); /* go back */
	}

	f_vty_transceive(BSCVTY, "end");
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");
}

/* Verify presence and correctness of the hopping parameters (HSN, MAIO)
 * in the Channel Identification IE of the RSL CHANnel ACTIVation message. */
testcase TC_fh_params_chan_activ() runs on test_CT {
	var FHParamsTrx fhp := f_TC_fh_params_gen();
	var RSL_Message rsl_msg;
	var RSL_IE_Body ie;

	f_init_vty();

	f_TC_fh_params_set(fhp); /* Enable frequency hopping */
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1);

	/* CS domain: 3 (SDCCH/4+CBCH) + 4 (TCH/F) + 2 (TCH/H) channels available */
	for (var integer i := 0; i < 9; i := i + 1) {
		f_ipa_tx(0, ts_RSL_CHAN_RQD(f_rnd_ra_cs(), 23));
		rsl_msg := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));

		/* Make sure that Channel Identification IE is present */
		if (not f_rsl_find_ie(rsl_msg, RSL_IE_CHAN_IDENT, ie)) {
			setverdict(fail, "RSL Channel Identification IE is absent");
			continue;
		}

		/* Make sure that hopping parameters (HSN/MAIO) match */
		f_TC_fh_params_match_chan_desc(fhp, ie.chan_ident.ch_desc.v);

		/* "Mobile Allocation shall be included but empty" - let's check this */
		if (ie.chan_ident.ma.v.len != 0) {
			setverdict(fail, "Mobile Allocation IE is not empty: ",
				   ie.chan_ident.ma, ", despite it shall be");
			continue;
		}
	}

	/* Disable frequency hopping */
	f_TC_fh_params_unset(fhp);

	f_shutdown_helper();
}

/* Verify the hopping parameters (HSN, MAIO, MA) in (RR) Immediate Assignment */
testcase TC_fh_params_imm_ass() runs on test_CT {
	var FHParamsTrx fhp := f_TC_fh_params_gen();
	var RSL_Message rsl_msg;
	var RSL_IE_Body ie;

	f_init_vty();

	f_TC_fh_params_set(fhp); /* Enable frequency hopping */
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1);

	/* CS domain: 3 (SDCCH/4+CBCH) + 4 (TCH/F) + 2 (TCH/H) channels available */
	for (var integer i := 0; i < 9; i := i + 1) {
		f_ipa_tx(0, ts_RSL_CHAN_RQD(f_rnd_ra_cs(), 23));
		rsl_msg := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));

		f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(rsl_msg.ies[0].body.chan_nr, 33));
		rsl_msg := f_exp_ipa_rx(0, tr_RSL_MsgTypeC(RSL_MT_IMMEDIATE_ASSIGN_CMD));

		/* Make sure that Full Immediate Assign Info IE is present */
		if (not f_rsl_find_ie(rsl_msg, RSL_IE_FULL_IMM_ASS_INFO, ie)) {
			setverdict(fail, "RSL Full Immediate Assign Info IE is absent");
			continue;
		}

		/* Decode the actual Immediate Assignment message */
		var GsmRrMessage rr_msg := dec_GsmRrMessage(ie.full_imm_ass_info.payload);
		if (not match(rr_msg.header, t_RrHeader(IMMEDIATE_ASSIGNMENT, ?))) {
			setverdict(fail, "Failed to match Immediate Assignment: ", rr_msg);
			continue;
		}

		/* Make sure that hopping parameters (HSN/MAIO) match */
		f_TC_fh_params_match_chan_desc(fhp, rr_msg.payload.imm_ass.chan_desc);

		/* Make sure that the Mobile Allocation IE matches */
		f_TC_fh_params_match_ma(fhp, rr_msg.payload.imm_ass.chan_desc.chan_nr.tn,
					rr_msg.payload.imm_ass.mobile_allocation);
	}

	/* Disable frequency hopping */
	f_TC_fh_params_unset(fhp);

	f_shutdown_helper();
}

/* Verify the hopping parameters (HSN, MAIO, MA) in (RR) Assignment Command */
testcase TC_fh_params_assignment_cmd() runs on test_CT {
	var FHParamsTrx fhp := f_TC_fh_params_gen();
	var RSL_Message rsl_msg;
	var RSL_IE_Body ie;

	f_init_vty();

	f_TC_fh_params_set(fhp); /* Enable frequency hopping */
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1);

	/* HACK: work around "Couldn't find Expect for CRCX" */
	vc_MGCP.stop;

	var template PDU_BSSAP ass_cmd := f_gen_ass_req();
	ass_cmd.pdu.bssmap.assignmentRequest.codecList := ts_BSSMAP_IE_CodecList({ts_CodecFR});

	/* CS domain (TCH): 4 (TCH/F) + 2 (TCH/H) channels available
	 * NOTE: only 3 SDCCH/4 channels are available on CCCH+SDCCH4+CBCH */
	for (var integer i := 0; i < 3; i := i + 1) {
		/* Establish a dedicated channel, so we can trigger (late) TCH assignment */
		var DchanTuple dt := f_est_dchan(f_rnd_ra_cs(), 23, f_rnd_octstring(16));

		/* Send a BSSMAP Assignment Command, expect CHANnel ACTIVation */
		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ass_cmd));
		rsl_msg := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));

		/* ACKnowledge CHANnel ACTIVation, expect RSL DATA REQuest */
		f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(rsl_msg.ies[0].body.chan_nr, 33));
		rsl_msg := f_exp_ipa_rx(0, tr_RSL_MsgTypeR(RSL_MT_DATA_REQ));

		/* Make sure that L3 Information IE is present */
		if (not f_rsl_find_ie(rsl_msg, RSL_IE_L3_INFO, ie)) {
			setverdict(fail, "RSL L3 Information IE is absent");
			continue;
		}

		/* Decode the L3 message and make sure it is (RR) Assignment Command */
		var GsmRrL3Message l3_msg := dec_GsmRrL3Message(ie.l3_info.payload);
		if (not match(l3_msg.header, t_RrL3Header(ASSIGNMENT_COMMAND))) {
			setverdict(fail, "Failed to match Assignment Command: ", l3_msg);
			continue;
		}

