refactor subscr_conn and subscr_conn_fsm de-/alloc Refactor: 1. Glue the gsm_subscriber_connection alloc to the subscr_conn_fsm. 2. Add separate AUTH_CIPH state to the FSM. 3. Use conn->use_count to trigger conn release. 4. Add separate RELEASING state to the FSM. 5. Add rate counters for each of the three Complete Layer 3 types. Details: 1. Glue the gsm_subscriber_connection alloc to the subscr_conn_fsm. Historically, a gsm_subscriber_connection was allocated in libbsc land, and only upon Complete Layer 3 did libmsc add the fsm instance. After splitting openbsc.git into a separate osmo-msc, this is no longer necessary, hence: Closely tie gsm_subscriber_connection allocation to the subscr_conn_fsm instance: talloc the conn as a child of the FSM instance, and discard the conn as soon as the FSM terminates. 2. Add separate AUTH_CIPH state to the FSM. Decoding the Complete Layer 3 message is distinctly separate from waiting for the VLR FSMs to conclude. Use the NEW state as "we don't know if this is a valid message yet", and the AUTH_CIPH state as "evaluating, don't release". A profound effect of this: should we for any odd reason fail to leave the FSM's NEW state, the conn will be released right at the end of msc_compl_l3(), without needing to trigger release in each code path. 3. Use conn->use_count to trigger conn release. Before, the FSM itself would hold a use count on the conn, and hence we would need to ask it whether it is ready to release the conn yet by dispatching events, to achieve a use_count decrement. Instead, unite the FSM instance and conn, and do not hold a use count by the FSM. Hence, trigger an FSM "UNUSED" event only when the use_count reaches zero. As long as use counts are done correctly, the FSM will terminate correctly. These exceptions: - The new AUTH_CIPH state explicitly ignores UNUSED events, since we expect the use count to reach zero while evaluating Authentication and Ciphering. (I experimented with holding a use count by AUTH_CIPH onenter() and releasing by onleave(), but the use count and thus the conn are released before the next state can initiate transactions that would increment the use count again. Same thing for the VLR FSMs holding a use count, they should be done before we advance to the next state. The easiest is to simply expect zero use count during the AUTH_CIPH state.) - A CM Service Request means that even though the MSC would be through with all it wants to do, we shall still wait for a request to follow from the MS. Hence the FSM holds a use count on itself while a CM Service is pending. - While waiting for a Release/Clear Complete, the FSM holds a use count on itself. 4. Add separate RELEASING state to the FSM. If we decide to release for other reasons than a use count reaching zero, we still need to be able to wait for the msc_dtap() use count on the conn to release. (An upcoming patch will further use the RELEASING state to properly wait for Clear Complete / Release Complete messages.) 5. Add rate counters for each of the three Complete Layer 3 types. Besides LU, also count CM Service Request and Paging Response acceptance/rejections. Without these counters, only very few of the auth+ciph outcomes actually show in the counters. Related: OS#3122 Change-Id: I55feb379e176a96a831e105b86202b17a0ffe889

commit: e3d3dc6ea218a07161eeb80ae864a96bef2d8e61 [log] [tgz]
author: Neels Hofmeyr <neels@hofmeyr.de> Sat Mar 31 00:02:14 2018 +0200
committer: Harald Welte <laforge@gnumonks.org> Wed Apr 11 21:39:44 2018 +0000
tree: b0d8bddeda0835e20b4d0592184a4ec2befe7d07
parent: dc2514b22062af04354c0331f0f5819051c3fdee [diff] [blame]
diff --git a/tests/msc_vlr/msc_vlr_test_call.err b/tests/msc_vlr/msc_vlr_test_call.err
index 1b8002b..1da80d9 100644
--- a/tests/msc_vlr/msc_vlr_test_call.err
+++ b/tests/msc_vlr/msc_vlr_test_call.err

@@ -6,12 +6,9 @@
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 23/23
@@ -32,8 +29,11 @@
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 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
@@ -53,7 +53,7 @@
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -72,8 +72,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -140,7 +141,7 @@
 msc_subscr_conn_is_accepted() == false
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -153,25 +154,28 @@
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -184,13 +188,10 @@
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, 2nd auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -210,15 +211,18 @@
 - ...autn=1843a645b98d00005b2d666af46c45d9
 - ...expecting res=7db47cf7f81e4dc7
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - needs auth, not yet accepted
 msc_subscr_conn_is_accepted() == false
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -238,8 +242,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -255,23 +260,23 @@
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 ---
 - a call is initiated
 - SETUP gets forwarded to MNCC
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_SETUP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message GSM48_MT_CC_SETUP (0x3:0x5)
 DCC Unknown transaction ID 8, creating new trans.
