do CN CRCX first

In order to send the MSC's RTP endpoint IP address+port in the inital SDP, move the MGCP CRCX up to an earlier point in the sequence of establishing a voice call. Update the voice call sequence chart to show the effects. Related: SYS#5066 Change-Id: Ie433db1ba0c46d4b97538a969233c155cefac21c
author: Neels Hofmeyr <nhofmeyr@sysmocom.de> 2022-01-13 23:18:02 +0100
committer: Neels Hofmeyr <nhofmeyr@sysmocom.de> 2022-10-13 16:12:26 +0200
commit: d338b1e6f749c678307b2d0e6a58c4ab3f690b06 (patch)
tree: 15c01681a65f922968c210f0146faa186562b141
parent: 05236e6d68c1d3dfd2b60ed7f9024586bb73069d (diff)
7 files changed, 551 insertions, 289 deletions
diff --git a/doc/sequence_charts/voice_call_full.msc b/doc/sequence_charts/voice_call_full.msc
index 75fcef2ef..7a791a54f 100644
--- a/doc/sequence_charts/voice_call_full.msc
+++ b/doc/sequence_charts/voice_call_full.msc
@@ -11,22 +11,22 @@ moms =>> momsc	[label="RR CIPH_M_COMPL"];
 moms =>> momsc	[label="CC SETUP"];
 momsc note momsc	[label="CC starts guard timer (180s)"];
 momsc abox momsc	[label="CC state:\nINITIATED"];
+momgw <<= momsc	[label="for CN: CRCX\nrtpbridge/*@msc"];
+momgw =>> momsc	[label="for CN: CRCX OK\nEP-1 CI-1"];
+momgw <<= momsc	[label="for RAN: CRCX\nEP-1"];
 momsc =>> sip	[label="MNCC_SETUP_IND"];
-momsc <<= sip	[label="MNCC_RTP_CREATE"];
-momgw <<= momsc	[label="for RAN: CRCX\nrtpbridge/*@msc"];
-momgw =>> momsc	[label="for RAN: CRCX OK\nEP-1 CI-1"];
+momgw =>> momsc	[label="for RAN: CRCX OK\nEP-1 CI-2"];
 moms <<= momsc	[label="(BSSMAP) ASSIGNMENT_COMMAND"];
+momsc <<= sip	[label="MNCC_RTP_CREATE"];
 moms =>> momsc	[label="(BSSMAP) Assignment Complete"];
-momgw <<= momsc	[label="for RAN: MDCX\nEP-1 CI-1"];
-momgw =>> momsc	[label="for RAN: MDCX OK\nEP-1 CI-1"];
-momgw <<= momsc	[label="for CN: CRCX\nEP-1"];
-momgw =>> momsc	[label="for CN: CRCX OK\nEP-1 CI-2"];
+momgw <<= momsc	[label="for RAN: MDCX\nEP-1 CI-2"];
 momsc =>> sip	[label="MNCC_RTP_CREATE\nIP:port-1"];
 momsc <<= sip	[label="MNCC_CALL_PROC_REQ"];
 momsc note momsc	[label="CC stops guard timer"];
 momsc note momsc	[label="CC starts guard timer (180s)"];
 momsc abox momsc	[label="CC state:\nMO_CALL_PROC"];
 moms <<= momsc	[label="CC CALL_PROC"];
+momgw =>> momsc	[label="for RAN: MDCX OK\nEP-1 CI-2"];
 mtmsc <<= sip	[label="MNCC_SETUP_REQ"];
 mtms <<= mtmsc	[label="Paging"];
 mtms =>> mtmsc	[label="RR PAG_RESP"];
@@ -36,24 +36,25 @@ mtms =>> mtmsc	[label="MM AUTH_RESP"];
 mtms <<= mtmsc	[label="(RANAP) SecurityModeCommand"];
 mtms =>> mtmsc	[label="(RANAP) SecurityModeControl successfulOutcome"];
 mtms <<= mtmsc	[label="(RANAP) CommonId"];
-mtmsc note mtmsc	[label="CC starts timer T303 (30s)"];
 mtmsc abox mtmsc	[label="CC state:\nCALL_PRESENT"];
+mtmsc note mtmsc	[label="CC starts timer T303 (30s)"];
 mtms <<= mtmsc	[label="CC SETUP"];
 mtms =>> mtmsc	[label="CC CALL_CONF"];
 mtmsc note mtmsc	[label="CC stops timer T303"];
 mtmsc note mtmsc	[label="CC starts timer T310 (30s)"];
+mtmgw <<= mtmsc	[label="for CN: CRCX\nrtpbridge/*@msc"];
 mtmsc abox mtmsc	[label="CC state:\nMO_TERM_CALL_CONF"];
-mtmgw <<= mtmsc	[label="for RAN: CRCX\nrtpbridge/*@msc"];
 mtmsc =>> sip	[label="MNCC_CALL_CONF_IND"];
 mtmsc <<= sip	[label="MNCC_RTP_CREATE"];
-mtmgw =>> mtmsc	[label="for RAN: CRCX OK\nEP-2 CI-3"];
+mtmgw =>> mtmsc	[label="for CN: CRCX OK\nEP-2 CI-3"];
+mtmgw <<= mtmsc	[label="for RAN: CRCX\nEP-2"];
+mtmsc =>> sip	[label="MNCC_RTP_CREATE\nIP:port-2"];
+mtmgw =>> mtmsc	[label="for RAN: CRCX OK\nEP-2 CI-4"];
 mtms <<= mtmsc	[label="(RANAP) RAB AssignmentRequest"];
 mtms =>> mtmsc	[label="(RANAP) RAB Assignment Response"];
-mtmgw <<= mtmsc	[label="for RAN: MDCX\nEP-2 CI-3"];
-mtmgw =>> mtmsc	[label="for RAN: MDCX OK\nEP-2 CI-3"];
-mtmgw <<= mtmsc	[label="for CN: CRCX\nEP-2"];
-mtmgw =>> mtmsc	[label="for CN: CRCX OK\nEP-2 CI-4"];
+mtmgw <<= mtmsc	[label="for RAN: MDCX\nEP-2 CI-4"];
 mtmsc =>> sip	[label="MNCC_RTP_CREATE\nIP:port-2"];
+mtmgw =>> mtmsc	[label="for RAN: MDCX OK\nEP-2 CI-4"];
 mtms =>> mtmsc	[label="CC ALERTING"];
 mtmsc note mtmsc	[label="CC stops timer T310"];
 mtmsc note mtmsc	[label="CC starts timer T301 (180s)"];
@@ -68,55 +69,55 @@ mtms =>> mtmsc	[label="CC CONNECT"];
 mtmsc note mtmsc	[label="CC stops timer T301"];
 mtmsc abox mtmsc	[label="CC state:\nCONNECT_REQUEST"];
 mtmsc =>> sip	[label="MNCC_SETUP_CNF"];
-mtmsc <<= sip	[label="MNCC_RTP_CONNECT\nIP:port-1"];
-mtmgw <<= mtmsc	[label="for CN: MDCX\nEP-2 CI-4"];
+mtmsc <<= sip	[label="MNCC_RTP_CONNECT"];
+mtmgw <<= mtmsc	[label="for CN: MDCX\nEP-2 CI-3"];
 mtmsc <<= sip	[label="MNCC_SETUP_COMPL_REQ"];
 mtmsc note mtmsc	[label="CC starts guard timer (180s)"];
 mtmsc abox mtmsc	[label="CC state:\nACTIVE"];
 mtmsc note mtmsc	[label="CC stops guard timer"];
 mtms <<= mtmsc	[label="CC CONNECT_ACK"];
-mtmgw =>> mtmsc	[label="for CN: MDCX OK\nEP-2 CI-4"];
-momsc <<= sip	[label="MNCC_RTP_CONNECT\nIP:port-2"];
-momgw <<= momsc	[label="for CN: MDCX\nEP-1 CI-2"];
+mtmgw =>> mtmsc	[label="for CN: MDCX OK\nEP-2 CI-3"];
+momsc <<= sip	[label="MNCC_RTP_CONNECT"];
+momgw <<= momsc	[label="for CN: MDCX\nEP-1 CI-1"];
 momsc <<= sip	[label="MNCC_SETUP_RSP"];
 momsc note momsc	[label="CC stops guard timer"];
 momsc note momsc	[label="CC starts guard timer (180s)"];
 momsc note momsc	[label="CC starts timer T313 (30s)"];
 momsc abox momsc	[label="CC state:\nCONNECT_IND"];
 moms <<= momsc	[label="CC CONNECT"];
-momgw =>> momsc	[label="for CN: MDCX OK\nEP-1 CI-2"];
+momgw =>> momsc	[label="for CN: MDCX OK\nEP-1 CI-1"];
 moms =>> momsc	[label="CC CONNECT_ACK"];
 momsc note momsc	[label="CC stops timer T313"];
 momsc abox momsc	[label="CC state:\nACTIVE"];
 momsc note momsc	[label="CC stops guard timer"];
 momsc =>> sip	[label="MNCC_SETUP_COMPL_IND"];
-moms =>> momsc	[label="CC DISCONNECT"];
-momsc abox momsc	[label="CC state:\nDISCONNECT_IND"];
-momsc =>> sip	[label="MNCC_DISC_IND"];
-momsc <<= sip	[label="MNCC_REL_REQ"];
-momsc note momsc	[label="CC starts guard timer (180s)"];
-momsc note momsc	[label="CC starts timer T308 (10s)"];
-momsc abox momsc	[label="CC state:\nRELEASE_REQ"];
-moms <<= momsc	[label="CC RELEASE"];
-mtmsc <<= sip	[label="MNCC_DISC_REQ"];
-mtmsc note mtmsc	[label="CC starts guard timer (180s)"];
-mtmsc note mtmsc	[label="CC starts timer T306 (30s)"];
+mtms =>> mtmsc	[label="CC DISCONNECT"];
 mtmsc abox mtmsc	[label="CC state:\nDISCONNECT_IND"];
-mtms <<= mtmsc	[label="CC DISCONNECT"];
-moms =>> momsc	[label="CC RELEASE_COMPL"];
-momsc note momsc	[label="CC stops timer T308"];
+mtmsc =>> sip	[label="MNCC_DISC_IND"];
+mtmsc <<= sip	[label="MNCC_REL_REQ"];
+mtmsc note mtmsc	[label="CC starts guard timer (180s)"];
+mtmsc note mtmsc	[label="CC starts timer T308 (10s)"];
+mtmsc abox mtmsc	[label="CC state:\nRELEASE_REQ"];
+mtms <<= mtmsc	[label="CC RELEASE"];
+momsc <<= sip	[label="MNCC_DISC_REQ"];
+momsc note momsc	[label="CC starts guard timer (180s)"];
+momsc note momsc	[label="CC starts timer T306 (30s)"];
+momsc abox momsc	[label="CC state:\nDISCONNECT_IND"];
+moms <<= momsc	[label="CC DISCONNECT"];
+moms =>> momsc	[label="CC RELEASE"];
+momsc note momsc	[label="CC stops timer T306"];
+moms <<= momsc	[label="CC RELEASE_COMPL"];
 momsc abox momsc	[label="CC state:\nNULL"];
 momsc note momsc	[label="CC stops guard timer"];
 moms <<= momsc	[label="(BSSMAP) CLEAR_COMMAND"];
-momsc =>> sip	[label="MNCC_REL_CNF"];
+momsc =>> sip	[label="MNCC_REL_IND"];
 moms =>> momsc	[label="(BSSMAP) Clear Complete"];
-mtms =>> mtmsc	[label="CC RELEASE"];
-mtmsc note mtmsc	[label="CC stops timer T306"];
-mtms <<= mtmsc	[label="CC RELEASE_COMPL"];
+mtms =>> mtmsc	[label="CC RELEASE_COMPL"];
+mtmsc note mtmsc	[label="CC stops timer T308"];
 mtmsc abox mtmsc	[label="CC state:\nNULL"];
 mtmsc note mtmsc	[label="CC stops guard timer"];
 mtms <<= mtmsc	[label="(RANAP) Iu Release"];
-mtmsc =>> sip	[label="MNCC_REL_IND"];
+mtmsc =>> sip	[label="MNCC_REL_CNF"];
 mtms =>> mtmsc	[label="(RANAP) Iu Release successfulOutcome"];
 moms =>> momsc	[label="IMSI Detach"];
 mtms =>> mtmsc	[label="IMSI Detach"];
diff --git a/include/osmocom/msc/gsm_04_08.h b/include/osmocom/msc/gsm_04_08.h
index bfc8027db..d465357d6 100644
--- a/include/osmocom/msc/gsm_04_08.h
+++ b/include/osmocom/msc/gsm_04_08.h
@@ -45,6 +45,11 @@ int gsm48_send_rr_app_info(struct msc_a *msc_a, uint8_t apdu_id, uint8_t apdu_le
 int gsm48_send_rr_ass_cmd(struct gsm_lchan *dest_lchan, struct gsm_lchan *lchan, uint8_t power_class);
 int gsm48_send_ho_cmd(struct gsm_lchan *old_lchan, struct gsm_lchan *new_lchan, uint8_t power_command, uint8_t ho_ref);
 