		/* Make sure that hopping parameters (HSN/MAIO) match */
		var ChannelDescription chan_desc := l3_msg.payload.ass_cmd.chan_desc;
		f_TC_fh_params_match_chan_desc(fhp, chan_desc);

		/* Make sure that Cell Channel Description IE is present if FH is enabled */
		if (chan_desc.h and not ispresent(l3_msg.payload.ass_cmd.cell_chan_desc)) {
			setverdict(fail, "FH enabled, but Cell Channel Description IE is absent");
			continue;
		}

		/* Make sure that the Mobile Allocation IE matches (if present) */
		var boolean ma_present := ispresent(l3_msg.payload.ass_cmd.mobile_allocation);
		if (chan_desc.h and ma_present) {
			f_TC_fh_params_match_ma(fhp, chan_desc.chan_nr.tn,
						l3_msg.payload.ass_cmd.mobile_allocation.v);
		} else if (chan_desc.h and not ma_present) {
			setverdict(fail, "FH enabled, but Mobile Allocation IE is absent");
			continue;
		} else if (not chan_desc.h and ma_present) {
			setverdict(fail, "FH disabled, but Mobile Allocation IE is present");
			continue;
		}
	}

	/* Give the IUT some time to release all channels */
	f_sleep(3.0);

	/* Disable frequency hopping */
	f_TC_fh_params_unset(fhp);

	f_shutdown_helper();
}

/* Verify the hopping parameters (HSN, MAIO, MA) in (RR) Handover Command */
private function f_TC_fh_params_handover_cmd(in FHParamsTrx fhp)
runs on test_CT {
	var RSL_Message rsl_msg;
	var RSL_IE_Body ie;
	var DchanTuple dt;

	/* Establish a dedicated channel, so we can trigger handover */
	dt := f_est_dchan(f_rnd_ra_cs(), 23, f_rnd_octstring(16));

	/* Trigger handover from BTS0 to BTS1 */
	f_bts_0_cfg(BSCVTY, { "neighbor bts 1" });
	f_vty_handover(BSCVTY, 0, 0, dt.rsl_chan_nr, 1);

	/* Expect RSL CHANnel ACTIVation on BTS1/TRX0/TS1 */
	rsl_msg := f_exp_ipa_rx(1, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));

	/* ACKnowledge channel activation and expect (RR) Handover Command */
	f_ipa_tx(1, ts_RSL_CHAN_ACT_ACK(rsl_msg.ies[0].body.chan_nr, 33));
	rsl_msg := f_exp_ipa_rx(0, tr_RSL_MsgTypeR(RSL_MT_DATA_REQ));

	/* Make sure that L3 Information IE is present */
	if (not f_rsl_find_ie(rsl_msg, RSL_IE_L3_INFO, ie)) {
		setverdict(fail, "RSL L3 Information IE is absent");
		return;
	}

	/* Decode the L3 message and make sure it is (RR) Handover Command */
	var GsmRrL3Message l3_msg := dec_GsmRrL3Message(ie.l3_info.payload);
	if (not match(l3_msg.header, t_RrL3Header(HANDOVER_COMMAND))) {
		setverdict(fail, "Failed to match Handover Command: ", l3_msg);
		return;
	}

	/* Make sure that we've got SDCCH/8 on TS1 (expected to be hopping) */
	var ChannelDescription chan_desc := l3_msg.payload.ho_cmd.chan_desc;
	if (not match(chan_desc.chan_nr, t_RslChanNr_SDCCH8(1, ?))) {
		setverdict(fail, "Unexpected channel number: ", chan_desc.chan_nr);
		return;
	}

	/* Make sure that hopping parameters (HSN/MAIO) match */
	f_TC_fh_params_match_chan_desc(fhp, chan_desc);

	/* Make sure that Cell Channel Description IE is present */
	if (not ispresent(l3_msg.payload.ho_cmd.cell_chan_desc)) {
		setverdict(fail, "FH enabled, but Cell Channel Description IE is absent");
		return;
	}

	/* Make sure that the Mobile Allocation (after time) IE is present and matches */
	var boolean ma_present := ispresent(l3_msg.payload.ho_cmd.mobile_allocation);
	if (ma_present) {
		f_TC_fh_params_match_ma(fhp, chan_desc.chan_nr.tn,
					l3_msg.payload.ho_cmd.mobile_allocation.v);
	} else {
		setverdict(fail, "FH enabled, but Mobile Allocation IE is absent");
		return;
	}
}
testcase TC_fh_params_handover_cmd() runs on test_CT {
	var FHParamsTrx fhp := f_TC_fh_params_gen();

	f_init_vty();

	/* (Re)configure TS0 as BCCH and TS1 as SDCCH8 on BTS1/TRX0 */
	f_vty_enter_cfg_trx(BSCVTY, bts := 1, trx := 0);

	f_vty_transceive(BSCVTY, "timeslot 0");
	f_vty_transceive(BSCVTY, "phys_chan_config ccch");
	f_vty_transceive(BSCVTY, "exit"); /* go back */

	f_vty_transceive(BSCVTY, "timeslot 1");
	f_vty_transceive(BSCVTY, "phys_chan_config sdcch8");
	f_vty_transceive(BSCVTY, "end"); /* we're done */

	f_TC_fh_params_set(fhp, 1); /* Enable frequency hopping on BTS1 */
	f_vty_transceive(BSCVTY, "drop bts connection 1 oml");

	f_init(2);

	f_TC_fh_params_handover_cmd(fhp);

	/* Disable frequency hopping on BTS1 */
	f_TC_fh_params_unset(fhp, 1);

	/* (Re)configure TS0 as CCCH+SDCCH4+CBCH and TS1 as TCH/F */
	f_vty_enter_cfg_trx(BSCVTY, bts := 1, trx := 0);

	f_vty_transceive(BSCVTY, "timeslot 0");
	f_vty_transceive(BSCVTY, "phys_chan_config ccch+sdcch4+cbch");
	f_vty_transceive(BSCVTY, "exit"); /* go back */

	f_vty_transceive(BSCVTY, "timeslot 1");
	f_vty_transceive(BSCVTY, "phys_chan_config tch/f");
	f_vty_transceive(BSCVTY, "end"); /* we're done */

	f_shutdown_helper();
}

/* Verify the hopping parameters in System Information Type 4 */
testcase TC_fh_params_si4_cbch() runs on test_CT {
	var FHParamsTrx fhp := f_TC_fh_params_gen(tr_tn := 1);
	var ASP_RSL_Unitdata rx_rsl_ud;
	timer T := 5.0;

	f_init_vty();