 DCC (ti 08 sub MSISDN:42342 callref 80000001) New transaction
 DREF VLR subscr MSISDN:42342 usage increases to: 3
-DREF MSISDN:42342: MSC conn use + trans_cc == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + trans_cc == 3 (0x1a)
 DMM MSISDN:42342: rx msg GSM48_MT_CC_SETUP: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 2 (0x12)
 DCC (ti 08 sub MSISDN:42342) new state NULL -> INITIATED
 DCC Subscriber MSISDN:42342 (42342) sends SETUP to 123
 DMNCC transmit message MNCC_SETUP_IND
@@ -279,9 +284,7 @@
   MSC --> MNCC: callref 0x80000001: MNCC_SETUP_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - MNCC says that's fine
 DMNCC receive message MNCC_CALL_PROC_REQ
 DCC (ti 08 sub 42342) Received 'MNCC_CALL_PROC_REQ' from MNCC in state 1 (INITIATED)
@@ -307,7 +310,7 @@
 - DTAP matches expected message
 - Total time passed: 2.000046 s
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_CONNECT_ACK
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_CONNECT_ACK (0x3:0xf)
 DCC stopping pending timer T313
 DCC (ti 08 sub MSISDN:42342) new state CONNECT_IND -> ACTIVE
@@ -315,25 +318,21 @@
 DCC Sending 'MNCC_SETUP_COMPL_IND' to MNCC.
   MSC --> MNCC: callref 0x80000001: MNCC_SETUP_COMPL_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 ---
 - RTP stream goes ahead, not shown here.
 - Total time passed: 125.000091 s
 ---
 - Call ends
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_DISCONNECT
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_DISCONNECT (0x3:0x25)
 DCC (ti 08 sub MSISDN:42342) new state ACTIVE -> DISCONNECT_IND
 DMNCC transmit message MNCC_DISC_IND
 DCC Sending 'MNCC_DISC_IND' to MNCC.
   MSC --> MNCC: callref 0x80000001: MNCC_DISC_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 DMNCC receive message MNCC_REL_REQ
 DCC (ti 08 sub 42342) Received 'MNCC_REL_REQ' from MNCC in state 12 (DISCONNECT_IND)
 DCC starting timer T308 with 10 seconds
@@ -342,7 +341,7 @@
 - DTAP --RAN_UTRAN_IU--> MS: GSM48_MT_CC_RELEASE: 832d
 - DTAP matches expected message
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_RELEASE_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_RELEASE_COMPL (0x3:0x2a)
 DCC stopping pending timer T308
 DMNCC transmit message MNCC_REL_CNF
@@ -351,23 +350,27 @@
   MS <--Call Release-- MSC: subscr=MSISDN:42342 callref=0x0
 DCC (ti 08 sub MSISDN:42342) new state RELEASE_REQ -> NULL
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DREF MSISDN:42342: MSC conn use - trans_cc == 2 (0x6)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - trans_cc == 1 (0x2)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   llist_count(&net->subscr_conns) == 0
 DREF freeing VLR subscr MSISDN:42342
 ===== test_call_mo: SUCCESS
@@ -380,12 +383,9 @@
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 23/23
@@ -406,8 +406,11 @@
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 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
@@ -427,7 +430,7 @@
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -446,8 +449,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -514,7 +518,7 @@
 msc_subscr_conn_is_accepted() == false
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -527,25 +531,28 @@
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -570,13 +577,10 @@
 - MS replies with Paging Response, and VLR sends Auth Request
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_RR_PAG_RESP
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_RR_PAG_RESP (0x6:0x27)
 DRR PAGING RESPONSE: MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from PAGING_RESP
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -596,12 +600,15 @@
 - ...autn=1843a645b98d00005b2d666af46c45d9
 - ...expecting res=7db47cf7f81e4dc7
 DREF VLR subscr MSISDN:42342 usage decreases to: 4
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -621,8 +628,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
 - MS sends SecurityModeControl acceptance, VLR accepts, sends CC Setup
 DMM <- SECURITY MODE COMPLETE MSISDN:42342
@@ -637,23 +645,22 @@
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
 DPAG Paging success for MSISDN:42342 (event=0)
 DPAG Calling paging cbfn.