+void gsm48_cc_rx_setup_cn_local_rtp_port_known(struct gsm_trans *trans);
+void gsm48_cc_rx_call_conf_cn_local_rtp_port_known(struct gsm_trans *trans);
+int cc_cn_local_rtp_port_known(struct gsm_trans *trans);
+int cc_assignment_done(struct gsm_trans *trans);
+
 int mncc_tx_to_cc(struct gsm_network *net, void *arg);
 
 /* convert a ASCII phone number to call-control BCD */
diff --git a/include/osmocom/msc/msc_a.h b/include/osmocom/msc/msc_a.h
index b4dfef035..48d86d1b1 100644
--- a/include/osmocom/msc/msc_a.h
+++ b/include/osmocom/msc/msc_a.h
@@ -208,6 +208,7 @@ void msc_a_up_ciph_res(struct msc_a *msc_a, bool success, const char *imeisv);
 bool msc_a_is_accepted(const struct msc_a *msc_a);
 bool msc_a_is_establishing_auth_ciph(const struct msc_a *msc_a);
 
+int msc_a_ensure_cn_local_rtp(struct msc_a *msc_a, struct gsm_trans *cc_trans);
 int msc_a_try_call_assignment(struct gsm_trans *cc_trans);
 
 const char *msc_a_cm_service_type_to_use(enum osmo_cm_service_type cm_service_type);
diff --git a/src/libmsc/gsm_04_08_cc.c b/src/libmsc/gsm_04_08_cc.c
index 8eb76b3f4..4bd6bfa9c 100644
--- a/src/libmsc/gsm_04_08_cc.c
+++ b/src/libmsc/gsm_04_08_cc.c
@@ -515,10 +515,6 @@ static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
 	unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
 	struct tlv_parsed tp;
 	struct gsm_mncc setup;
-	struct osmo_sockaddr_str *rtp_cn_local;
-	struct sdp_msg *sdp;
-	struct msc_a *msc_a = trans->msc_a;
-	int rc;
 
 	gsm48_start_guard_timer(trans);
 
@@ -543,6 +539,8 @@ static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
 		msgb_free(gcr_msg);
 	}
 
+	OSMO_ASSERT(trans->msc_a);
+
 	tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
 	/* emergency setup is identified by msg_type */
 	if (msg_type == GSM48_MT_CC_EMERG_SETUP) {
@@ -612,8 +610,6 @@ static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
 			     TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1);
 	}
 
-	new_cc_state(trans, GSM_CSTATE_INITIATED);
-
 	/* MO call leg starting, gather all codec information so far known: */
 	codec_filter_init(&trans->cc.codecs);
 	codec_filter_set_ran(&trans->cc.codecs, trans->msc_a->c.ran->type);
@@ -628,15 +624,53 @@ static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
 
 	rate_ctr_inc(rate_ctr_group_get_ctr(trans->net->msc_ctrs, MSC_CTR_CALL_MO_SETUP));
 
+	new_cc_state(trans, GSM_CSTATE_INITIATED);
+
+	/* To complete the MNCC_SETUP_IND, we need to provide an RTP address and port. First instruct the MGW to create
+	 * a CN-side RTP conn, and continue with MNCC_SETUP_IND once that is done. Leave trans.cc in GSM_CSTATE_NULL and
+	 * note down the msg_type to indicate that we indeed composed an MNCC_SETUP_IND for later. */
+	setup.msg_type = MNCC_SETUP_IND;
+	trans->cc.msg = setup;
+	return msc_a_try_call_assignment(trans);
+	/* continue in gsm48_cc_rx_setup_cn_local_rtp_port_known() */
+}
+
+/* Callback for MNCC_SETUP_IND waiting for the core network RTP port to be established by the MGW (via msc_a) */
+void gsm48_cc_rx_setup_cn_local_rtp_port_known(struct gsm_trans *trans)
+{
+	struct msc_a *msc_a = trans->msc_a;
+	struct gsm_mncc setup = trans->cc.msg;
+	struct osmo_sockaddr_str *rtp_cn_local;
+	struct sdp_msg *sdp;
+	int rc;
+
+	if (trans->cc.state != GSM_CSTATE_INITIATED
+	    || setup.msg_type != MNCC_SETUP_IND) {
+		LOG_TRANS(trans, LOGL_ERROR,
+			  "Unexpected CC state. Expected GSM_CSTATE_NULL and a buffered MNCC_SETUP_IND message,"
+			  " found CC state %d and msg_type %s\n",
+			  trans->cc.state, get_mncc_name(setup.msg_type));
+		trans->callref = 0;
+		trans_free(trans);
+		return;
+	}
+
+	if (!msc_a) {
+		LOG_TRANS(trans, LOGL_ERROR, "No connection for CC trans\n");
+		trans->callref = 0;
+		trans_free(trans);
+		return;
+	}
+
+	/* 'setup' above has taken the value of trans->cc.msg, we can now clear that. */
+	trans->cc.msg = (struct gsm_mncc){};
+
 	/* Insert the CN side RTP port now available into SDP and compose SDP string */
 	rtp_cn_local = call_leg_local_ip(msc_a->cc.call_leg, RTP_TO_CN);
 	if (!osmo_sockaddr_str_is_nonzero(rtp_cn_local)) {
 		LOG_TRANS(trans, LOGL_ERROR, "Cannot compose SDP for MNCC_SETUP_IND: no RTP set up for the CN side\n");
-		/* FIXME: re-add below two lines as soon as CN CRCX is done first
-		 * (see Change-Id Ie433db1ba0c46d4b97538a969233c155cefac21c).
-		 * keeping it non-fatal for the moment, for tests to continue succeeding. */
-		//trans_free(trans);
-		//return -EINVAL;
+		trans_free(trans);
+		return;
 	}
 
 	codec_filter_set_local_rtp(&trans->cc.codecs, rtp_cn_local);
@@ -646,16 +680,11 @@ static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
 	if (rc >= sizeof(setup.sdp)) {
 		LOG_TRANS(trans, LOGL_ERROR, "MNCC_SETUP_IND: SDP too long (%d > %zu bytes)\n", rc, sizeof(setup.sdp));
 		trans_free(trans);
-		return -EINVAL;
+		return;
 	}
 
 	/* indicate setup to MNCC */
 	mncc_recvmsg(trans->net, trans, MNCC_SETUP_IND, &setup);
-
-	/* MNCC code will modify the channel asynchronously, we should
-	 * ipaccess-bind only after the modification has been made to the
-	 * lchan->tch_mode */
-	return 0;
 }
 
 static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
@@ -698,8 +727,6 @@ static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
 
 	gh->msg_type = GSM48_MT_CC_SETUP;
 
