subscr_conn: introduce usage tokens for ref error tracking

When hunting a conn use count bug, it was very hard to figure out who's (not)
using the conn. To ease tracking down this bug and future bugs, explicitly name
what a conn is being reserved for, and track in a bit mask.

Show in the DREF logs what uses and un-uses a conn. See the test expectation
updates, which nicely show how that clarifies the state of the conn in the
logs.

On errors, log them, but don't fail hard: if one conn use/un-use fails, we
don't want to crash the entire MSC before we have to.

Change-Id: I259aa0eec41efebb4c8221275219433eafaa549b

1 files changed, 156 insertions, 156 deletions

diff --git a/tests/msc_vlr/msc_vlr_test_authen_reuse.err b/tests/msc_vlr/msc_vlr_test_authen_reuse.err
index 2677b8dd2..7149d83fe 100644
--- a/tests/msc_vlr/msc_vlr_test_authen_reuse.err
+++ b/tests/msc_vlr/msc_vlr_test_authen_reuse.err
@@ -2,9 +2,9 @@
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -28,7 +28,7 @@ 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: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -48,7 +48,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + 1 == 2
+DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -72,7 +72,7 @@ DVLR GSUP tx: 04010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000000156f0
 DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
 DMM IMSI:901700000010650: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
   gsup_tx_confirmed == 1
   lu_result_sent == 0
 - HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
@@ -138,7 +138,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 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
@@ -165,10 +165,10 @@ 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -183,10 +183,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -209,12 +209,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -246,13 +246,13 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_GERAN_A-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -272,10 +272,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -290,10 +290,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -313,7 +313,7 @@ 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
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -335,7 +335,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -367,13 +367,13 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_GERAN_A-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -393,10 +393,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -406,7 +406,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
-DREF unknown: MSC conn use + 1 == 1
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
 DREF VLR subscr MSISDN:42342 usage increases to: 2
@@ -416,7 +416,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
 DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF unknown: MSC conn use - 1 == 0
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
 DRLL Freeing subscriber connection with NULL subscriber
   bssap_clear_sent == 1
   llist_count(&net->subscr_conns) == 0
@@ -429,9 +429,9 @@ talloc_total_blocks(tall_bsc_ctx) == 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
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -455,7 +455,7 @@ 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: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -475,7 +475,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   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 + 1 == 2
+DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -492,7 +492,7 @@ DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: vlr_loc_upd_post_auth()
 - sending SecurityModeControl for IMSI:901700000010650
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
 DMM IMSI:901700000010650: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -574,7 +574,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 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
@@ -601,10 +601,10 @@ 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -619,10 +619,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -645,12 +645,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   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 + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -668,7 +668,7 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: _proc_arq_
 - sending SecurityModeControl for MSISDN:42342
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -695,7 +695,7 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting f
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_UTRAN_IU-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -715,10 +715,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -733,10 +733,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -756,7 +756,7 @@ 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
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -778,7 +778,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - 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 + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -796,7 +796,7 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: _proc_arq_
 - sending SecurityModeControl for MSISDN:42342
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -823,7 +823,7 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting f
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_UTRAN_IU-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -843,10 +843,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -856,7 +856,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
-DREF unknown: MSC conn use + 1 == 1
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
 DREF VLR subscr MSISDN:42342 usage increases to: 2
@@ -866,7 +866,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
 DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
 - Iu Release --RAN_UTRAN_IU--> MS
-DREF unknown: MSC conn use - 1 == 0
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
 DRLL Freeing subscriber connection with NULL subscriber
   iu_release_sent == 1
   llist_count(&net->subscr_conns) == 0
@@ -879,9 +879,9 @@ talloc_total_blocks(tall_bsc_ctx) == 9
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -905,7 +905,7 @@ 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: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -925,7 +925,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + 1 == 2
+DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -949,7 +949,7 @@ DVLR GSUP tx: 04010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000000156f0
 DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
 DMM IMSI:901700000010650: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
   gsup_tx_confirmed == 1
   lu_result_sent == 0
 - HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
@@ -1015,7 +1015,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 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
@@ -1042,10 +1042,10 @@ 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -1060,10 +1060,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1086,12 +1086,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1123,13 +1123,13 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_GERAN_A-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -1149,10 +1149,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -1167,10 +1167,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1193,12 +1193,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1230,13 +1230,13 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_GERAN_A-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -1256,10 +1256,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -1274,10 +1274,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1300,12 +1300,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 1
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1337,13 +1337,13 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_GERAN_A-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -1363,10 +1363,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -1376,7 +1376,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
-DREF unknown: MSC conn use + 1 == 1
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
 DREF VLR subscr MSISDN:42342 usage increases to: 2
@@ -1386,7 +1386,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
 DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF unknown: MSC conn use - 1 == 0
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
 DRLL Freeing subscriber connection with NULL subscriber
   bssap_clear_sent == 1
   llist_count(&net->subscr_conns) == 0
@@ -1399,9 +1399,9 @@ talloc_total_blocks(tall_bsc_ctx) == 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
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1425,7 +1425,7 @@ 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: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -1445,7 +1445,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   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 + 1 == 2
+DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1462,7 +1462,7 @@ DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: vlr_loc_upd_post_auth()
 - sending SecurityModeControl for IMSI:901700000010650
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