 DCC Paging subscr 42342 succeeded!
-DREF MSISDN:42342: MSC conn use + trans_cc == 2 (0xc)
+DREF MSISDN:42342: MSC conn use + trans_cc == 1 (0x10)
 DCC starting timer T303 with 30 seconds
 DCC (ti 00 sub MSISDN:42342) new state NULL -> CALL_PRESENT
 DMSC msc_tx 2 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: GSM48_MT_CC_SETUP: 0305
 - DTAP matches expected message
 DREF VLR subscr MSISDN:42342 usage decreases to: 3
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: connection still has active transaction: CC
   paging_stopped == 1
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_CALL_CONF
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_CALL_CONF (0x3:0x8)
 DCC stopping pending timer T303
 DCC starting timer T310 with 30 seconds
@@ -664,12 +671,10 @@
   MSC --> MNCC: callref 0x423: MNCC_CALL_CONF_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - Total time passed: 1.000023 s
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_ALERTING
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_ALERTING (0x3:0x1)
 DCC stopping pending timer T310
 DCC starting timer T301 with 180 seconds
@@ -678,12 +683,10 @@
 DCC Sending 'MNCC_ALERT_IND' to MNCC.
   MSC --> MNCC: callref 0x423: MNCC_ALERT_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - Total time passed: 2.000046 s
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_CONNECT
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_CONNECT (0x3:0x7)
 DCC stopping pending timer T301
 DCC (ti 00 sub MSISDN:42342) new state CALL_RECEIVED -> CONNECT_REQUEST
@@ -691,9 +694,7 @@
 DCC Sending 'MNCC_SETUP_CNF' to MNCC.
   MSC --> MNCC: callref 0x423: MNCC_SETUP_CNF
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 DMNCC receive message MNCC_SETUP_COMPL_REQ
 DCC (ti 00 sub 42342) Received 'MNCC_SETUP_COMPL_REQ' from MNCC in state 8 (CONNECT_REQUEST)
 DCC (ti 00 sub MSISDN:42342) new state CONNECT_REQUEST -> ACTIVE
@@ -706,16 +707,14 @@
 ---
 - Call ends
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_DISCONNECT
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_DISCONNECT (0x3:0x25)
 DCC (ti 00 sub MSISDN:42342) new state ACTIVE -> DISCONNECT_IND
 DMNCC transmit message MNCC_DISC_IND
 DCC Sending 'MNCC_DISC_IND' to MNCC.
   MSC --> MNCC: callref 0x423: MNCC_DISC_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 DMNCC receive message MNCC_REL_REQ
 DCC (ti 00 sub 42342) Received 'MNCC_REL_REQ' from MNCC in state 12 (DISCONNECT_IND)
 DCC starting timer T308 with 10 seconds
@@ -724,7 +723,7 @@
 - DTAP --RAN_UTRAN_IU--> MS: GSM48_MT_CC_RELEASE: 032d
 - DTAP matches expected message
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_RELEASE_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_RELEASE_COMPL (0x3:0x2a)
 DCC stopping pending timer T308
 DMNCC transmit message MNCC_REL_CNF
@@ -733,23 +732,27 @@
   MS <--Call Release-- MSC: subscr=MSISDN:42342 callref=0x0
 DCC (ti 00 sub MSISDN:42342) new state RELEASE_REQ -> NULL
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DREF MSISDN:42342: MSC conn use - trans_cc == 2 (0x6)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - trans_cc == 1 (0x2)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   llist_count(&net->subscr_conns) == 0
 DREF freeing VLR subscr MSISDN:42342
 ===== test_call_mt: SUCCESS
@@ -762,12 +765,9 @@
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 23/23
@@ -788,8 +788,11 @@
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 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
@@ -809,7 +812,7 @@
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -828,8 +831,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -896,7 +900,7 @@
 msc_subscr_conn_is_accepted() == false
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -909,25 +913,28 @@
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -952,13 +959,10 @@
 - MS replies with Paging Response, and VLR sends Auth Request
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_RR_PAG_RESP
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_RR_PAG_RESP (0x6:0x27)
 DRR PAGING RESPONSE: MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from PAGING_RESP
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -978,12 +982,15 @@
 - ...autn=1843a645b98d00005b2d666af46c45d9
 - ...expecting res=7db47cf7f81e4dc7
 DREF VLR subscr MSISDN:42342 usage decreases to: 4
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1003,8 +1010,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
 - MS sends SecurityModeControl acceptance, VLR accepts, sends CC Setup
 DMM <- SECURITY MODE COMPLETE MSISDN:42342
@@ -1019,23 +1027,22 @@
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
 DPAG Paging success for MSISDN:42342 (event=0)
 DPAG Calling paging cbfn.