-	gsm48_start_cc_timer(trans, 0x303, GSM48_T303);
-
 	/* MT call leg is starting. Gather all codecs information so far known.
 	 * (Usually) paging has succeeded, and now we're processing the MNCC Setup from the remote MO call leg.
 	 * Initialize the codecs filter with this side's BSS' codec list, received at Complete Layer 3.
@@ -788,6 +815,8 @@ static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
 
 	rate_ctr_inc(rate_ctr_group_get_ctr(trans->net->msc_ctrs, MSC_CTR_CALL_MT_SETUP));
 
+	gsm48_start_cc_timer(trans, 0x303, GSM48_T303);
+
 	return trans_tx_gsm48(trans, msg);
 }
 
@@ -846,8 +875,6 @@ static int gsm48_cc_rx_call_conf(struct gsm_trans *trans, struct msgb *msg)
 	/* IMSI of called subscriber */
 	OSMO_STRLCPY_ARRAY(call_conf.imsi, trans->vsub->imsi);
 
-	new_cc_state(trans, GSM_CSTATE_MO_TERM_CALL_CONF);
-
 	/* Assign call (if not done yet) */
 	rc = msc_a_try_call_assignment(trans);
 
@@ -856,8 +883,45 @@ static int gsm48_cc_rx_call_conf(struct gsm_trans *trans, struct msgb *msg)
 	if (rc)
 		return rc;
 
-	return mncc_recvmsg(trans->net, trans, MNCC_CALL_CONF_IND,
-			    &call_conf);
+	/* Directly ack with MNCC_CALL_CONF_IND, not yet containing SDP or RTP IP:port information. */
+	new_cc_state(trans, GSM_CSTATE_MO_TERM_CALL_CONF);
+	return mncc_recvmsg(trans->net, trans, MNCC_CALL_CONF_IND, &call_conf);
+}
+
+static int mncc_recv_rtp(struct gsm_network *net, struct gsm_trans *trans, uint32_t callref,
+			 int cmd, struct osmo_sockaddr_str *rtp_addr, uint32_t payload_type,
+			 uint32_t payload_msg_type, const struct sdp_msg *sdp);
+
+int gsm48_cc_mt_rtp_port_and_codec_known(struct gsm_trans *trans)
+{
+	struct msc_a *msc_a = trans->msc_a;
+	struct osmo_sockaddr_str *rtp_cn_local;
+	struct gsm_mncc_rtp;
+
+	if (!msc_a) {
+		LOG_TRANS(trans, LOGL_ERROR, "No connection for CC trans\n");
+		trans->callref = 0;
+		trans_free(trans);
+		return -EINVAL;
+	}
+
+	/* Insert the CN side RTP port now available into SDP */
+	rtp_cn_local = call_leg_local_ip(msc_a->cc.call_leg, RTP_TO_CN);
+	if (!rtp_cn_local) {
+		LOG_TRANS(trans, LOGL_ERROR, "Cannot compose SDP for MNCC_RTP_CREATE: no RTP set up for the CN side\n");
+		trans_free(trans);
+		return -EINVAL;
+	}
+	codec_filter_set_local_rtp(&trans->cc.codecs, rtp_cn_local);
+
+	codec_filter_run(&trans->cc.codecs);
+	LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
+
+	if (!sdp_audio_codec_is_set(&trans->cc.codecs.assignment))
+		return 0;
+
+	return mncc_recv_rtp(msc_a_net(msc_a), trans, trans->callref, MNCC_RTP_CREATE, rtp_cn_local, 0, 0,
+			     &trans->cc.codecs.result);
 }
 
 static int gsm48_cc_tx_call_proc_and_assign(struct gsm_trans *trans, void *arg)
@@ -1839,6 +1903,61 @@ static int tch_rtp_create(struct gsm_network *net, uint32_t callref)
 	return msc_a_try_call_assignment(trans);
 }
 
+int cc_cn_local_rtp_port_known(struct gsm_trans *cc_trans)
+{
+	switch(cc_trans->cc.state) {
+	case GSM_CSTATE_INITIATED:
+		if (cc_trans->cc.msg.msg_type != MNCC_SETUP_IND) {
+			LOG_TRANS(cc_trans, LOGL_ERROR, "Assuming MO call, expected MNCC_SETUP_IND to be prepared\n");
+			return -EINVAL;
+		}
+		/* This is the MO call leg, waiting for a CN RTP be able to send initial MNCC_SETUP_IND. */
+		gsm48_cc_rx_setup_cn_local_rtp_port_known(cc_trans);
+		return 0;
+
+	case GSM_CSTATE_MO_TERM_CALL_CONF:
+		/* This is the MT call leg, waiting for a CN RTP to be able to send MNCC_CALL_CONF_IND. */
+		return gsm48_cc_mt_rtp_port_and_codec_known(cc_trans);
+
+	default:
+		LOG_TRANS(cc_trans, LOGL_ERROR, "CN RTP address available, but in unexpected state %d\n",
+			  cc_trans->cc.state);
+		return -EINVAL;
+	}
+}
+
+int cc_assignment_done(struct gsm_trans *trans)
+{
+	struct msc_a *msc_a = trans->msc_a;
+
+	switch (trans->cc.state) {
+	case GSM_CSTATE_INITIATED:
+	case GSM_CSTATE_MO_CALL_PROC:
+		/* MO call */
+		break;
+
+	case GSM_CSTATE_CALL_RECEIVED:
+	case GSM_CSTATE_MO_TERM_CALL_CONF:
+		/* MT call */
+		break;
+
+	case GSM_CSTATE_ACTIVE:
+		/* already active. MNCC finished before Abis completed the Assignment. */
+		break;
+
+	default:
+		LOG_TRANS(trans, LOGL_ERROR, "Assignment done in unexpected CC state: %d\n", trans->cc.state);
+		return -EINVAL;
+	}
+
+	if (!call_leg_local_ip(msc_a->cc.call_leg, RTP_TO_CN)) {
+		LOG_TRANS(trans, LOGL_DEBUG,
+			  "Assignment complete, but still waiting for the CRCX OK on the CN side RTP\n");
+		return 0;
+	}
+	return gsm48_tch_rtp_create(trans);
+}
+
 /* Trigger TCH_RTP_CREATE acknowledgement */
 int gsm48_tch_rtp_create(struct gsm_trans *trans)
 {
diff --git a/src/libmsc/msc_a.c b/src/libmsc/msc_a.c
index af66e3f8a..7c1af43c1 100644
--- a/src/libmsc/msc_a.c
+++ b/src/libmsc/msc_a.c
@@ -564,12 +564,87 @@ static void msc_a_fsm_authenticated(struct osmo_fsm_inst *fi, uint32_t event, vo
 	}
 }
 
+static struct call_leg *msc_a_ensure_call_leg(struct msc_a *msc_a, struct gsm_trans *for_cc_trans)
+{
+	struct call_leg *cl = msc_a->cc.call_leg;
+	struct gsm_network *net = msc_a_net(msc_a);
+
+	/* Ensure that events about RTP endpoints coming from the msc_a->cc.call_leg know which gsm_trans to abort on
+	 * error */
+	if (!msc_a->cc.active_trans)
+		msc_a->cc.active_trans = for_cc_trans;
+	if (msc_a->cc.active_trans != for_cc_trans) {
+		LOG_TRANS(for_cc_trans, LOGL_ERROR,
+			  "Cannot create call leg, another trans is already active for this conn\n");
+		return NULL;
+	}
+
+	if (!cl) {
+		cl = msc_a->cc.call_leg = call_leg_alloc(msc_a->c.fi,
+							 MSC_EV_CALL_LEG_TERM,
+							 MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE,
+							 MSC_EV_CALL_LEG_RTP_COMPLETE);
+		OSMO_ASSERT(cl);
+
+		/* HACK: We put the connection in loopback mode at the beginnig to
+		 * trick the hNodeB into doing the IuUP negotiation with itself.
+		 * This is a hack we need because osmo-mgw does not support IuUP yet, see OS#2459. */
+		if (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU)
+			cl->crcx_conn_mode[RTP_TO_RAN] = MGCP_CONN_LOOPBACK;
+
+		if (net->use_osmux != OSMUX_USAGE_OFF) {
+			struct msc_i *msc_i = msc_a_msc_i(msc_a);
+			if (msc_i->c.remote_to) {
+				/* TODO: investigate what to do in this case */
+				LOG_MSC_A(msc_a, LOGL_ERROR, "Osmux not yet supported for inter-MSC");
+			} else {
+				cl->ran_peer_supports_osmux = msc_i->ran_conn->ran_peer->remote_supports_osmux;
+			}
+		}
+
+	}
+	return cl;
+}
+
+int msc_a_ensure_cn_local_rtp(struct msc_a *msc_a, struct gsm_trans *cc_trans)
+{
+	struct call_leg *cl;
+	struct rtp_stream *rtp_to_ran;
+
+	cl = msc_a_ensure_call_leg(msc_a, cc_trans);
+	if (!cl)
+		return -EINVAL;
+	rtp_to_ran = cl->rtp[RTP_TO_RAN];
+
+	if (call_leg_local_ip(cl, RTP_TO_CN)) {
+		/* Already has an RTP address and port towards the CN, continue right away. */
+		return osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, cl->rtp[RTP_TO_CN]);
+	}
+
+	/* No CN RTP address available yet, ask the MGW to create one.
+	 * Set a codec to be used: if Assignment on the RAN side is already done, take the same codec as the RTP_TO_RAN.
+	 * If no RAN side RTP is established, try to guess a preliminary codec from SDP -- before Assignment, picking a
+	 * codec from the SDP is more politeness/avoiding confusion than necessity. The actual codec to be used would be
+	 * determined later. If no codec could be determined, pass none for the time being. */
+	return call_leg_ensure_ci(cl, RTP_TO_CN, cc_trans->callref, cc_trans,
+				  rtp_to_ran->codecs_known ? &rtp_to_ran->codecs : NULL, NULL);
+}
+
+static void msc_a_call_leg_cn_local_addr_available(struct msc_a *msc_a, struct gsm_trans *cc_trans)
+{
+	cc_cn_local_rtp_port_known(cc_trans);
+}
+
+
 /* The MGW has given us a local IP address for the RAN side. Ready to start the Assignment of a voice channel. */
 static void msc_a_call_leg_ran_local_addr_available(struct msc_a *msc_a)
 {
 	struct ran_msg msg;
 	struct gsm_trans *cc_trans = msc_a->cc.active_trans;
-	struct gsm0808_channel_type channel_type;
+	struct gsm0808_channel_type channel_type = {
+		.ch_indctr = GSM0808_CHAN_SPEECH,
+		.ch_rate_type = GSM0808_SPEECH_FULL_PREF,
+	};
 
 	if (!cc_trans) {
 		LOG_MSC_A(msc_a, LOGL_ERROR, "No CC transaction active\n");
@@ -579,9 +654,22 @@ static void msc_a_call_leg_ran_local_addr_available(struct msc_a *msc_a)
 