 DMM IMSI:901700000010650: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -1544,7 +1544,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 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
@@ -1571,10 +1571,10 @@ 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -1589,10 +1589,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1615,12 +1615,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   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 + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1638,7 +1638,7 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: _proc_arq_
 - sending SecurityModeControl for MSISDN:42342
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1665,7 +1665,7 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting f
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_UTRAN_IU-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -1685,10 +1685,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -1703,10 +1703,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1729,12 +1729,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   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 + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1752,7 +1752,7 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: _proc_arq_
 - sending SecurityModeControl for MSISDN:42342
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1779,7 +1779,7 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting f
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_UTRAN_IU-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -1799,10 +1799,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -1817,10 +1817,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and reuses old auth vector
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1843,12 +1843,12 @@ DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: got auth tuple: us
 - ...expecting res=e229c19e791f2e41
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   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 + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -1866,7 +1866,7 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: _proc_arq_
 - sending SecurityModeControl for MSISDN:42342
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -1893,7 +1893,7 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting f
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_UTRAN_IU-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -1913,10 +1913,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -1926,7 +1926,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
-DREF unknown: MSC conn use + 1 == 1
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
 DREF VLR subscr MSISDN:42342 usage increases to: 2
@@ -1936,7 +1936,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
 DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
 - Iu Release --RAN_UTRAN_IU--> MS
-DREF unknown: MSC conn use - 1 == 0
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
 DRLL Freeing subscriber connection with NULL subscriber
   iu_release_sent == 1
   llist_count(&net->subscr_conns) == 0
@@ -1949,9 +1949,9 @@ talloc_total_blocks(tall_bsc_ctx) == 9
 - Location Update request causes a GSUP Send Auth Info request to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -1975,7 +1975,7 @@ 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: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -1995,7 +1995,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF IMSI:901700000010650: MSC conn use + 1 == 2
+DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2019,7 +2019,7 @@ DVLR GSUP tx: 04010809710000000156f0
 GSUP --> HLR: OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST: 04010809710000000156f0
 DVLR upd_hlr_vlr_fsm(901700000010650){UPD_HLR_VLR_S_INIT}: state_chg to UPD_HLR_VLR_S_WAIT_FOR_DATA
 DMM IMSI:901700000010650: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
   gsup_tx_confirmed == 1
   lu_result_sent == 0
 - HLR sends _INSERT_DATA_REQUEST, VLR responds with _INSERT_DATA_RESULT
@@ -2085,7 +2085,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 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
@@ -2112,10 +2112,10 @@ 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -2130,10 +2130,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -2153,7 +2153,7 @@ 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
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -2175,7 +2175,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - MS sends Authen Response, VLR accepts with a CM Service Accept
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2207,13 +2207,13 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_BUMP
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting first request after a CM Service Request
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cm_service_result_sent == 1
 - a USSD request is serviced
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_GERAN_A-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -2233,10 +2233,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
   bssap_clear_sent == 1
@@ -2246,7 +2246,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
-DREF unknown: MSC conn use + 1 == 1
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
 DREF VLR subscr MSISDN:42342 usage increases to: 2
@@ -2256,7 +2256,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
 DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
 - BSSAP Clear --RAN_GERAN_A--> MS
-DREF unknown: MSC conn use - 1 == 0
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
 DRLL Freeing subscriber connection with NULL subscriber
   bssap_clear_sent == 1
   llist_count(&net->subscr_conns) == 0
@@ -2269,9 +2269,9 @@ talloc_total_blocks(tall_bsc_ctx) == 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
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -2295,7 +2295,7 @@ 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: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - compl_l3 == 1 (0x4)
   lu_result_sent == 0
 - from HLR, rx _SEND_AUTH_INFO_RESULT, only one tuple; VLR sends Auth Req to MS
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000000156f00362201039fa2f4e3d523d8619a73b4f65c3e14d21049b36efdf2208059a4f668f6fbe39231027497388b6cb044648f396aa155b95ef2410f64735036e5871319c679f4742a75ea125108704f5ba55f30000d2ee44b22c8ea9192708e229c19e791f2e41
@@ -2315,7 +2315,7 @@ DREF VLR subscr IMSI:901700000010650 usage decreases to: 1
   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 + 1 == 2
+DREF IMSI:901700000010650: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000010650: MM R99 AUTHENTICATION RESPONSE (res = e229c19e791f2e41)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2332,7 +2332,7 @@ DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: vlr_loc_upd_post_auth()
 - sending SecurityModeControl for IMSI:901700000010650
 DVLR vlr_lu_fsm(901700000010650){VLR_ULA_S_WAIT_AUTH}: state_chg to VLR_ULA_S_WAIT_CIPH
 DMM IMSI:901700000010650: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF IMSI:901700000010650: MSC conn use - 1 == 1
+DREF IMSI:901700000010650: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   lu_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts and sends GSUP LU Req to HLR
@@ -2414,7 +2414,7 @@ DREF VLR subscr MSISDN:42342 usage increases to: 2
 DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - MS sends TMSI Realloc Complete
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_TMSI_REALL_COMPL
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 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
@@ -2441,10 +2441,10 @@ 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -2459,10 +2459,10 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, and needs to request a second auth vector from HLR
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
-DREF unknown: MSC conn use + 1 == 1
+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 + 1 == 2
+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
@@ -2482,7 +2482,7 @@ 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
 DREF VLR subscr MSISDN:42342 usage decreases to: 2
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - compl_l3 == 1 (0x4)
   cm_service_result_sent == 0
   auth_request_sent == 0
   gsup_tx_confirmed == 1
@@ -2504,7 +2504,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 2
   cm_service_result_sent == 0
 - 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 + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM MSISDN:42342: MM R99 AUTHENTICATION RESPONSE (res = 7db47cf7f81e4dc7)
 DVLR VLR_Authenticate(901700000010650){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
@@ -2522,7 +2522,7 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: _proc_arq_
 - sending SecurityModeControl for MSISDN:42342
 DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_WAIT_AUTH}: state_chg to PR_ARQ_S_WAIT_CIPH
 DMM MSISDN:42342: bump: conn still being established (SUBSCR_CONN_S_NEW)
-DREF MSISDN:42342: MSC conn use - 1 == 1
+DREF MSISDN:42342: MSC conn use - dtap == 1 (0x4)
   cipher_mode_cmd_sent == 1
   cm_service_result_sent == 0
 - MS sends SecurityModeControl acceptance, VLR accepts; above Ciphering is an implicit CM Service Accept
@@ -2549,7 +2549,7 @@ DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: bump: still awaiting f
   expecting USSD:
   Your extension is 42342