 DCC Paging subscr 42342 succeeded!
-DREF MSISDN:42342: MSC conn use + trans_cc == 2 (0xc)
+DREF MSISDN:42342: MSC conn use + trans_cc == 1 (0x10)
 DCC starting timer T303 with 30 seconds
 DCC (ti 00 sub MSISDN:42342) new state NULL -> CALL_PRESENT
 DMSC msc_tx 2 bytes to MSISDN:42342 via RAN_UTRAN_IU
 - DTAP --RAN_UTRAN_IU--> MS: GSM48_MT_CC_SETUP: 0305
 - DTAP matches expected message
 DREF VLR subscr MSISDN:42342 usage decreases to: 3
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: connection still has active transaction: CC
   paging_stopped == 1
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_CALL_CONF
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_CALL_CONF (0x3:0x8)
 DCC stopping pending timer T303
 DCC starting timer T310 with 30 seconds
@@ -1046,12 +1053,10 @@
   MSC --> MNCC: callref 0x423: MNCC_CALL_CONF_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - Total time passed: 1.000023 s
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_ALERTING
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_ALERTING (0x3:0x1)
 DCC stopping pending timer T310
 DCC starting timer T301 with 180 seconds
@@ -1060,19 +1065,15 @@
 DCC Sending 'MNCC_ALERT_IND' to MNCC.
   MSC --> MNCC: callref 0x423: MNCC_ALERT_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - Total time passed: 16.000046 s
 - The call failed, the BSC sends a BSSMAP Clear Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_CN_CLOSE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
-DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
-DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
-DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
-DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Close event, cause 0
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x110)
+DREF VLR subscr MSISDN:42342 usage increases to: 4
+DREF VLR subscr MSISDN:42342 usage decreases to: 3
 DCC stopping pending timer T301
   MS <--Call Release-- MSC: subscr=MSISDN:42342 callref=0x423
 DMNCC receive message MNCC_REL_REQ
@@ -1088,10 +1089,17 @@
 DCC stopping pending timer T308
 DCC (ti 00 sub MSISDN:42342) new state RELEASE_REQ -> NULL
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DREF MSISDN:42342: MSC conn use - trans_cc == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - trans_cc == 1 (0x100)
 - Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
+DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
+DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
+DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
+DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
+DRLL MSISDN:42342: Freeing subscriber connection
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
@@ -1108,12 +1116,9 @@
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 23/23
@@ -1134,8 +1139,11 @@
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 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
@@ -1155,7 +1163,7 @@
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1174,8 +1182,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -1242,7 +1251,7 @@
 msc_subscr_conn_is_accepted() == false
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -1255,25 +1264,28 @@
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -1286,13 +1298,10 @@
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, 2nd auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1312,15 +1321,18 @@
 - ...autn=1843a645b98d00005b2d666af46c45d9
 - ...expecting res=7db47cf7f81e4dc7
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - needs auth, not yet accepted
 msc_subscr_conn_is_accepted() == false
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1340,8 +1352,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1357,23 +1370,23 @@
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 ---
 - a call is initiated
 - SETUP gets forwarded to MNCC
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_SETUP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message GSM48_MT_CC_SETUP (0x3:0x5)
 DCC Unknown transaction ID 8, creating new trans.