 	/* Once a CI is known, we could also CRCX the CN side of the MGW endpoint, but it makes sense to wait for the
 	 * codec to be determined by the Assignment Complete message, first. */
+	codec_filter_run(&cc_trans->cc.codecs);
+	LOG_TRANS(cc_trans, LOGL_DEBUG, "Sending Assignment Command with codecs: %s\n",
+		  codec_filter_to_str(&cc_trans->cc.codecs));
+
+	if (!cc_trans->cc.codecs.result.audio_codecs.count) {
+		LOG_TRANS(cc_trans, LOGL_ERROR, "Assignment not possible, no matching codec: %s\n",
+			  codec_filter_to_str(&cc_trans->cc.codecs));
+		call_leg_release(msc_a->cc.call_leg);
+		return;
+	}
 
-	if (mncc_bearer_cap_to_channel_type(&channel_type, &cc_trans->bearer_cap)) {
-		LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot compose Channel Type from bearer capabilities\n");
+	/* Compose 48.008 Channel Type from the current set of codecs determined from both local and remote codec
+	 * capabilities. */
+	if (sdp_audio_codecs_to_gsm0808_channel_type(&channel_type, &cc_trans->cc.codecs.result.audio_codecs)) {
+		LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot compose Channel Type (Permitted Speech) from codecs: %s\n",
+			  codec_filter_to_str(&cc_trans->cc.codecs));
 		trans_free(cc_trans);
 		return;
 	}
@@ -606,15 +694,6 @@ static void msc_a_call_leg_ran_local_addr_available(struct msc_a *msc_a)
 	}
 }
 
-static void msc_a_call_leg_cn_local_addr_available(struct msc_a *msc_a, struct gsm_trans *cc_trans)
-{
-	if (gsm48_tch_rtp_create(cc_trans)) {
-		LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot inform MNCC of RTP address\n");
-		trans_free(cc_trans);
-		return;
-	}
-}
-
 static struct gsm_trans *find_waiting_call(struct msc_a *msc_a)
 {
 	struct gsm_trans *trans;
@@ -1327,7 +1406,6 @@ static void msc_a_up_call_assignment_complete(struct msc_a *msc_a, const struct
 	struct rtp_stream *rtps_to_ran = msc_a->cc.call_leg ? msc_a->cc.call_leg->rtp[RTP_TO_RAN] : NULL;
 	const enum mgcp_codecs *codec_if_known = ac->assignment_complete.codec_present ?
 							&ac->assignment_complete.codec : NULL;
-	struct sdp_audio_codecs *codecs;
 	const struct codec_mapping *m;
 
 	if (!rtps_to_ran) {
@@ -1357,29 +1435,23 @@ static void msc_a_up_call_assignment_complete(struct msc_a *msc_a, const struct
 
 		/* Update RAN-side endpoint CI: */
 		rtp_stream_set_one_codec(rtps_to_ran, &m->sdp);
+
+		/* Update codecs filter with the codec chosen by Assignment */
+		cc_trans->cc.codecs.assignment = m->sdp;
 	}
 	rtp_stream_set_remote_addr(rtps_to_ran, &ac->assignment_complete.remote_rtp);
 
 	if (rtps_to_ran->use_osmux)
 		rtp_stream_set_remote_osmux_cid(rtps_to_ran,
 						ac->assignment_complete.osmux_cid);
-
 	rtp_stream_commit(rtps_to_ran);
 
 	/* Remember the Codec List (BSS Supported) */
 	if (ac->assignment_complete.codec_list_bss_supported)
 		codec_filter_set_bss(&cc_trans->cc.codecs, ac->assignment_complete.codec_list_bss_supported);
 
-	/* Setup CN side endpoint CI:
-	 * Now that
-	 * - the first CI has been created and a definitive endpoint name is assigned to the call_leg's MGW
-	 *   endpoint,
-	 * - the Assignment has chosen a speech codec
-	 * go on to create the CN side RTP stream's CI. */
-	codecs = cc_trans->cc.codecs.result.audio_codecs.count ? &cc_trans->cc.codecs.result.audio_codecs : NULL;
-	if (call_leg_ensure_ci(msc_a->cc.call_leg, RTP_TO_CN, cc_trans->callref, cc_trans,
-			       codecs, NULL)) {
-		LOG_MSC_A_CAT(msc_a, DCC, LOGL_ERROR, "Error creating MGW CI towards CN\n");
+	if (cc_assignment_done(cc_trans)) {
+		/* If an error occured, it was logged in cc_assignment_done() */
 		call_leg_release(msc_a->cc.call_leg);
 		return;
 	}
@@ -1767,55 +1839,50 @@ int msc_tx_common_id(struct msc_a *msc_a, enum msc_role to_role)
 
 static int msc_a_start_assignment(struct msc_a *msc_a, struct gsm_trans *cc_trans)
 {
-	struct call_leg *cl = msc_a->cc.call_leg;
-	struct msc_i *msc_i = msc_a_msc_i(msc_a);
-	struct gsm_network *net = msc_a_net(msc_a);
+	struct call_leg *cl;
+	bool cn_rtp_available;
+	bool ran_rtp_available;
 	struct sdp_audio_codecs *codecs;
-	struct sdp_audio_codecs _codecs;
 
 	OSMO_ASSERT(!msc_a->cc.active_trans);
 	msc_a->cc.active_trans = cc_trans;
 
 	OSMO_ASSERT(cc_trans && cc_trans->type == TRANS_CC);
+	cl = msc_a_ensure_call_leg(msc_a, cc_trans);
+	if (!cl)
+		return -EINVAL;
 
-	if (!cl) {
-		cl = msc_a->cc.call_leg = call_leg_alloc(msc_a->c.fi,
-							 MSC_EV_CALL_LEG_TERM,
-							 MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE,
-							 MSC_EV_CALL_LEG_RTP_COMPLETE);
-		OSMO_ASSERT(cl);
+	/* See if we can set a preliminary codec. If not, pass none for the time being. */
+	codec_filter_run(&cc_trans->cc.codecs);
+	codecs = cc_trans->cc.codecs.result.audio_codecs.count ? &cc_trans->cc.codecs.result.audio_codecs : NULL;
 
-		/* HACK: We put the connection in loopback mode at the beginning to
-		 * trick the hNodeB into doing the IuUP negotiation with itself.
-		 * This is a hack we need because osmo-mgw does not support IuUP yet, see OS#2459. */
-		if (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU)
-			cl->crcx_conn_mode[RTP_TO_RAN] = MGCP_CONN_LOOPBACK;
-	}
+	cn_rtp_available = call_leg_local_ip(cl, RTP_TO_CN);
+	ran_rtp_available = call_leg_local_ip(cl, RTP_TO_RAN);
 
-	if (net->use_osmux != OSMUX_USAGE_OFF) {
-		msc_i = msc_a_msc_i(msc_a);
-		if (msc_i->c.remote_to) {
-			/* TODO: investigate what to do in this case */
-			LOG_MSC_A(msc_a, LOGL_ERROR, "Osmux not yet supported for inter-MSC");
-		} else {
-			cl->ran_peer_supports_osmux = msc_i->ran_conn->ran_peer->remote_supports_osmux;
+	/* Set up RTP ports for both RAN and CN side. Even though we ask for both at the same time, the
+	 * osmo_mgcpc_ep_fsm automagically waits for the first CRCX to complete before firing the second CRCX. The one
+	 * issued first here will also be the first CRCX sent to the MGW. Usually both still need to be set up. */
+	if (!cn_rtp_available)
+		call_leg_ensure_ci(cl, RTP_TO_CN, cc_trans->callref, cc_trans, codecs, NULL);
+	if (!ran_rtp_available) {
+		struct sdp_audio_codecs iufp;
+		if (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU) {
+			/* On Iu, the hNodeB facing side of RTP talks IuUP. Hard code the RAN facing codec to "IUFP". */
+			iufp = (struct sdp_audio_codecs){0};
+			sdp_audio_codecs_add_mgcp_codec(&iufp, CODEC_IUFP);
+			codecs = &iufp;
 		}
+		call_leg_ensure_ci(cl, RTP_TO_RAN, cc_trans->callref, cc_trans, codecs, NULL);
 	}
 