   MSC <--RAN_UTRAN_IU-- MS: GSM48_PDISC_NC_SS:0x3b
-DREF MSISDN:42342: MSC conn use + 1 == 2
+DREF MSISDN:42342: MSC conn use + dtap == 2 (0x6)
 DRLL Dispatching 04.08 message GSM48_PDISC_NC_SS:0x3b (0xb:0x3b)
 DMM MSISDN:42342: rx msg GSM48_PDISC_NC_SS:0x3b: received_cm_service_request changes to false
 DMM Subscr_Conn(901700000010650){SUBSCR_CONN_S_ACCEPTED}: Received Event SUBSCR_CONN_E_COMMUNICATING
@@ -2569,10 +2569,10 @@ DVLR Process_Access_Request_VLR(901700000010650){PR_ARQ_S_DONE}: Freeing instanc
 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 - 1 == 1
+DREF MSISDN:42342: MSC conn use - fsm == 1 (0x2)
 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 - 1 == 0
+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
@@ -2582,7 +2582,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 1
 - subscriber detaches
   MSC <--RAN_UTRAN_IU-- MS: GSM48_MT_MM_IMSI_DETACH_IND
   new conn
-DREF unknown: MSC conn use + 1 == 1
+DREF unknown: MSC conn use + compl_l3 == 1 (0x1)
 DRLL Dispatching 04.08 message GSM48_MT_MM_IMSI_DETACH_IND (0x5:0x1)
 DMM IMSI DETACH INDICATION: MI(IMSI)=901700000010650
 DREF VLR subscr MSISDN:42342 usage increases to: 2
@@ -2592,7 +2592,7 @@ DREF VLR subscr MSISDN:42342 usage decreases to: 0
 DREF freeing VLR subscr MSISDN:42342
 DMM msc_subscr_conn_close(vsub=unknown, cause=0): no conn fsm, releasing directly without release event.
 - Iu Release --RAN_UTRAN_IU--> MS
-DREF unknown: MSC conn use - 1 == 0
+DREF unknown: MSC conn use - compl_l3 == 0 (0x0)
 DRLL Freeing subscriber connection with NULL subscriber
   iu_release_sent == 1
   llist_count(&net->subscr_conns) == 0