 DCC (ti 08 sub MSISDN:42342 callref 80000002) New transaction
 DREF VLR subscr MSISDN:42342 usage increases to: 3
-DREF MSISDN:42342: MSC conn use + trans_cc == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + trans_cc == 3 (0x1a)
 DMM MSISDN:42342: rx msg GSM48_MT_CC_SETUP: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 2 (0x12)
 DCC (ti 08 sub MSISDN:42342) new state NULL -> INITIATED
 DCC Subscriber MSISDN:42342 (42342) sends SETUP to 123
 DMNCC transmit message MNCC_SETUP_IND
@@ -1381,9 +1394,7 @@
   MSC --> MNCC: callref 0x80000002: MNCC_SETUP_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - MNCC says that's fine
 DMNCC receive message MNCC_CALL_PROC_REQ
 DCC (ti 08 sub 42342) Received 'MNCC_CALL_PROC_REQ' from MNCC in state 1 (INITIATED)
@@ -1406,7 +1417,7 @@
 - DTAP --RAN_UTRAN_IU--> MS: GSM48_MT_CC_RELEASE: 832d
 - DTAP matches expected message
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_RELEASE_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x12)
 DRLL Dispatching 04.08 message GSM48_MT_CC_RELEASE_COMPL (0x3:0x2a)
 DCC stopping pending timer T308
 DMNCC transmit message MNCC_REL_CNF
@@ -1415,23 +1426,27 @@
   MS <--Call Release-- MSC: subscr=MSISDN:42342 callref=0x0
 DCC (ti 08 sub MSISDN:42342) new state RELEASE_REQ -> NULL
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DREF MSISDN:42342: MSC conn use - trans_cc == 2 (0x6)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - trans_cc == 1 (0x2)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_COMMUNICATING
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   llist_count(&net->subscr_conns) == 0
 DREF freeing VLR subscr MSISDN:42342
 ===== test_call_mo_to_unknown: SUCCESS
@@ -1444,12 +1459,9 @@
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from LU
 DMM LOCATION UPDATING REQUEST: MI(IMSI)=901700000010650 type=NORMAL
 DMM LU/new-LAC: 23/23
@@ -1470,8 +1482,11 @@
 DVLR GSUP tx: 08010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST: 08010809710000000156f0
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_NEEDS_AUTH}: state_chg to VLR_SUB_AS_NEEDS_AUTH_WAIT_AI
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 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
@@ -1491,7 +1506,7 @@
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
+DREF IMSI:901700000010650: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM UMTS AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1510,8 +1525,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=27497388b6cb044648f396aa155b95ef
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
-DMM IMSI:901700000010650: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
+DREF IMSI:901700000010650: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -1578,7 +1594,7 @@
 msc_subscr_conn_is_accepted() == false
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_TMSI_REALL_COMPL (0x5:0x1b)
 DMM TMSI Reallocation Completed. Subscriber: MSISDN:42342
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: Received Event VLR_ULA_E_NEW_TMSI_ACK
@@ -1591,25 +1607,28 @@
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Freeing instance
 DVLR lu_compl_vlr_fsm(901700000010650){LU_COMPL_VLR_S_DONE}: Deallocated
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_LU_COMPL}: state_chg to VLR_ULA_S_DONE
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 2 (0x102)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 1 (0x2)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: fsm_lu_cleanup called with cause OSMO_FSM_TERM_PARENT
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Freeing instance
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
+DRLL MSISDN:42342: Freeing subscriber connection
+DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
-DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
-DREF VLR subscr MSISDN:42342 usage decreases to: 1
   iu_release_sent == 1
 - LU was successful, and the conn has already been closed
   llist_count(&net->subscr_conns) == 0
@@ -1622,13 +1641,10 @@
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, 2nd auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
+DMM Subscr_Conn{SUBSCR_CONN_S_NEW}: Allocated
 DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000010650
-DREF unknown: MSC conn use + fsm == 2 (0x5)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Allocated
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_INIT}: state_chg to SUBSCR_CONN_S_NEW
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Updated ID from CM_SERVICE_REQ
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: Allocated
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_INIT}: is child of Subscr_Conn(901700000010650)
@@ -1648,15 +1664,18 @@
 - ...autn=1843a645b98d00005b2d666af46c45d9
 - ...expecting res=7db47cf7f81e4dc7
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_COMPLETE_LAYER_3
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_AUTH_CIPH
+DREF MSISDN:42342: MSC conn use - compl_l3 == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   cm_service_result_sent == 0
   auth_request_sent == 1
 - needs auth, not yet accepted
 msc_subscr_conn_is_accepted() == false
 - MS sends Authen Response, VLR accepts and sends SecurityModeControl
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 1 (0x2)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM UMTS AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1676,8 +1695,9 @@
 - sending SecurityModeControl for UE ctx 42 send_ck=0 new_key=1
 - ...ik=1159ec926a50e98c034a6b7d7c9f418d
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
-DMM MSISDN:42342: subscr_conn_release_when_unused: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
+DREF MSISDN:42342: MSC conn use - dtap == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Awaiting results for Auth+Ciph, overruling event SUBSCR_CONN_E_UNUSED
   security_mode_ctrl_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1693,23 +1713,23 @@
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: proc_arq_fsm_done(VLR_PR_ARQ_RES_PASSED)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_CIPH}: state_chg to PR_ARQ_S_DONE
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Process Access Request result: VLR_PR_ARQ_RES_PASSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: Received Event SUBSCR_CONN_E_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_NEW}: state_chg to SUBSCR_CONN_S_ACCEPTED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: received_cm_service_request = true
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_release_when_unused: still awaiting first request after a CM Service Request
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: Received Event SUBSCR_CONN_E_ACCEPTED
+DREF MSISDN:42342: MSC conn use + cm_service == 1 (0x8)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_AUTH_CIPH}: state_chg to SUBSCR_CONN_S_ACCEPTED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: subscr_conn_fsm_has_active_transactions: still awaiting first request after a CM Service Request
   cm_service_result_sent == 0
 ---
 - a call is initiated
 - SETUP gets forwarded to MNCC
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_CC_SETUP
-DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0xa)
 DRLL Dispatching 04.08 message GSM48_MT_CC_SETUP (0x3:0x5)
 DCC Unknown transaction ID 8, creating new trans.