-	/* This will lead to either MSC_EV_CALL_LEG_LOCAL_ADDR_AVAILABLE or MSC_EV_CALL_LEG_TERM.
-	 * If the local address is already known, then immediately trigger. */
-	if (call_leg_local_ip(cl, RTP_TO_RAN))
+	/* Should these already be set up, immediately continue by retriggering the events signalling that the RTP
+	 * ports are available. The ordering is: first CN, then RAN. */
+	if (cn_rtp_available && ran_rtp_available)
 		return osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, cl->rtp[RTP_TO_RAN]);
-
-	if (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU) {
-		/* The hNodeB facing side of RTP talks IuUP. Hard code the RAN facing codec to "IUFP". */
-		_codecs = (struct sdp_audio_codecs){0};
-		sdp_audio_codecs_add_mgcp_codec(&_codecs, CODEC_IUFP);
-		codecs = &_codecs;
-	} else {
-		codecs = cc_trans->cc.codecs.result.audio_codecs.count ? &cc_trans->cc.codecs.result.audio_codecs : NULL;
-	}
-	return call_leg_ensure_ci(msc_a->cc.call_leg, RTP_TO_RAN, cc_trans->callref, cc_trans, codecs, NULL);
+	else if (cn_rtp_available)
+		return osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, cl->rtp[RTP_TO_CN]);
+	/* Otherwise wait for MGCP response and continue from there.  */
+	return 0;
 }
 
 int msc_a_try_call_assignment(struct gsm_trans *cc_trans)
diff --git a/tests/msc_vlr/msc_vlr_test_call.c b/tests/msc_vlr/msc_vlr_test_call.c
index 8dba37918..361d0fb47 100644
--- a/tests/msc_vlr/msc_vlr_test_call.c
+++ b/tests/msc_vlr/msc_vlr_test_call.c
@@ -202,8 +202,9 @@ static void test_call_mo()
 
 	BTW("a call is initiated");
 
-	btw("SETUP gets forwarded to MNCC");
-	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_IND);
+	btw("CC SETUP causes CRCX towards CN");
+	expect_crcx(RTP_TO_CN);
+	expect_crcx(RTP_TO_RAN);
 	ms_sends_msg("0385" /* CC, seq = 2 -> 0x80 | CC Setup = 0x5 */
 		     "0406600402000581" /* Bearer Capability */
 		     "5e038121f3" /* Called Number BCD */
@@ -212,27 +213,27 @@ static void test_call_mo()
 		       "04026000" /* UMTS: AMR 2 | AMR */
 		       "00021f00" /* GSM: HR AMR | FR AMR | GSM EFR | GSM HR | GSM FR */
 		    );
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
+
+	btw("As soon as the MGW port towards CN is created, MNCC_SETUP_IND is triggered");
+	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_IND);
+	crcx_ok(RTP_TO_CN);
 	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 	mncc.callref = cc_to_mncc_tx_got_callref;
 
 	btw("MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN");
-	expect_crcx(RTP_TO_RAN);
 	mncc_sends_to_cc(MNCC_RTP_CREATE, &mncc);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
 
 	btw("MGW acknowledges the CRCX, triggering Assignment");
 	expect_iu_rab_assignment();
 	crcx_ok(RTP_TO_RAN);
 	OSMO_ASSERT(iu_rab_assignment_sent);
 
-	btw("Assignment succeeds, triggering CRCX to CN");
-	expect_crcx(RTP_TO_CN);
-	ms_sends_assignment_complete(CODEC_AMR_8000_1);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
-
-	btw("CN RTP address is available, trigger MNCC_RTP_CREATE");
+	btw("Assignment succeeds, triggering MNCC_RTP_CREATE ack to MNCC");
 	cc_to_mncc_expect_tx("", MNCC_RTP_CREATE);
-	crcx_ok(RTP_TO_CN);
+	ms_sends_assignment_complete(CODEC_AMR_8000_1);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
 	btw("MNCC says that's fine");
 	dtap_expect_tx("8302" /* CC: Call Proceeding */);
@@ -285,6 +286,25 @@ static void test_call_mt()
 	struct gsm_mncc mncc = {
 		.imsi = IMSI,
 		.callref = 0x423,
+		.fields = MNCC_F_BEARER_CAP,
+		.bearer_cap = {
+			.speech_ver = {
+				GSM48_BCAP_SV_AMR_F,
+				GSM48_BCAP_SV_EFR,
+				GSM48_BCAP_SV_FR,
+				GSM48_BCAP_SV_AMR_H,
+				GSM48_BCAP_SV_HR,
+				-1 },
+		},
+		.sdp =  "v=0\r\n"
+			"o=OsmoMSC 0 0 IN IP4 10.23.23.1\r\n"
+			"s=GSM Call\r\n"
+			"c=IN IP4 10.23.23.1\r\n"
+			"t=0 0\r\n"
+			"m=audio 23 RTP/AVP 112\r\n"
+			"a=rtpmap:112 AMR/8000\r\n"
+			"a=fmtp:112 octet-align=1\r\n"
+			"a=ptime:20\r\n",
 	};
 
 	comment_start();
@@ -298,6 +318,7 @@ static void test_call_mt()
 	paging_expect_imsi(IMSI);
 	paging_sent = false;
 	mncc_sends_to_cc(MNCC_SETUP_REQ, &mncc);
+	mncc.sdp[0] = '\0';
 
 	VERBOSE_ASSERT(paging_sent, == true, "%d");
 
@@ -316,22 +337,21 @@ static void test_call_mt()
 	VERBOSE_ASSERT(security_mode_ctrl_sent, == true, "%d");
 
 	btw("MS sends SecurityModeControl acceptance, VLR accepts, sends CC Setup");
-	dtap_expect_tx("0305" /* CC: Setup */ "04 07 60 04 05 0b 06 08 87" /* Bearer Cap */);
+	dtap_expect_tx("0305" /* CC: Setup */ "04 04 60 04 05 8b" /* Bearer Cap */);
 	ms_sends_security_mode_complete(1);
 
 	btw("MS confirms call, we create a RAN-side RTP and forward MNCC_CALL_CONF_IND");
+	expect_crcx(RTP_TO_CN);
 	expect_crcx(RTP_TO_RAN);
 	cc_to_mncc_expect_tx(IMSI, MNCC_CALL_CONF_IND);
 	ms_sends_msg("8348" /* CC: Call Confirmed */
 		     "0406600402000581" /* Bearer Capability */
 		     "15020100" /* Call Control Capabilities */
 		     "40080402600400021f00" /* Supported Codec List */);
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
 	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
 	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
-	btw("MNCC sends MNCC_RTP_CREATE");
-	mncc_sends_to_cc(MNCC_RTP_CREATE, &mncc);
-
 	btw("MGW acknowledges the CRCX to RAN, triggering Assignment");
 	expect_iu_rab_assignment();
 	crcx_ok(RTP_TO_RAN);
@@ -340,21 +360,26 @@ static void test_call_mt()
 	btw("Assignment completes, triggering CRCX to CN");
 	expect_crcx(RTP_TO_CN);
 	ms_sends_assignment_complete(CODEC_AMR_8000_1);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
 
-	btw("When the CN side RTP address is known, send MNCC_RTP_CREATE");
+	btw("MNCC sends MNCC_RTP_CREATE, which first waits for the CN side RTP");
+	mncc_sends_to_cc(MNCC_RTP_CREATE, &mncc);
+
+	btw("When the CN side RTP address is known, ack MNCC_RTP_CREATE with full SDP");
 	cc_to_mncc_expect_tx("", MNCC_RTP_CREATE);
 	crcx_ok(RTP_TO_CN);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
 	fake_time_passes(1, 23);
 
 	cc_to_mncc_expect_tx("", MNCC_ALERT_IND);
 	ms_sends_msg("8381" /* CC: Alerting */);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
 	fake_time_passes(1, 23);
 
 	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_CNF);
 	ms_sends_msg("83c7" /* CC: Connect */);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
 	dtap_expect_tx("030f" /* CC: Connect Acknowledge */);
 	mncc_sends_to_cc(MNCC_SETUP_COMPL_REQ, &mncc);
@@ -388,6 +413,19 @@ static void test_call_mt2()
 	struct gsm_mncc mncc = {
 		.imsi = IMSI,
 		.callref = 0x423,
+		.fields = MNCC_F_BEARER_CAP,
+		.bearer_cap = {
+			.speech_ver = { GSM48_BCAP_SV_FR, -1, },
+		},
+		.sdp =  "v=0\r\n"
+			"o=OsmoMSC 0 0 IN IP4 10.23.23.1\r\n"
+			"s=GSM Call\r\n"
+			"c=IN IP4 10.23.23.1\r\n"
+			"t=0 0\r\n"
+			"m=audio 23 RTP/AVP 112\r\n"
+			"a=rtpmap:112 AMR/8000\r\n"
+			"a=fmtp:112 octet-align=1\r\n"
+			"a=ptime:20\r\n",
 	};
 
 	comment_start();
@@ -419,20 +457,22 @@ static void test_call_mt2()
 	VERBOSE_ASSERT(security_mode_ctrl_sent, == true, "%d");
 
 	btw("MS sends SecurityModeControl acceptance, VLR accepts, sends CC Setup");
-	dtap_expect_tx("0305" /* CC: Setup */ "04 07 60 04 05 0b 06 08 87" /* Bearer Cap */);
+	dtap_expect_tx("0305" /* CC: Setup */ "04 04 60 04 05 8b" /* Bearer Cap */);
 	ms_sends_security_mode_complete(1);
 
 	btw("MS confirms call, we create a RAN-side RTP and forward MNCC_CALL_CONF_IND");
+	expect_crcx(RTP_TO_CN);
 	expect_crcx(RTP_TO_RAN);
 	cc_to_mncc_expect_tx(IMSI, MNCC_CALL_CONF_IND);
 	ms_sends_msg("8348" /* CC: Call Confirmed */
 		     "0406600402000581" /* Bearer Capability */
 		     "15020100" /* Call Control Capabilities */
 		     "40080402600400021f00" /* Supported Codec List */);
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
 	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
 	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
-	btw("MNCC sends MNCC_RTP_CREATE");
+	btw("MNCC sends MNCC_RTP_CREATE, which first waits for the CN side RTP");
 	mncc_sends_to_cc(MNCC_RTP_CREATE, &mncc);
 
 	btw("MGW acknowledges the CRCX to RAN, triggering Assignment");
@@ -441,13 +481,13 @@ static void test_call_mt2()
 	OSMO_ASSERT(iu_rab_assignment_sent);
 
 	btw("Assignment completes, triggering CRCX to CN");
-	expect_crcx(RTP_TO_CN);
 	ms_sends_assignment_complete(CODEC_AMR_8000_1);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
 