	/* (Re)configure TS0 as BCCH and TS1 as SDCCH8+CBCH */
	f_vty_enter_cfg_trx(BSCVTY, trx := 0);

	f_vty_transceive(BSCVTY, "timeslot 0");
	f_vty_transceive(BSCVTY, "phys_chan_config ccch");
	f_vty_transceive(BSCVTY, "exit"); /* go back */

	f_vty_transceive(BSCVTY, "timeslot 1");
	f_vty_transceive(BSCVTY, "phys_chan_config sdcch8+cbch");
	f_vty_transceive(BSCVTY, "end"); /* we're done */

	f_TC_fh_params_set(fhp); /* Enable frequency hopping */
	f_vty_transceive(BSCVTY, "drop bts connection 0 oml");

	f_init(1);

	T.start;
	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(tr_RSL_BCCH_INFO(RSL_SYSTEM_INFO_4))) -> value rx_rsl_ud {
		var RSL_IE_Body ie := rx_rsl_ud.rsl.ies[2].body; /* FULL BCCH Information IE */
		var SystemInformation si := dec_SystemInformation(ie.other.payload);

		/* Make sure that what we decoded is System Information Type 4 */
		if (si.header.message_type != SYSTEM_INFORMATION_TYPE_4) {
			setverdict(fail, "RSL FULL BCCH Information IE contains: ", si);
			repeat;
		}

		/* Make sure that CBCH Channel Description IE is present */
		if (not ispresent(si.payload.si4.cbch_chan_desc)) {
			setverdict(fail, "CBCH Channel Description IE is absent");
			break;
		}

		/* Finally, check the hopping parameters (HSN, MAIO) */
		var ChannelDescription chan_desc := si.payload.si4.cbch_chan_desc.v;
		f_TC_fh_params_match_chan_desc(fhp, chan_desc);

		/* 3GPP TS 44.018, section 9.1.36.2 "CBCH Mobile Allocation":
		 * The CBCH Mobile Allocation IE *shall* be present if FH is enabled. */
		if (chan_desc.h and not ispresent(si.payload.si4.cbch_mobile_alloc)) {
			setverdict(fail, "FH enabled, but Mobile Allocation IE is absent");
			break;
		} else if (chan_desc.h and ispresent(si.payload.si4.cbch_mobile_alloc)) {
			f_TC_fh_params_match_ma(fhp, chan_desc.chan_nr.tn,
						si.payload.si4.cbch_mobile_alloc.v);
		}
		}
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout waiting for RSL BCCH INFOrmation (SI4)");
		}
	}

	/* Disable frequency hopping */
	f_TC_fh_params_unset(fhp);

	/* (Re)configure TS0 as CCCH+SDCCH4+CBCH and TS1 as TCH/F */
	f_vty_enter_cfg_trx(BSCVTY, trx := 0);

	f_vty_transceive(BSCVTY, "timeslot 0");
	f_vty_transceive(BSCVTY, "phys_chan_config ccch+sdcch4+cbch");
	f_vty_transceive(BSCVTY, "exit"); /* go back */

	f_vty_transceive(BSCVTY, "timeslot 1");
	f_vty_transceive(BSCVTY, "phys_chan_config tch/f");
	f_vty_transceive(BSCVTY, "end"); /* we're done */

	f_shutdown_helper();
}

template (value) PDU_BSSAP_LE ts_BSSMAP_LE_BSSLAP(template (value) BSSLAP_PDU bsslap)
	:= ts_BSSMAP_LE_ConnInfo(BSSMAP_LE_PROT_BSSLAP, data := enc_BSSLAP_PDU(valueof(bsslap)));

private function f_match_bsslap(PDU_BSSAP_LE got_bsslap_msg,
				template (present) BSSLAP_PDU expect_bsslap)
{
	var BSSLAP_PDU bsslap := dec_BSSLAP_PDU(got_bsslap_msg.pdu.bssmap.co_info.bsslap_apdu.data);
	if (not match(bsslap, expect_bsslap)) {
		log("EXPECTING BSSLAP: ", expect_bsslap);
		log("GOT BSSLAP: ", bsslap);
		setverdict(fail, "BSSLAP is not as expected");
		mtc.stop;
	}
	setverdict(pass);
}

/* GAD: this is an Ellipsoid point with uncertainty circle, encoded as in 3GPP TS 23.032 §7.3.2. */
const octetstring gad_ell_point_unc_circle := '10b0646d0d5f6627'O;

private function f_expect_bsslap(template (present) BSSLAP_PDU expect_rx_bsslap) runs on MSC_ConnHdlr {
	var PDU_BSSAP_LE rx_bsslap;
	BSSAP_LE.receive(tr_BSSMAP_LE_ConnInfo(BSSMAP_LE_PROT_BSSLAP, ?)) -> value(rx_bsslap);
	f_match_bsslap(rx_bsslap, expect_rx_bsslap);
}

