[sr-dev] [kamailio/kamailio] SCSCF failing to send INVITE to application server. (Issue #3015)

[SJ286]

We are trying to test private VoLTE setup with real UEs using open5gs EPC , kamailio IMS and application server. We see INVITE request reaching till term-SCSCF with URL (sip:405874000000955 at ims.mnc874.mcc405.3gppnetwork.org;user=phone) but it is not forwarding request to application server. SCSCF is trying to fetch IMPU record for application server with tel uri even though it receives SIP uri in INVITE message. Hence fails to reach application server.

Could anyone help us on why 'isc_match_filter()' function is returning tel uri even though it is receiving sip uri in message? 

Attaching log and pcap for reference.

#### SCSCF logs

scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:253]: isc_match_filter(): Starting triggering
scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:323]: isc_match_filter(): Checking if ISC is for originating user
scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:362]: isc_match_filter(): Checking if ISC is for terminating user
scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:372]: isc_match_filter(): ISC is for Term user
scscf        |  3(34) DEBUG: ims_isc [checker.c:586]: isc_is_registered(): Searching in usrloc
scscf        |  3(34) DEBUG: ims_isc [checker.c:589]: isc_is_registered(): no record exists for [tel:405874000000955]
scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:380]: isc_match_filter(): Term User <tel:405874000000955> [0]
scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:383]: isc_match_filter(): Checking if RURI has changed...comparing: <> and <tel:405874000000955>
scscf        |  3(34) DEBUG: ims_isc [ims_isc_mod.c:390]: isc_match_filter(): Resuming triggering
scscf        |  3(34) DEBUG: ims_isc [checker.c:586]: isc_is_registered(): Searching in usrloc
scscf        |  3(34) DEBUG: ims_isc [checker.c:589]: isc_is_registered(): no record exists for [tel:405874000000955]
scscf        |  3(34) DEBUG: ims_isc [checker.c:431]: isc_checker_find(): isc_checker_find: starting search
scscf        |  3(34) ERROR: ims_isc [checker.c:448]: isc_checker_find(): Failure getting IMPU record for [tel:405874000000955] - ISC checker find METHOD: [INVITE]

[open5gs_test67.zip](https://github.com/kamailio/kamailio/files/7979412/open5gs_test67.zip)



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