-	btw("When the CN side RTP address is known, send MNCC_RTP_CREATE");
+	btw("When the CN side RTP address is known, ack MNCC_RTP_CREATE with full SDP");
 	cc_to_mncc_expect_tx("", MNCC_RTP_CREATE);
 	crcx_ok(RTP_TO_CN);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
+
 	fake_time_passes(1, 23);
 
 	cc_to_mncc_expect_tx("", MNCC_ALERT_IND);
@@ -514,8 +554,9 @@ static void test_call_mo_to_unknown()
 
 	BTW("a call is initiated");
 
-	btw("SETUP gets forwarded to MNCC");
-	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_IND);
+	btw("CC SETUP causes CRCX towards CN");
+	expect_crcx(RTP_TO_CN);
+	expect_crcx(RTP_TO_RAN);
 	ms_sends_msg("0385" /* CC, seq = 2 -> 0x80 | CC Setup = 0x5 */
 		     "0406600402000581" /* Bearer Capability */
 		     "5e038121f3" /* Called Number BCD */
@@ -524,27 +565,27 @@ static void test_call_mo_to_unknown()
 		       "04026000" /* UMTS: AMR 2 | AMR */
 		       "00021f00" /* GSM: HR AMR | FR AMR | GSM EFR | GSM HR | GSM FR */
 		    );
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
+
+	btw("As soon as the MGW port towards CN is created, MNCC_SETUP_IND is triggered");
+	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_IND);
+	crcx_ok(RTP_TO_CN);
 	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 	mncc.callref = cc_to_mncc_tx_got_callref;
 
 	btw("MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN");
-	expect_crcx(RTP_TO_RAN);
 	mncc_sends_to_cc(MNCC_RTP_CREATE, &mncc);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
 
 	btw("MGW acknowledges the CRCX, triggering Assignment");
 	expect_iu_rab_assignment();
 	crcx_ok(RTP_TO_RAN);
 	OSMO_ASSERT(iu_rab_assignment_sent);
 
-	btw("Assignment succeeds, triggering CRCX to CN");
-	expect_crcx(RTP_TO_CN);
-	ms_sends_assignment_complete(CODEC_AMR_8000_1);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
-
-	btw("CN RTP address is available, trigger MNCC_RTP_CREATE");
+	btw("Assignment succeeds, triggering MNCC_RTP_CREATE ack to MNCC");
 	cc_to_mncc_expect_tx("", MNCC_RTP_CREATE);
-	crcx_ok(RTP_TO_CN);
+	ms_sends_assignment_complete(CODEC_AMR_8000_1);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
 	btw("MNCC says that's fine");
 	dtap_expect_tx("8302" /* CC: Call Proceeding */);
@@ -561,7 +602,6 @@ static void test_call_mo_to_unknown()
 	expect_iu_release();
 	cc_to_mncc_expect_tx("", MNCC_REL_CNF);
 	ms_sends_msg("036a" /* CC: Release Complete */);
-	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 	OSMO_ASSERT(iu_release_sent);
 	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
@@ -610,8 +650,9 @@ static void test_call_mo_to_unknown_timeout()
 
 	BTW("a call is initiated");
 
-	btw("SETUP gets forwarded to MNCC");
-	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_IND);
+	btw("CC SETUP causes CRCX towards CN");
+	expect_crcx(RTP_TO_CN);
+	expect_crcx(RTP_TO_RAN);
 	ms_sends_msg("0385" /* CC, seq = 2 -> 0x80 | CC Setup = 0x5 */
 		     "0406600402000581" /* Bearer Capability */
 		     "5e038121f3" /* Called Number BCD */
@@ -620,27 +661,27 @@ static void test_call_mo_to_unknown_timeout()
 		       "04026000" /* UMTS: AMR 2 | AMR */
 		       "00021f00" /* GSM: HR AMR | FR AMR | GSM EFR | GSM HR | GSM FR */
 		    );
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
+	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
+
+	btw("As soon as the MGW port towards CN is created, MNCC_SETUP_IND is triggered");
+	cc_to_mncc_expect_tx(IMSI, MNCC_SETUP_IND);
+	crcx_ok(RTP_TO_CN);
 	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 	mncc.callref = cc_to_mncc_tx_got_callref;
 
 	btw("MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN");
-	expect_crcx(RTP_TO_RAN);
 	mncc_sends_to_cc(MNCC_RTP_CREATE, &mncc);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_RAN));
 
 	btw("MGW acknowledges the CRCX, triggering Assignment");
 	expect_iu_rab_assignment();
 	crcx_ok(RTP_TO_RAN);
 	OSMO_ASSERT(iu_rab_assignment_sent);
 
-	btw("Assignment succeeds, triggering CRCX to CN");
-	expect_crcx(RTP_TO_CN);
-	ms_sends_assignment_complete(CODEC_AMR_8000_1);
-	OSMO_ASSERT(crcx_scheduled(RTP_TO_CN));
-
-	btw("CN RTP address is available, trigger MNCC_RTP_CREATE");
+	btw("Assignment succeeds, triggering MNCC_RTP_CREATE ack to MNCC");
 	cc_to_mncc_expect_tx("", MNCC_RTP_CREATE);
-	crcx_ok(RTP_TO_CN);
+	ms_sends_assignment_complete(CODEC_AMR_8000_1);
+	OSMO_ASSERT(cc_to_mncc_tx_confirmed);
 
 	btw("MNCC says that's fine");
 	dtap_expect_tx("8302" /* CC: Call Proceeding */);
diff --git a/tests/msc_vlr/msc_vlr_test_call.err b/tests/msc_vlr/msc_vlr_test_call.err
index b450a3e6b..1d5b33242 100644
--- a/tests/msc_vlr/msc_vlr_test_call.err
+++ b/tests/msc_vlr/msc_vlr_test_call.err
@@ -275,7 +275,7 @@ DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE
 
 
 - a call is initiated
-- SETUP gets forwarded to MNCC
+- CC SETUP causes CRCX towards CN
   MSC <--UTRAN-Iu-- MS: GSM48_MT_CC_SETUP
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_AUTHENTICATED}: + rx_from_ms: now used by 2 (cm_service_cc,rx_from_ms)
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_AUTHENTICATED}: RAN decode: DTAP
@@ -288,49 +288,50 @@ DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - cm_service_cc: now used by 2 (rx_from_ms,cc)
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) rx SETUP in state NULL
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) starting guard timer with 180 seconds
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) SETUP to 123
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) new state NULL -> INITIATED
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) SETUP to 123
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) Cannot compose SDP for MNCC_SETUP_IND: no RTP set up for the CN side
-DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) tx MNCC_SETUP_IND
-  MSC --> MNCC: callref 0x80000001: MNCC_SETUP_IND
-DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
-- MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN
-  MSC <-- MNCC: callref 0x80000001: MNCC_RTP_CREATE
-
-DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) rx MNCC_RTP_CREATE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Starting call assignment
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Allocated
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: is child of msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x80000001 codecs=AMR:octet-align=1#112
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
   MGW <--CRCX to RTP_TO_RAN-- MSC: callref=0x80000001 codecs=VND.3GPP.IUFP#96
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to VND.3GPP.IUFP#96
+DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
+- As soon as the MGW port towards CN is created, MNCC_SETUP_IND is triggered
+  MGW --CRCX OK to RTP_TO_CN--> MSC
+DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
+DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
+DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) tx MNCC_SETUP_IND
+  MSC --> MNCC: callref 0x80000001: MNCC_SETUP_IND
+- MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN
+  MSC <-- MNCC: callref 0x80000001: MNCC_RTP_CREATE
+
+DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) rx MNCC_RTP_CREATE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Assignment for this trans already started earlier
 - MGW acknowledges the CRCX, triggering Assignment
   MGW --CRCX OK to RTP_TO_RAN--> MSC
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_RAN: 10.23.23.1:23 (osmux=no:-2)
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) Sending Assignment Command with codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=10.23.23.1:23{AMR:octet-align=1#112}
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: RAN encode: ASSIGNMENT_COMMAND on UTRAN-Iu
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
-- Assignment succeeds, triggering CRCX to CN
+- Assignment succeeds, triggering MNCC_RTP_CREATE ack to MNCC
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: RAN decode: ASSIGNMENT_COMPLETE
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: setting remote addr to 1.2.3.4:1234
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Not committing: no MGW endpoint CI set up
-  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x80000001 codecs=AMR:octet-align=1#112
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
-- CN RTP address is available, trigger MNCC_RTP_CREATE
-  MGW --CRCX OK to RTP_TO_CN--> MSC
-DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
-DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
-DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: no change: codecs already set to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Not committing: no remote RTP address known
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) MNCC_RTP_CREATE SDP: :0{AMR:octet-align=1#112}
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) MNCC_RTP_CREATE SDP: 10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000001 tid-8) tx MNCC_RTP_CREATE
   MSC --> MNCC: callref 0x80000001: MNCC_RTP_CREATE
 - MNCC says that's fine
@@ -436,12 +437,12 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + vlr_subscr_c
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - vlr_subscr_cancel_attach_fsm: now used by 3 (attached,active-conn,msc_a_fsm_releasing_onenter)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: state_chg to RELEASING
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483649:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Removing from parent msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_RELEASING}: Received Event MSC_EV_CALL_LEG_TERM
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Deallocated, including all deferred deallocations
@@ -674,6 +675,15 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - lu_utran_tms
 
 - after a while, MNCC asks us to setup a call, causing Paging
   MSC <-- MNCC: callref 0x423: MNCC_SETUP_REQ
+v=0
+o=OsmoMSC 0 0 IN IP4 10.23.23.1
+s=GSM Call
+c=IN IP4 10.23.23.1
+t=0 0
+m=audio 23 RTP/AVP 112
+a=rtpmap:112 AMR/8000
+a=fmtp:112 octet-align=1
+a=ptime:20
 