/* With an active lchan, start BSSMAP Perform Location Request on A interface, starting BSSMAP-LE Perform Location
 * Request on Lb interface. Either with or without the SMLC doing a BSSLAP TA Request. */
private function f_lcs_loc_req_for_active_ms(boolean do_ta_request := false) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_establish_fully(omit, omit);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	BSSAP.send(valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
					ts_CellId_CGI('262'H, '42'H, 23, 42))));

	var PDU_BSSAP_LE plr;
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?)) -> value(plr);

	if (not do_ta_request) {
		/* verify TA Layer 3 in APDU. First the APDU type (BSSLAP), then the BSSLAP data contents. */
		var template BSSMAP_LE_IE_APDU expect_apdu := tr_BSSMAP_LE_APDU(BSSMAP_LE_PROT_BSSLAP, ?);
		if (not match(plr.pdu.bssmap.perf_loc_req.bsslap_apdu, expect_apdu)) {
			log("EXPECTING BSSMAP-LE APDU IE ", expect_apdu);
			log("GOT BSSMAP-LE APDU IE ", plr.pdu.bssmap.perf_loc_req.bsslap_apdu);
			setverdict(fail, "BSSMAP-LE APDU IE is not as expected");
			mtc.stop;
		}
		var template BSSLAP_PDU expect_ta_layer3 := tr_BSSLAP_TA_Layer3(tr_BSSLAP_IE_TA(0));
		var BSSLAP_PDU bsslap := dec_BSSLAP_PDU(plr.pdu.bssmap.perf_loc_req.bsslap_apdu.data);
		if (not match(bsslap, expect_ta_layer3)) {
			log("EXPECTING BSSLAP TA Layer 3: ", expect_ta_layer3);
			log("GOT BSSLAP: ", bsslap);
			setverdict(fail, "BSSLAP is not as expected");
			mtc.stop;
		}
		/* OsmoBSC directly sent the TA as BSSLAP APDU in the BSSMAP-LE Perform Location Request to the SMLC. The SMLC
		 * has no need to request the TA from the BSC and directly responds. */
	} else {
		/* SMLC wants to ask the TA from the BSC explicitly in a BSSLAP TA Request message */
		BSSAP_LE.send(ts_BSSMAP_LE_BSSLAP(ts_BSSLAP_TA_Req));
		f_expect_bsslap(tr_BSSLAP_TA_Resp(?, ?));
	}

	/* SMLC got the TA from the BSC, now responds with geo information data. */
	BSSAP_LE.send(ts_BSSMAP_LE_PerfLocResp(gad_ell_point_unc_circle, omit));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);
	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(tr_BSSMAP_IE_LocationEstimate(gad_ell_point_unc_circle)));

	/* The LCS was using an active A-interface conn. It should still remain active after this. */
	f_mo_l3_transceive();

	f_perform_clear(RSL);

	f_sleep(2.0);
	setverdict(pass);
}

/* With an active lchan, start BSSMAP Perform Location Request on A interface, starting BSSMAP-LE Perform Location
 * Request on Lb interface.  Without the SMLC doing a BSSLAP TA Request. */
private function f_tc_lcs_loc_req_for_active_ms(charstring id) runs on MSC_ConnHdlr {
	f_lcs_loc_req_for_active_ms(false);
}
testcase TC_lcs_loc_req_for_active_ms() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_for_active_ms), pars);
	vc_conn.done;
}

/* With an active lchan, start BSSMAP Perform Location Request on A interface, starting BSSMAP-LE Perform Location
 * Request on Lb interface.  With the SMLC doing a BSSLAP TA Request. */
private function f_tc_lcs_loc_req_for_active_ms_ta_req(charstring id) runs on MSC_ConnHdlr {
	f_lcs_loc_req_for_active_ms(true);
}
testcase TC_lcs_loc_req_for_active_ms_ta_req() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_for_active_ms_ta_req), pars);
	vc_conn.done;
}

/* Clear the A-interface conn only, without doing anything on Abis. Useful for LCS, for cases where there is only an A
 * conn without an active lchan. */
private function f_clear_A_conn() runs on MSC_ConnHdlr
{
	var BssmapCause cause := 0;
	BSSAP.send(ts_BSSMAP_ClearCommand(cause));
	BSSAP.receive(tr_BSSMAP_ClearComplete);
	BSSAP.send(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_REQ);

	timer no_more_bssap := 5.0;
	no_more_bssap.start;
	alt {
	[] no_more_bssap.timeout { break; }
	[] BSSAP.receive(tr_BSSAP_BSSMAP) {
		setverdict(fail, "Expected no more BSSAP after Clear Complete");
		mtc.stop;
	}
	}
	setverdict(pass);
}

/* Verify that the A-interface connection is still working, and then clear it, without doing anything on Abis.  Useful
 * for LCS, for cases where there is only an A conn without an active lchan. */
private function f_verify_active_A_conn_and_clear() runs on MSC_ConnHdlr
{
	f_logp(BSCVTY, "f_verify_active_A_conn_and_clear: test A link, then clear");

	/* When an lchan is active, we can send some L3 data from the BTS side and verify that it shows up on the other
	 * side towards the MSC. When there is no lchan, this is not possible. To probe whether the A-interface
	 * connection is still up, we need something that echos back on the A-interface. Another LCS request! */
	BSSAP.send(valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
					ts_CellId_CGI('262'H, '42'H, 23, 42))));
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?));

	/* Right, the Perform Location Request showed up on Lb, now we can clear the A conn. */
	f_clear_A_conn();
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocAbort(BSSMAP_LE_LCS_CAUSE_REQUEST_ABORTED));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);
}

/* With *no* active lchan, start BSSMAP Perform Location Request on A interface, starting BSSMAP-LE Perform Location
 * Request on Lb interface. BSC will Page for the subscriber as soon as we (virtual SMLC) request the TA via BSSLAP.
 */
private function f_tc_lcs_loc_req_for_idle_ms(charstring id) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	/* Register to receive the Paging Command */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	g_chan_nr := new_chan_nr;
	f_rslem_register(0, g_chan_nr);

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
										ts_CellId_CGI('001'H, '01'H, 1, 0)))));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	var PDU_BSSAP_LE plr;
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?)) -> value(plr);

	/* SMLC wants to ask the TA from the BSC explicitly in a BSSLAP TA Request message */
	BSSAP_LE.send(ts_BSSMAP_LE_BSSLAP(ts_BSSLAP_TA_Req));

	/* OsmoBSC needs to Page */
	RSL.receive(tr_RSL_PAGING_CMD(tr_MI_IMSI(g_pars.imsi)));
	f_logp(BSCVTY, "got Paging Command");

	/* MS requests channel. Since the Paging was for LCS, the Paging Response does not trigger a Complete Layer 3 to
	 * the MSC, and releases the lchan directly. */
	f_perform_compl_l3(RSL, ts_PAG_RESP(valueof(ts_MI_IMSI_LV(g_pars.imsi))), do_clear := false, expect_bssmap_l3 := false);
	f_expect_lchan_rel(RSL);