 DCC (ti 08 sub MSISDN:42342 callref 80000003) New transaction
 DREF VLR subscr MSISDN:42342 usage increases to: 3
-DREF MSISDN:42342: MSC conn use + trans_cc == 3 (0xe)
+DREF MSISDN:42342: MSC conn use + trans_cc == 3 (0x1a)
 DMM MSISDN:42342: rx msg GSM48_MT_CC_SETUP: received_cm_service_request changes to false
+DREF MSISDN:42342: MSC conn use - cm_service == 2 (0x12)
 DCC (ti 08 sub MSISDN:42342) new state NULL -> INITIATED
 DCC Subscriber MSISDN:42342 (42342) sends SETUP to 123
 DMNCC transmit message MNCC_SETUP_IND
@@ -1717,9 +1737,7 @@
   MSC --> MNCC: callref 0x80000003: MNCC_SETUP_IND
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: state_chg to SUBSCR_CONN_S_COMMUNICATING
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: connection still has active transaction: CC
-DREF MSISDN:42342: MSC conn use - dtap == 2 (0xc)
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x10)
 - MNCC says that's fine
 DMNCC receive message MNCC_CALL_PROC_REQ
 DCC (ti 08 sub 42342) Received 'MNCC_CALL_PROC_REQ' from MNCC in state 1 (INITIATED)
@@ -1750,19 +1768,22 @@
   MSC --> MNCC: callref 0x80000003: MNCC_REL_CNF
 DCC (ti 08 sub MSISDN:42342) new state RELEASE_REQ -> NULL
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
-DREF MSISDN:42342: MSC conn use - trans_cc == 1 (0x4)
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_RELEASE_WHEN_UNUSED
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: subscr_conn_fsm_release_when_unused: releasing conn
-DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASED
+DREF MSISDN:42342: MSC conn use - trans_cc == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_COMMUNICATING}: state_chg to SUBSCR_CONN_S_RELEASING
+DREF MSISDN:42342: MSC conn use + release == 1 (0x100)
+DREF VLR subscr MSISDN:42342 usage increases to: 3
+DREF VLR subscr MSISDN:42342 usage decreases to: 2
+- Iu Release --RAN_UTRAN_IU--> MS
+DREF MSISDN:42342: MSC conn use - release == 0 (0x0)
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: Received Event SUBSCR_CONN_E_UNUSED
+DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASING}: state_chg to SUBSCR_CONN_S_RELEASED
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Terminating (cause = OSMO_FSM_TERM_PARENT)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Removing from parent Subscr_Conn(901700000010650)
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instance
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Deallocated
-DMM msc_subscr_conn_close(vsub=MSISDN:42342, cause=2): no conn fsm, releasing directly without release event.
-- Iu Release --RAN_UTRAN_IU--> MS
-DREF MSISDN:42342: MSC conn use - fsm == 0 (0x0)
-DRLL subscr MSISDN:42342: Freeing subscriber connection
+DRLL MSISDN:42342: Freeing subscriber connection
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Freeing instance
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_RELEASED}: Deallocated
commit	e3d3dc6ea218a07161eeb80ae864a96bef2d8e61	[log] [tgz]
author	Neels Hofmeyr <neels@hofmeyr.de>	Sat Mar 31 00:02:14 2018 +0200
committer	Harald Welte <laforge@gnumonks.org>	Wed Apr 11 21:39:44 2018 +0000
tree	b0d8bddeda0835e20b4d0592184a4ec2befe7d07
parent	dc2514b22062af04354c0331f0f5819051c3fdee [diff] [blame]