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + mncc_tx_to_gsm_cc: now used by 2 (attached,mncc_tx_to_gsm_cc)
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + CC: now used by 3 (attached,mncc_tx_to_gsm_cc,CC)
@@ -765,14 +775,13 @@ DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 callref-0x42
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_AUTHENTICATED}: + cc: now used by 2 (paging-response,cc)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_AUTHENTICATED}: Received Event MSC_A_EV_TRANSACTION_ACCEPTED
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_AUTHENTICATED}: state_chg to MSC_A_ST_COMMUNICATING
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T303 with 30 seconds
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} result=:0{(no-codecs)}
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Got no information of remote audio codecs: neither SDP nor Bearer Capability. Trying anyway.
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} result=:0{AMR:octet-align=1#112,AMR-WB:octet-align=1#113}
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} remote=10.23.23.1:23{AMR:octet-align=1#112} result=:0{(no-codecs)}
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} remote=10.23.23.1:23{AMR:octet-align=1#112} result=:0{AMR:octet-align=1#112}
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state NULL -> CALL_PRESENT
+DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T303 with 30 seconds
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Sending DTAP: CC GSM48_MT_CC_SETUP
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: RAN encode: DTAP on UTRAN-Iu
-- DTAP --UTRAN-Iu--> MS: GSM48_MT_CC_SETUP: 030504076004050b060887
+- DTAP --UTRAN-Iu--> MS: GSM48_MT_CC_SETUP: 030504046004058b
 - DTAP matches expected message
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - Paging: now used by 3 (attached,CC,active-conn)
@@ -785,27 +794,27 @@ DRLL msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RES
 DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) rx CALL_CONF in state CALL_PRESENT
 DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T303
 DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T310 with 30 seconds
-DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state CALL_PRESENT -> MO_TERM_CALL_CONF
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Starting call assignment
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: Allocated
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: is child of msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x423 codecs=AMR:octet-align=1#112
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: Allocated
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
   MGW <--CRCX to RTP_TO_RAN-- MSC: callref=0x423 codecs=VND.3GPP.IUFP#96
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: Allocated
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to VND.3GPP.IUFP#96
+DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state CALL_PRESENT -> MO_TERM_CALL_CONF
 DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_CALL_CONF_IND
   MSC --> MNCC: callref 0x423: MNCC_CALL_CONF_IND
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
-- MNCC sends MNCC_RTP_CREATE
-  MSC <-- MNCC: callref 0x423: MNCC_RTP_CREATE
-
-DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) rx MNCC_RTP_CREATE
-DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Assignment for this trans already started earlier
 - MGW acknowledges the CRCX to RAN, triggering Assignment
   MGW --CRCX OK to RTP_TO_RAN--> MSC
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_RAN: 10.23.23.1:23 (osmux=no:-2)
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Sending Assignment Command with codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} remote=10.23.23.1:23{AMR:octet-align=1#112} result=:0{AMR:octet-align=1#112}
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: RAN encode: ASSIGNMENT_COMMAND on UTRAN-Iu
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
 - Assignment completes, triggering CRCX to CN
@@ -813,19 +822,19 @@ DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RE
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: setting remote addr to 1.2.3.4:1234
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Not committing: no MGW endpoint CI set up
-  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x423 codecs=AMR:octet-align=1#112,AMR-WB:octet-align=1#113
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: Allocated
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112,AMR-WB:octet-align=1#113
-- When the CN side RTP address is known, send MNCC_RTP_CREATE
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Assignment complete, but still waiting for the CRCX OK on the CN side RTP
+- MNCC sends MNCC_RTP_CREATE, which first waits for the CN side RTP
+  MSC <-- MNCC: callref 0x423: MNCC_RTP_CREATE
+
+DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) rx MNCC_RTP_CREATE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Assignment for this trans already started earlier
+- When the CN side RTP address is known, ack MNCC_RTP_CREATE with full SDP
   MGW --CRCX OK to RTP_TO_CN--> MSC
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
-DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Not committing: no remote RTP address known
-DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) MNCC_RTP_CREATE SDP: :0{AMR:octet-align=1#112}
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} remote=10.23.23.1:23{AMR:octet-align=1#112} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) MNCC_RTP_CREATE SDP: 10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_RTP_CREATE
   MSC --> MNCC: callref 0x423: MNCC_RTP_CREATE
 - Total time passed: 1.000023 s
@@ -837,7 +846,7 @@ DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100
 DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T310
 DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T301 with 180 seconds
 DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state MO_TERM_CALL_CONF -> CALL_RECEIVED
-DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
+DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} remote=10.23.23.1:23{AMR:octet-align=1#112} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_ALERT_IND
   MSC --> MNCC: callref 0x423: MNCC_ALERT_IND
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
@@ -914,12 +923,12 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + vlr_subscr_c
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - vlr_subscr_cancel_attach_fsm: now used by 3 (attached,active-conn,msc_a_fsm_releasing_onenter)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: state_chg to RELEASING
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){RELEASING}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP))
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP))
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP))
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){RELEASING}: Removing from parent msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_RELEASING}: Received Event MSC_EV_CALL_LEG_TERM
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){RELEASING}: Deallocated, including all deferred deallocations
@@ -1152,6 +1161,15 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - lu_utran_tms
 
 - after a while, MNCC asks us to setup a call, causing Paging
   MSC <-- MNCC: callref 0x423: MNCC_SETUP_REQ
+v=0
+o=OsmoMSC 0 0 IN IP4 10.23.23.1
+s=GSM Call
+c=IN IP4 10.23.23.1
+t=0 0
+m=audio 23 RTP/AVP 112
+a=rtpmap:112 AMR/8000
+a=fmtp:112 octet-align=1
+a=ptime:20
 
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + mncc_tx_to_gsm_cc: now used by 2 (attached,mncc_tx_to_gsm_cc)
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + CC: now used by 3 (attached,mncc_tx_to_gsm_cc,CC)
@@ -1243,14 +1261,13 @@ DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 callref-0x42
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_AUTHENTICATED}: + cc: now used by 2 (paging-response,cc)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_AUTHENTICATED}: Received Event MSC_A_EV_TRANSACTION_ACCEPTED
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_AUTHENTICATED}: state_chg to MSC_A_ST_COMMUNICATING
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T303 with 30 seconds
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} result=:0{(no-codecs)}
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Got no information of remote audio codecs: neither SDP nor Bearer Capability. Trying anyway.
-DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} result=:0{AMR:octet-align=1#112,AMR-WB:octet-align=1#113}
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} remote=10.23.23.1:23{AMR:octet-align=1#112} result=:0{(no-codecs)}
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} remote=10.23.23.1:23{AMR:octet-align=1#112} result=:0{AMR:octet-align=1#112}
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state NULL -> CALL_PRESENT
+DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T303 with 30 seconds
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Sending DTAP: CC GSM48_MT_CC_SETUP
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: RAN encode: DTAP on UTRAN-Iu
-- DTAP --UTRAN-Iu--> MS: GSM48_MT_CC_SETUP: 030504076004050b060887
+- DTAP --UTRAN-Iu--> MS: GSM48_MT_CC_SETUP: 030504046004058b
 - DTAP matches expected message
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - Paging: now used by 3 (attached,CC,active-conn)
@@ -1263,19 +1280,32 @@ DRLL msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RES
 DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) rx CALL_CONF in state CALL_PRESENT
 DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T303
 DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T310 with 30 seconds
-DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state CALL_PRESENT -> MO_TERM_CALL_CONF
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Starting call assignment
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: Allocated
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: is child of msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x423 codecs=AMR:octet-align=1#112
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: Allocated
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
   MGW <--CRCX to RTP_TO_RAN-- MSC: callref=0x423 codecs=VND.3GPP.IUFP#96
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: Allocated
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to VND.3GPP.IUFP#96
+DCC trans(CC:CALL_PRESENT IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state CALL_PRESENT -> MO_TERM_CALL_CONF
 DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_CALL_CONF_IND
   MSC --> MNCC: callref 0x423: MNCC_CALL_CONF_IND
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
-- MNCC sends MNCC_RTP_CREATE
+- MNCC sends MNCC_RTP_CREATE, which first waits for the CN side RTP
   MSC <-- MNCC: callref 0x423: MNCC_RTP_CREATE
+v=0
+o=OsmoMSC 0 0 IN IP4 10.23.23.1
+s=GSM Call
+c=IN IP4 10.23.23.1
+t=0 0
+m=audio 23 RTP/AVP 112
+a=rtpmap:112 AMR/8000
+a=fmtp:112 octet-align=1
+a=ptime:20
 
 DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) rx MNCC_RTP_CREATE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Assignment for this trans already started earlier
@@ -1284,6 +1314,7 @@ DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RE
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_RAN: 10.23.23.1:23 (osmux=no:-2)
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Sending Assignment Command with codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} remote=10.23.23.1:23{AMR:octet-align=1#112} result=:0{AMR:octet-align=1#112}
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: RAN encode: ASSIGNMENT_COMMAND on UTRAN-Iu
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
 - Assignment completes, triggering CRCX to CN
@@ -1291,19 +1322,14 @@ DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RE
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: setting remote addr to 1.2.3.4:1234
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Not committing: no MGW endpoint CI set up
-  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x423 codecs=AMR:octet-align=1#112,AMR-WB:octet-align=1#113
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: Allocated
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112,AMR-WB:octet-align=1#113
-- When the CN side RTP address is known, send MNCC_RTP_CREATE
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Assignment complete, but still waiting for the CRCX OK on the CN side RTP
+- When the CN side RTP address is known, ack MNCC_RTP_CREATE with full SDP
   MGW --CRCX OK to RTP_TO_CN--> MSC
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
-DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Not committing: no remote RTP address known
-DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) MNCC_RTP_CREATE SDP: :0{AMR:octet-align=1#112}
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} remote=10.23.23.1:23{AMR:octet-align=1#112} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
+DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) MNCC_RTP_CREATE SDP: 10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_RTP_CREATE
   MSC --> MNCC: callref 0x423: MNCC_RTP_CREATE
 - Total time passed: 1.000023 s
@@ -1315,7 +1341,7 @@ DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100
 DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T310
 DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T301 with 180 seconds
 DCC trans(CC:MO_TERM_CALL_CONF IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state MO_TERM_CALL_CONF -> CALL_RECEIVED
-DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
+DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} remote=10.23.23.1:23{AMR:octet-align=1#112} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_ALERT_IND
   MSC --> MNCC: callref 0x423: MNCC_ALERT_IND
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
@@ -1345,12 +1371,12 @@ DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RES
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_RELEASING}: Received Event MSC_A_EV_UNUSED
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){ESTABLISHING}: state_chg to RELEASING
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){RELEASING}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP))
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP))
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP))
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP:trans-0:call-1059:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){RELEASING}: Removing from parent msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_RELEASING}: Received Event MSC_EV_CALL_LEG_TERM
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){RELEASING}: Deallocated, including all deferred deallocations
@@ -1664,7 +1690,7 @@ DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE
 