	/* From the Paging Response, the TA is now known to the BSC, and it responds to the SMLC. */

	f_expect_bsslap(tr_BSSLAP_TA_Resp(?, ?));

	/* SMLC got the TA from the BSC, now responds with geo information data. */
	BSSAP_LE.send(ts_BSSMAP_LE_PerfLocResp(gad_ell_point_unc_circle, omit));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);

	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(tr_BSSMAP_IE_LocationEstimate(gad_ell_point_unc_circle)));

	/* The lchan is gone, the A-interface conn was created for the LCS only.
	 * Still it is clearly the MSC's job to decide whether to tear down the conn or not. */
	f_verify_active_A_conn_and_clear();

	f_sleep(2.0);
	setverdict(pass);
}
testcase TC_lcs_loc_req_for_idle_ms() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_for_idle_ms), pars);
	vc_conn.done;
}

/* With no active lchan, start BSSMAP Perform Location Request on A interface, but omit IMSI; expect failure response.
 */
private function f_tc_lcs_loc_req_no_subscriber(charstring id) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	/* provoke an abort by omitting both IMSI and IMEI */
	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				valueof(ts_BSSMAP_Perform_Location_Request(omit,
					ts_CellId_CGI('262'H, '42'H, 23, 42)))));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	/* BSC tells MSC about failure */
	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(
			locationEstimate := omit, positioningData := omit,
			lCS_Cause := tr_BSSMAP_LcsCause(BSSMAP_LCS_CAUSE_DATA_MISSING_IN_REQ)));

	/* There is no lchan. Still the MSC's job to decide whether to tear down the conn or not. */
	f_verify_active_A_conn_and_clear();

	f_sleep(2.0);
	setverdict(pass);
}
testcase TC_lcs_loc_req_no_subscriber() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_no_subscriber), pars);
	vc_conn.done;
}

/* With an active lchan, start a Perform Location Request on the A-interface, but virtual SMLC does not answer with
 * BSSMAP-LE Perform Location Response (before or after sending a BSSLAP TA Request) */
private function f_lcs_loc_req_for_active_ms_le_timeout(boolean do_ta) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_establish_fully(omit, omit);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	BSSAP.send(valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
					ts_CellId_CGI('262'H, '42'H, 23, 42))));

	var PDU_BSSAP_LE plr;
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?)) -> value(plr);

	if (do_ta) {
		/* SMLC wants to ask the TA from the BSC explicitly in a BSSLAP TA Request message */
		BSSAP_LE.send(ts_BSSMAP_LE_BSSLAP(ts_BSSLAP_TA_Req));
		f_expect_bsslap(tr_BSSLAP_TA_Resp(?, ?));
	}

	/* SMLC fails to respond, BSC runs into timeout */
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocAbort(BSSMAP_LE_LCS_CAUSE_SYSTEM_FAILURE));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);

	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(
			locationEstimate := omit, positioningData := omit,
			lCS_Cause := tr_BSSMAP_LcsCause(BSSMAP_LCS_CAUSE_SYSTEM_FAILURE)));

	/* There is no lchan. Still the MSC's job to decide whether to tear down the conn or not. */
	f_verify_active_A_conn_and_clear();

	f_sleep(2.0);
	setverdict(pass);
}

/* With an active lchan, start a Perform Location Request on the A-interface, but virtual SMLC does not answer with
 * BSSMAP-LE Perform Location Response, without sending a BSSLAP TA Request. */
private function f_tc_lcs_loc_req_for_active_ms_le_timeout(charstring id) runs on MSC_ConnHdlr {
	f_lcs_loc_req_for_active_ms_le_timeout(false);
}

testcase TC_lcs_loc_req_for_active_ms_le_timeout() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_for_active_ms_le_timeout), pars);
	vc_conn.done;
}

/* With an active lchan, start a Perform Location Request on the A-interface, but virtual SMLC does not answer with
 * BSSMAP-LE Perform Location Response, after sending a BSSLAP TA Request. */
private function f_tc_lcs_loc_req_for_active_ms_le_timeout2(charstring id) runs on MSC_ConnHdlr {
	f_lcs_loc_req_for_active_ms_le_timeout(true);
}

testcase TC_lcs_loc_req_for_active_ms_le_timeout2() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_for_active_ms_le_timeout2), pars);
	vc_conn.done;
}

/* With *no* active lchan, start a Perform Location Request, expecting that the MS will be Paged. */
private function f_tc_lcs_loc_req_for_idle_ms_no_pag_resp(charstring id) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	/* Register to receive the Paging Command */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	g_chan_nr := new_chan_nr;
	f_rslem_register(0, g_chan_nr);

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
										ts_CellId_CGI('001'H, '01'H, 1, 0)))));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	var PDU_BSSAP_LE plr;
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?)) -> value(plr);

	/* SMLC wants to ask the TA from the BSC explicitly in a BSSLAP TA Request message */
	BSSAP_LE.send(ts_BSSMAP_LE_BSSLAP(ts_BSSLAP_TA_Req));

	/* OsmoBSC needs to Page */
	var PDU_BSSAP_LE rx_bsslap;
	alt {
	[] RSL.receive(tr_RSL_PAGING_CMD(tr_MI_IMSI(g_pars.imsi))) {
		f_logp(BSCVTY, "got Paging Command");
		repeat;
	}
	[] BSSAP_LE.receive(tr_BSSMAP_LE_ConnInfo(BSSMAP_LE_PROT_BSSLAP, ?)) -> value(rx_bsslap) {
		/* MS does not respond to Paging, TA Req runs into timeout. */
		f_match_bsslap(rx_bsslap, tr_BSSLAP_Abort(?));
	}
	}

	/* SMLC responds with failure */
	BSSAP_LE.send(ts_BSSMAP_LE_PerfLocResp(omit, BSSMAP_LE_LCS_CAUSE_REQUEST_ABORTED));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);

	/* BSC tells MSC about failure */
	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(
			locationEstimate := omit, positioningData := omit,
			lCS_Cause := tr_BSSMAP_LcsCause(BSSMAP_LCS_CAUSE_REQUEST_ABORTED)));

