diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 784375a..c7a6e38 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -59,6 +59,9 @@
 
 import from SCCPasp_Types all;
 
+import from GSM_SystemInformation all;
+import from GSM_RestOctets all;
+
 const integer NUM_BTS := 3;
 const integer NUM_MSC := 3;
 const float T3101_MAX := 12.0;
@@ -84,6 +87,358 @@
 	{ "mscpool:subscr:paged", 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,
+	record of SI2quaterRestOctets 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 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 := 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];
@@ -117,6 +472,9 @@
 	timer T_guard := 30.0;
 
 	var CounterNameValsList g_ctr_msc;
+
+	/* System Information bytes as received during RSL startup, for each RSL[idx]. */
+	var SystemInformationConfig_list g_system_information := {};
 }
 
 modulepar {
@@ -425,6 +783,54 @@
 	f_vty_transceive(BSCVTY, "logp lglobal notice " & 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;
+		}
+}
+
 /* 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).
@@ -484,6 +890,32 @@
 	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 RSL_Message t_rx, float t_secs := 2.0, IpaStreamId sid := IPAC_PROTO_RSL_TRX0)
 runs on test_CT return RSL_Message {
@@ -1273,8 +1705,10 @@
 	setverdict(pass);
 }
 
-
-
+testcase TC_si_default() runs on test_CT {
+	f_init(0);
+	f_init_bts_and_check_sysinfo(0, expect_si := SystemInformationConfig_default);
+}
 
 testcase TC_ctrl_msc_connection_status() runs on test_CT {
 	var charstring ctrl_resp;
@@ -5237,6 +5671,8 @@
 		execute( TC_ctrl_location() );
 	}
 
+	execute( TC_si_default() );
+
 	/* RSL DCHAN Channel ACtivation / Deactivation */
 	execute( TC_chan_act_noreply() );
 	execute( TC_chan_act_counter() );