 
 - a call is initiated
-- SETUP gets forwarded to MNCC
+- CC SETUP causes CRCX towards CN
   MSC <--UTRAN-Iu-- MS: GSM48_MT_CC_SETUP
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_AUTHENTICATED}: + rx_from_ms: now used by 2 (cm_service_cc,rx_from_ms)
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_AUTHENTICATED}: RAN decode: DTAP
@@ -1677,49 +1703,50 @@ DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - cm_service_cc: now used by 2 (rx_from_ms,cc)
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) rx SETUP in state NULL
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) starting guard timer with 180 seconds
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) SETUP to 123
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) new state NULL -> INITIATED
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) SETUP to 123
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) Cannot compose SDP for MNCC_SETUP_IND: no RTP set up for the CN side
-DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) tx MNCC_SETUP_IND
-  MSC --> MNCC: callref 0x80000002: MNCC_SETUP_IND
-DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
-- MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN
-  MSC <-- MNCC: callref 0x80000002: MNCC_RTP_CREATE
-
-DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) rx MNCC_RTP_CREATE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Starting call assignment
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Allocated
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: is child of msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x80000002 codecs=AMR:octet-align=1#112
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
   MGW <--CRCX to RTP_TO_RAN-- MSC: callref=0x80000002 codecs=VND.3GPP.IUFP#96
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to VND.3GPP.IUFP#96
+DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
+- As soon as the MGW port towards CN is created, MNCC_SETUP_IND is triggered
+  MGW --CRCX OK to RTP_TO_CN--> MSC
+DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
+DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
+DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) tx MNCC_SETUP_IND
+  MSC --> MNCC: callref 0x80000002: MNCC_SETUP_IND
+- MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN
+  MSC <-- MNCC: callref 0x80000002: MNCC_RTP_CREATE
+
+DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) rx MNCC_RTP_CREATE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Assignment for this trans already started earlier
 - MGW acknowledges the CRCX, triggering Assignment
   MGW --CRCX OK to RTP_TO_RAN--> MSC
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_RAN: 10.23.23.1:23 (osmux=no:-2)
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) Sending Assignment Command with codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=10.23.23.1:23{AMR:octet-align=1#112}
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: RAN encode: ASSIGNMENT_COMMAND on UTRAN-Iu
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
-- Assignment succeeds, triggering CRCX to CN
+- Assignment succeeds, triggering MNCC_RTP_CREATE ack to MNCC
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: RAN decode: ASSIGNMENT_COMPLETE
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: setting remote addr to 1.2.3.4:1234
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Not committing: no MGW endpoint CI set up
-  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x80000002 codecs=AMR:octet-align=1#112
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
-- CN RTP address is available, trigger MNCC_RTP_CREATE
-  MGW --CRCX OK to RTP_TO_CN--> MSC
-DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
-DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
-DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: no change: codecs already set to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Not committing: no remote RTP address known
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) MNCC_RTP_CREATE SDP: :0{AMR:octet-align=1#112}
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) MNCC_RTP_CREATE SDP: 10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000002 tid-8) tx MNCC_RTP_CREATE
   MSC --> MNCC: callref 0x80000002: MNCC_RTP_CREATE
 - MNCC says that's fine
@@ -1780,12 +1807,12 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + vlr_subscr_c
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - vlr_subscr_cancel_attach_fsm: now used by 3 (attached,active-conn,msc_a_fsm_releasing_onenter)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: state_chg to RELEASING
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483650:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Removing from parent msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_RELEASING}: Received Event MSC_EV_CALL_LEG_TERM
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Deallocated, including all deferred deallocations
@@ -2098,7 +2125,7 @@ DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE
 
 
 - a call is initiated
-- SETUP gets forwarded to MNCC
+- CC SETUP causes CRCX towards CN
   MSC <--UTRAN-Iu-- MS: GSM48_MT_CC_SETUP
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_AUTHENTICATED}: + rx_from_ms: now used by 2 (cm_service_cc,rx_from_ms)
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_AUTHENTICATED}: RAN decode: DTAP
@@ -2111,49 +2138,50 @@ DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE
 DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - cm_service_cc: now used by 2 (rx_from_ms,cc)
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) rx SETUP in state NULL
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) starting guard timer with 180 seconds
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) SETUP to 123
+DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
 DCC trans(CC:NULL IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) new state NULL -> INITIATED
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) SETUP to 123
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) Cannot compose SDP for MNCC_SETUP_IND: no RTP set up for the CN side
-DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) tx MNCC_SETUP_IND
-  MSC --> MNCC: callref 0x80000003: MNCC_SETUP_IND
-DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
-- MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN
-  MSC <-- MNCC: callref 0x80000003: MNCC_RTP_CREATE
-
-DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) rx MNCC_RTP_CREATE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Starting call assignment
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Allocated
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: is child of msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x80000003 codecs=AMR:octet-align=1#112
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
   MGW <--CRCX to RTP_TO_RAN-- MSC: callref=0x80000003 codecs=VND.3GPP.IUFP#96
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to VND.3GPP.IUFP#96
+DREF msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: - rx_from_ms: now used by 1 (cc)
+- As soon as the MGW port towards CN is created, MNCC_SETUP_IND is triggered
+  MGW --CRCX OK to RTP_TO_CN--> MSC
+DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
+DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
+DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) tx MNCC_SETUP_IND
+  MSC --> MNCC: callref 0x80000003: MNCC_SETUP_IND
+- MNCC replies with MNCC_RTP_CREATE, causing MGW endpoint CRCX to RAN
+  MSC <-- MNCC: callref 0x80000003: MNCC_RTP_CREATE
+
+DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) rx MNCC_RTP_CREATE
+DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Assignment for this trans already started earlier
 - MGW acknowledges the CRCX, triggering Assignment
   MGW --CRCX OK to RTP_TO_RAN--> MSC
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_RAN: 10.23.23.1:23 (osmux=no:-2)
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) Sending Assignment Command with codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=10.23.23.1:23{AMR:octet-align=1#112}
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: RAN encode: ASSIGNMENT_COMMAND on UTRAN-Iu
 DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
-- Assignment succeeds, triggering CRCX to CN
+- Assignment succeeds, triggering MNCC_RTP_CREATE ack to MNCC
 DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: RAN decode: ASSIGNMENT_COMPLETE
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI:local-10-23-23-1-23){UNINITIALIZED}: setting remote addr to 1.2.3.4:1234
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Not committing: no MGW endpoint CI set up
-  MGW <--CRCX to RTP_TO_CN-- MSC: callref=0x80000003 codecs=AMR:octet-align=1#112
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: Allocated
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){UNINITIALIZED}: is child of call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: setting codecs to AMR:octet-align=1#112
-- CN RTP address is available, trigger MNCC_RTP_CREATE
-  MGW --CRCX OK to RTP_TO_CN--> MSC
-DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: Received Event CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE
-DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: Received Event MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE
-DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_COMMUNICATING}: MGW endpoint's RTP address available for the CI RTP_TO_CN: 10.23.23.1:23 (osmux=no:-2)
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} result=:0{AMR:octet-align=1#112}
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) codecs: RAN={AMR:octet-align=1#112,AMR-WB:octet-align=1#113} MS={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111} assigned=AMR:octet-align=1#112 result=10.23.23.1:23{AMR:octet-align=1#112}
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: no change: codecs already set to AMR:octet-align=1#112
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Not committing: no remote RTP address known
-DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) MNCC_RTP_CREATE SDP: :0{AMR:octet-align=1#112}
+DCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) MNCC_RTP_CREATE SDP: 10.23.23.1:23{AMR:octet-align=1#112}
 DMNCC trans(CC:INITIATED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ callref-0x80000003 tid-8) tx MNCC_RTP_CREATE
   MSC --> MNCC: callref 0x80000003: MNCC_RTP_CREATE
 - MNCC says that's fine
@@ -2211,12 +2239,12 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + vlr_subscr_c
 DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - vlr_subscr_cancel_attach_fsm: now used by 3 (attached,active-conn,msc_a_fsm_releasing_onenter)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){ESTABLISHING}: state_chg to RELEASING
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
-DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_RAN:no-CI:local-10-23-23-1-23:remote-1-2-3-4-1234){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Terminating in cascade, depth 2 (cause = OSMO_FSM_TERM_PARENT, caused by: call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ))
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Removing from parent call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
+DCC rtp_stream(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ:trans-8:call-2147483651:RTP_TO_CN:no-CI){UNINITIALIZED}: Deferring: will deallocate with call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Removing from parent msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ)
 DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){MSC_A_ST_RELEASING}: Received Event MSC_EV_CALL_LEG_TERM
 DCC call_leg(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:CM_SERVICE_REQ){RELEASING}: Deallocated, including all deferred deallocations
author	Neels Hofmeyr <nhofmeyr@sysmocom.de>	2022-01-13 23:18:02 +0100
committer	Neels Hofmeyr <nhofmeyr@sysmocom.de>	2022-10-13 16:12:26 +0200
commit	d338b1e6f749c678307b2d0e6a58c4ab3f690b06 (patch)
tree	15c01681a65f922968c210f0146faa186562b141
parent	05236e6d68c1d3dfd2b60ed7f9024586bb73069d (diff)