	/* There is no lchan. Still the MSC's job to decide whether to tear down the conn or not. */
	f_verify_active_A_conn_and_clear();

	f_sleep(2.0);
	setverdict(pass);
}
testcase TC_lcs_loc_req_for_idle_ms_no_pag_resp() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_lcs_loc_req_for_idle_ms_no_pag_resp), pars);
	vc_conn.done;
}

/* During an ongoing Location Request, the MS sends a CM Service Request. Expect the same A-conn to be re-used / taken
 * over. */
private function f_tc_cm_service_during_lcs_loc_req(charstring id) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3", FR_AMR);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	/* Register to receive the Paging Command */
	var RslChannelNr new_chan_nr := valueof(t_RslChanNr0(1, RSL_CHAN_NR_Bm_ACCH));
	g_chan_nr := new_chan_nr;
	f_rslem_register(0, g_chan_nr);

	BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_bsc, g_pars.sccp_addr_msc,
				     valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
										ts_CellId_CGI('001'H, '01'H, 1, 0)))));
	BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND);

	var PDU_BSSAP_LE plr;
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?)) -> value(plr);

	/* As the A-interface conn was established for LCS, the MS coincidentally decides to issue a CM Service Request
	 * and establish Layer 3. It should use the existing A-interface conn. */
	f_perform_compl_l3(RSL, valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, valueof(ts_MI_IMSI_LV(g_pars.imsi)))),
			do_clear := false, expect_bssmap_l3 := true);

	/* SMLC wants to ask the TA from the BSC explicitly in a BSSLAP TA Request message */
	BSSAP_LE.send(ts_BSSMAP_LE_BSSLAP(ts_BSSLAP_TA_Req));

	/* OsmoBSC already has an lchan, no need to Page, just returns the TA */
	f_expect_bsslap(tr_BSSLAP_TA_Resp(?, ?));

	/* SMLC got the TA from the BSC, now responds with geo information data. */
	BSSAP_LE.send(ts_BSSMAP_LE_PerfLocResp(gad_ell_point_unc_circle, omit));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);
	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(tr_BSSMAP_IE_LocationEstimate(gad_ell_point_unc_circle)));

	/* The lchan should still exist, it was from a CM Service Request. */
	f_mo_l3_transceive();

	f_perform_clear(RSL);

	f_sleep(2.0);
	setverdict(pass);
}
testcase TC_cm_service_during_lcs_loc_req() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(1, true);
	f_sleep(1.0);

	pars.sccp_addr_msc := g_bssap[0].sccp_addr_own;
	pars.sccp_addr_bsc := g_bssap[0].sccp_addr_peer;

	vc_conn := f_start_handler(refers(f_tc_cm_service_during_lcs_loc_req), pars);
	vc_conn.done;
}

/* During an ongoing Perform Location Request, do a Handover, an expect a BSSLAP Reset message from the BSC to indicate
 * the new lchan after handover. */
private function f_tc_ho_during_lcs_loc_req(charstring id) runs on MSC_ConnHdlr {
	f_sleep(1.0);

	f_establish_fully(omit, omit);
	f_bssap_le_register_imsi(g_pars.imsi, omit);

	BSSAP.send(valueof(ts_BSSMAP_Perform_Location_Request(ts_BSSMAP_Imsi(g_pars.imsi),
					ts_CellId_CGI('262'H, '42'H, 23, 42))));

	var PDU_BSSAP_LE plr;
	BSSAP_LE.receive(tr_BSSMAP_LE_PerfLocReq(BSSMAP_LE_LOC_INFO_CURRENT_GEOGRAPHIC_LOC, ?, ?)) -> value(plr);

	/* SMLC ponders the Location Request, in the meantime the BSC decides to handover */
	f_bts_0_cfg(BSCVTY, {"neighbor bts 1"});

	var HandoverState hs := {
		rr_ho_cmpl_seen := false,
		handover_done := false,
		old_chan_nr := -
	};
	/* issue hand-over command on VTY */
	f_vty_handover(BSCVTY, 0, 0, g_chan_nr, 1);
	/* temporarily suspend DChan processing on BTS1 to avoid race with RSLEM_register */
	f_rslem_suspend(RSL1_PROC);

	/* From the MGW perspective, a handover is is characterized by
	 * performing one MDCX operation with the MGW. So we expect to see
	 * one more MDCX during handover. */
	g_media.mgcp_conn[0].mdcx_seen_exp := g_media.mgcp_conn[0].crcx_seen_exp + 1;

	alt {
	[] as_handover(hs);
	}

	var PDU_BSSAP_LE rx_bsslap;

	interleave {
	/* Expect the BSC to inform the MSC about the handover */
	[] BSSAP.receive(tr_BSSMAP_HandoverPerformed);

	/* Expect the BSC to inform the SMLC about the handover */
	[] BSSAP_LE.receive(tr_BSSMAP_LE_ConnInfo(BSSMAP_LE_PROT_BSSLAP, ?)) -> value(rx_bsslap) {
		f_match_bsslap(rx_bsslap, tr_BSSLAP_Reset(BSSLAP_CAUSE_INTRA_BSS_HO));
	}
	}

	/* SMLC now responds with geo information data. */
	BSSAP_LE.send(ts_BSSMAP_LE_PerfLocResp(gad_ell_point_unc_circle, omit));
	BSSAP_LE.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_IND);
	BSSAP.receive(tr_BSSMAP_Perform_Location_Response(tr_BSSMAP_IE_LocationEstimate(gad_ell_point_unc_circle)));

	/* lchan still active */
	f_mo_l3_transceive(RSL1);

	/* MSC decides it is done now. */
	f_perform_clear(RSL1);

	f_sleep(2.0);
	setverdict(pass);
}
testcase TC_ho_during_lcs_loc_req() runs on test_CT {
	var MSC_ConnHdlr vc_conn;
	var TestHdlrParams pars := f_gen_test_hdlr_pars();

	f_init(2, true);
	f_sleep(1.0);
	vc_conn := f_start_handler(refers(f_tc_ho_during_lcs_loc_req), pars);
	vc_conn.done;
}

