Hi ,

Yes , I have tried uncommenting that part . It is actually checking for hostname (sip.example.com:5060) in my scscf node. I am not sure why it is looking for sip.example.com instead of scscf.sip.example.com:4080

I have added one more alias in my scscf.cfg file .Now Domain not served issue has gone.

After that I am facing 483 Too Many Hops Error.

I have added scscf debug logs.

Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: <core> [core/mem/q_malloc.c:482]: qm_free(): qm_free(0x7fc57b362010, 0x7fc57b514138), called from ims_registrar_scscf: lookup.c: lookup(225)
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: <core> [core/mem/q_malloc.c:526]: qm_free(): freeing frag. 0x7fc57b514100 alloc'ed from ims_registrar_scscf: lookup.c: lookup(103)
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: ERROR: *** cfgtrace:request_route=[FINAL_TERM] c=[/etc/kamailio/scscf/kamailio.cfg] l=1041 a=16 n=if
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: <core> [core/socket_info.c:628]: grep_sock_info(): checking if host==us: 10==10 && [10.45.6.75] == [10.45.6.73]
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: <core> [core/socket_info.c:635]: grep_sock_info(): checking if port 4080 (advertise 0) matches port 32347
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: <core> [core/forward.c:412]: check_self(): host != me
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: ERROR: *** cfgtrace:request_route=[FINAL_TERM] c=[/etc/kamailio/scscf/kamailio.cfg] l=1050 a=5 n=route
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: ERROR: *** cfgtrace:request_route=[apply_privacy] c=[/etc/kamailio/scscf/kamailio.cfg] l=821 a=16 n=if
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: ERROR: *** cfgtrace:request_route=[apply_privacy] c=[/etc/kamailio/scscf/kamailio.cfg] l=818 a=25 n=is_present_hf
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: ERROR: *** cfgtrace:request_route=[FINAL_TERM] c=[/etc/kamailio/scscf/kamailio.cfg] l=1052 a=24 n=t_relay
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: tm [t_lookup.c:1328]: t_newtran(): msg (0x7fc57b502a70) id=2/7139 global id=2/7139 T start=(nil)
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: tm [t_lookup.c:497]: t_lookup_request(): start searching: hash=38849, isACK=0
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: tm [t_lookup.c:455]: matching_3261(): RFC3261 transaction matching failed - via branch [z9hG4bK1c79.03e4ec0c2ca15f1aa14c067b33a29f10.1]
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: tm [t_lookup.c:675]: t_lookup_request(): no transaction found
Apr 15 13:59:12 tel-VirtualBox kamailio[7139]: DEBUG: <core> [core/mem/q_malloc.c:374]: qm_malloc(): qm_malloc(0x7fc57478b000, 5720) called from tm: h_table.c: build_cell(330)

I am facing host is not me error . Here 10.45.6.73 -> scscf and 10.45.6.75 -> UE (bob user)

I am not sure what alias it is asking for . Kindly help.