/* Dyn PDCH todo:
   * activate OSMO as TCH/F
   * activate OSMO as TCH/H
   * does the BSC-located PCU socket get the updated INFO?
   * what if no PCU is connected at the time?
   * is the info correct on delayed PCU (re)connect?
 */

control {
	/* CTRL interface testing */
	execute( TC_ctrl_msc_connection_status() );
	execute( TC_ctrl_msc0_connection_status() );
	execute( TC_ctrl() );
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_SCCPlite_SERVER) {
		execute( TC_ctrl_location() );
	}

	execute( TC_si_default() );
	execute( TC_si2quater_2_earfcns() );
	execute( TC_si2quater_3_earfcns() );
	execute( TC_si2quater_4_earfcns() );
	execute( TC_si2quater_5_earfcns() );
	execute( TC_si2quater_6_earfcns() );
	execute( TC_si2quater_12_earfcns() );
	execute( TC_si2quater_23_earfcns() );
	execute( TC_si2quater_32_earfcns() );
	execute( TC_si2quater_33_earfcns() );
	execute( TC_si2quater_42_earfcns() );
	execute( TC_si2quater_48_earfcns() );
	execute( TC_si2quater_49_earfcns() );
	execute( TC_si_acc_rotate() );
	execute( TC_si_acc_ramp_rotate() );

	/* RSL DCHAN Channel ACtivation / Deactivation */
	execute( TC_chan_act_noreply() );
	execute( TC_chan_act_counter() );
	execute( TC_chan_act_ack_noest() );
	execute( TC_chan_act_ack_noest_emerg() );
	execute( TC_chan_rqd_emerg_deny() );
	execute( TC_chan_act_ack_est_ind_noreply() );
	execute( TC_chan_act_ack_est_ind_refused() );
	execute( TC_chan_act_nack() );
	execute( TC_chan_exhaustion() );
	execute( TC_chan_deact_silence() );
	execute( TC_chan_rel_rll_rel_ind() );
	execute( TC_chan_rel_conn_fail() );
	execute( TC_chan_rel_hard_clear() );
	execute( TC_chan_rel_hard_clear_csfb() );
	execute( TC_chan_rel_hard_rlsd() );
	execute( TC_chan_rel_hard_rlsd_ms_dead() );
	execute( TC_chan_rel_a_reset() );
	execute( TC_chan_rel_sccp_tiar_timeout() );
	execute( TC_chan_rel_rr_cause() );

	execute( TC_outbound_connect() );

	/* Assignment related */
	execute( TC_assignment_cic_only() );
	execute( TC_assignment_csd() );
	execute( TC_assignment_ctm() );
	execute( TC_assignment_sign() );
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		execute( TC_assignment_aoip_tla_v6() );
	}
	execute( TC_assignment_fr_a5_0() );
	execute( TC_assignment_fr_a5_1() );
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		execute( TC_assignment_fr_a5_1_codec_missing() );
	}
	execute( TC_assignment_fr_a5_3() );
	execute( TC_assignment_fr_a5_4() );
	execute( TC_ciph_mode_a5_0() );
	execute( TC_ciph_mode_a5_1() );
	execute( TC_ciph_mode_a5_3() );

	execute( TC_assignment_codec_fr() );
	execute( TC_assignment_codec_hr() );
	execute( TC_assignment_codec_efr() );
	execute( TC_assignment_codec_amr_f() );
	execute( TC_assignment_codec_amr_h() );

	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		execute( TC_assignment_codec_amr_f_S1() );
		execute( TC_assignment_codec_amr_h_S1() );
		execute( TC_assignment_codec_amr_f_S124() );
		execute( TC_assignment_codec_amr_h_S124() );
		execute( TC_assignment_codec_amr_f_S0() );
		execute( TC_assignment_codec_amr_f_S02() );
		execute( TC_assignment_codec_amr_f_S024() );
		execute( TC_assignment_codec_amr_f_S0247() );
		execute( TC_assignment_codec_amr_h_S0() );
		execute( TC_assignment_codec_amr_h_S02() );
		execute( TC_assignment_codec_amr_h_S024() );
		execute( TC_assignment_codec_amr_h_S0247() );
		execute( TC_assignment_codec_amr_f_S01234567() );
		execute( TC_assignment_codec_amr_f_S0234567() );
		execute( TC_assignment_codec_amr_f_zero() );
		execute( TC_assignment_codec_amr_f_unsupp() );
		execute( TC_assignment_codec_amr_h_S7() );
	}

	execute( TC_assignment_codec_fr_exhausted_req_hr() );
	execute( TC_assignment_codec_fr_exhausted_req_fr() );
	execute( TC_assignment_codec_fr_exhausted_req_fr_hr() );
	execute( TC_assignment_codec_fr_exhausted_req_hr_fr() );
	execute( TC_assignment_codec_hr_exhausted_req_fr() );
	execute( TC_assignment_codec_hr_exhausted_req_hr() );
	execute( TC_assignment_codec_hr_exhausted_req_hr_fr() );
	execute( TC_assignment_codec_hr_exhausted_req_fr_hr() );
	execute( TC_assignment_codec_req_hr_fr() );
	execute( TC_assignment_codec_req_fr_hr() );

	if (mp_enable_osmux_test) {
		execute( TC_assignment_osmux() );
	}

	/* RLL Establish Indication on inactive DCHAN / SAPI */
	execute( TC_rll_est_ind_inact_lchan() );
	execute( TC_rll_est_ind_inval_sapi1() );
	execute( TC_rll_est_ind_inval_sapi3() );
	execute( TC_rll_est_ind_inval_sacch() );

	/* DLCI / RSL Link ID conversion for MO/MT messages on SAPI0/SAPI3 */
	execute( TC_tch_dlci_link_id_sapi() );

	/* SAPI N Reject triggered by RLL establishment failures */
	execute( TC_rll_rel_ind_sapi_n_reject() );
	execute( TC_rll_err_ind_sapi_n_reject() );
	execute( TC_rll_timeout_sapi_n_reject() );

	/* Paging related tests */
	execute( TC_paging_imsi_nochan() );
	execute( TC_paging_tmsi_nochan() );
	execute( TC_paging_tmsi_any() );
	execute( TC_paging_tmsi_sdcch() );
	execute( TC_paging_tmsi_tch_f() );
	execute( TC_paging_tmsi_tch_hf() );
	execute( TC_paging_imsi_nochan_cgi() );
	execute( TC_paging_imsi_nochan_lac_ci() );
	execute( TC_paging_imsi_nochan_ci() );
	execute( TC_paging_imsi_nochan_lai() );
	execute( TC_paging_imsi_nochan_lac() );
	execute( TC_paging_imsi_nochan_all() );
	execute( TC_paging_imsi_nochan_plmn_lac_rnc() );
	execute( TC_paging_imsi_nochan_rnc() );
	execute( TC_paging_imsi_nochan_lac_rnc() );
	execute( TC_paging_imsi_nochan_lacs() );
	execute( TC_paging_imsi_nochan_lacs_empty() );
	execute( TC_paging_imsi_nochan_cgi_unknown_cid() );
	execute( TC_paging_imsi_a_reset() );
	execute( TC_paging_imsi_load() );
	execute( TC_paging_counter() );
	execute( TC_paging_resp_unsol() );

	execute( TC_rsl_drop_counter() );
	execute( TC_rsl_unknown_unit_id() );

	execute( TC_oml_unknown_unit_id() );

	execute( TC_classmark() );
	execute( TC_common_id() );
	execute( TC_unsol_ass_fail() );
	execute( TC_unsol_ass_compl() );
	execute( TC_unsol_ho_fail() );
	execute( TC_err_82_short_msg() );
	execute( TC_err_84_unknown_msg() );

	execute( TC_ho_int() );

	execute( TC_ho_out_of_this_bsc() );
	execute( TC_ho_out_fail_no_msc_response() );
	execute( TC_ho_out_fail_rr_ho_failure() );
	execute( TC_ho_out_fail_no_result_after_ho_cmd() );

	execute( TC_ho_into_this_bsc() );
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		execute( TC_ho_into_this_bsc_tla_v6() );
	}
	execute( TC_ho_in_fail_msc_clears() );
	execute( TC_ho_in_fail_msc_clears_after_ho_detect() );
	execute( TC_ho_in_fail_no_detect() );
	execute( TC_ho_in_fail_no_detect2() );

	execute( TC_ho_neighbor_config_1() );
	execute( TC_ho_neighbor_config_2() );
	execute( TC_ho_neighbor_config_3() );
	execute( TC_ho_neighbor_config_4() );
	execute( TC_ho_neighbor_config_5() );
	execute( TC_ho_neighbor_config_6() );
	execute( TC_ho_neighbor_config_7() );

	execute( TC_bssap_rlsd_does_not_cause_bssmap_reset() );
	execute( TC_bssmap_clear_does_not_cause_bssmap_reset() );
	execute( TC_ms_rel_ind_does_not_cause_bssmap_reset() );

	execute( TC_dyn_pdch_ipa_act_deact() );
	execute( TC_dyn_pdch_ipa_act_nack() );
	execute( TC_dyn_pdch_osmo_act_deact() );
	execute( TC_dyn_pdch_osmo_act_nack() );

	execute( TC_chopped_ipa_ping() );
	execute( TC_chopped_ipa_payload() );

	/* Power control related */
	execute( TC_assignment_verify_ms_power_params_ie() );

	/* MSC pooling */
	/* FIXME: in SCCPlite, indicating how many MSCs should be connected does currently not work. Since
	 * RESET->RESET-ACK is unconditionally negotiated for all configured MSCs, they always all appear as connected
	 * to osmo-bsc. The MSC pooling tests however require disconnecting selected MSCs, and hence don't work out as
	 * intended on SCCPlite. So for now, run these only for SCCP/M3UA. */
	if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
		execute( TC_mscpool_L3Compl_on_1_msc() );
		execute( TC_mscpool_L3Complete_by_imsi_round_robin() );
		execute( TC_mscpool_LU_by_tmsi_null_nri_0_round_robin() );
		execute( TC_mscpool_LU_by_tmsi_null_nri_1_round_robin() );
		execute( TC_mscpool_L3Complete_by_tmsi_unassigned_nri_round_robin() );
		execute( TC_mscpool_L3Complete_by_tmsi_valid_nri_msc_not_connected_round_robin() );
		execute( TC_mscpool_L3Complete_by_tmsi_valid_nri_1() );
		execute( TC_mscpool_L3Complete_by_tmsi_valid_nri_2() );
		execute( TC_mscpool_LU_by_tmsi_from_other_PLMN() );
		execute( TC_mscpool_paging_and_response_imsi() );
		execute( TC_mscpool_paging_and_response_tmsi() );
		execute( TC_mscpool_no_allow_attach_round_robin() );
		execute( TC_mscpool_no_allow_attach_valid_nri() );
	}

	/* at bottom as they might crash OsmoBSC before OS#3182 is fixed */
	execute( TC_early_conn_fail() );
	execute( TC_late_conn_fail() );

	/* Emergency call handling (deny / allow) */
	execute( TC_assignment_emerg_setup_allow() );
	execute( TC_assignment_emerg_setup_deny_msc() );
	execute( TC_assignment_emerg_setup_deny_bts() );
	execute( TC_emerg_premption() );

	/* Frequency hopping parameters handling */
	execute( TC_fh_params_chan_activ() );
	execute( TC_fh_params_imm_ass() );
	execute( TC_fh_params_assignment_cmd() );
	execute( TC_fh_params_handover_cmd() );
	execute( TC_fh_params_si4_cbch() );

	if (mp_enable_lcs_tests) {
		execute( TC_lcs_loc_req_for_active_ms() );
		execute( TC_lcs_loc_req_for_active_ms_ta_req() );
		execute( TC_lcs_loc_req_for_idle_ms() );
		execute( TC_lcs_loc_req_no_subscriber() );
		execute( TC_lcs_loc_req_for_active_ms_le_timeout() );
		execute( TC_lcs_loc_req_for_active_ms_le_timeout2() );
		execute( TC_lcs_loc_req_for_idle_ms_no_pag_resp() );
		execute( TC_cm_service_during_lcs_loc_req() );
		execute( TC_ho_during_lcs_loc_req() );
	}
}

}