Hello @christoph-v
Below log is from S-CSCF. For some reason S-CSCF is forwarding the packets to HSS(hss.net1.test:5065) and not to AS. When I run netcat(nc -vv -u -l 5065) on HSS, I am able to see SIP packets. Not sure why ims_isc module is sending the packets to HSS. HSS host name is present only on Bind configuration and scscf.xml file. So I am assuming that S-CSCF is picking <Defaultroute> parameter from scscf.xml.
``` 0(3491) DEBUG: ims_isc [checker.c:456]: isc_checker_find(): About to try p->s->service_profiles[a].filter_criterai_cnt 0(3491) DEBUG: ims_isc [checker.c:467]: isc_checker_find(): DEBUG ISC: SECOND TIME About to try p->s->service_profiles_cnt!! 0(3491) DEBUG: ims_isc [checker.c:471]: isc_checker_find(): DEBUG ISC : About to try p->s->service_profiles 0(3491) DEBUG: ims_isc [checker.c:474]: isc_checker_find(): DEBUG ISC : About to try public identities 0(3491) DEBUG: ims_isc [checker.c:477]: isc_checker_find(): DEBUG ISC : About to try WPSI 0(3491) DEBUG: ims_isc [checker.c:319]: isc_check_filter_criteria(): ifc_checker_trigger: Starting expression check: 0(3491) DEBUG: ims_isc [checker.c:239]: isc_check_spt(): ifc_check_spt: SPT type 2 -> Method == PUBLISH ? 0(3491) DEBUG: ims_isc [checker.c:241]: isc_check_spt(): ifc_check_spt: Found method SUBSCRIBE 0(3491) DEBUG: ims_isc [checker.c:340]: isc_check_filter_criteria(): ifc_checker_trigger: - group compromised, skipping to next group 0(3491) DEBUG: ims_isc [checker.c:239]: isc_check_spt(): ifc_check_spt: SPT type 2 -> Method == PUBLISH ? 0(3491) DEBUG: ims_isc [checker.c:241]: isc_check_spt(): ifc_check_spt: Found method SUBSCRIBE 0(3491) DEBUG: ims_isc [checker.c:333]: isc_check_filter_criteria(): ifc_checker_trigger: - group 1 => 0. 0(3491) DEBUG: ims_isc [checker.c:340]: isc_check_filter_criteria(): ifc_checker_trigger: - group compromised, skipping to next group 0(3491) DEBUG: ims_isc [checker.c:239]: isc_check_spt(): ifc_check_spt: SPT type 2 -> Method == SUBSCRIBE ? 0(3491) DEBUG: ims_isc [checker.c:241]: isc_check_spt(): ifc_check_spt: Found method SUBSCRIBE 0(3491) DEBUG: ims_isc [checker.c:333]: isc_check_filter_criteria(): ifc_checker_trigger: - group 2 => 1. 0(3491) DEBUG: ims_isc [checker.c:252]: isc_check_spt(): ifc_check_spt: SPT type 3 -> Header[Event] %= .*presence.* ? 0(3491) DEBUG: ims_isc [checker.c:88]: isc_check_headers(): isc_check_headers: Looking for Header[Event(22)] .*presence.* 0(3491) DEBUG: ims_isc [checker.c:99]: isc_check_headers(): isc_check_headers: Found Header[Event(22)] message-summary 0(3491) DEBUG: ims_isc [checker.c:99]: isc_check_headers(): isc_check_headers: Found Header[Allow-Events(39)] refer, presence, presence.winfo, xcap-diff, conference 0(3491) DEBUG: ims_isc [checker.c:261]: isc_check_spt(): ifc_check_spt: SPT type 4 -> Session Case == 1 ? 0(3491) DEBUG: ims_isc [checker.c:263]: isc_check_spt(): ifc_check_spt: Found session_case 1 0(3491) DEBUG: ims_isc [checker.c:326]: isc_check_filter_criteria(): ifc_checker_trigger: Total compromised, aborting... 0(3491) DEBUG: ims_isc [checker.c:518]: isc_checker_find(): isc_checker_find: MATCH -> sip:hss.net1.test:5065 () handling 0 0(3491) DEBUG: ims_isc [isc.c:63]: isc_forward(): marking for AS sip:hss.net1.test:5065 0(3491) DEBUG: ims_isc [mark.c:207]: isc_mark_drop_route(): ifc_mark_drop_route: Start --------- 0(3491) DEBUG: ims_isc [mark.c:221]: isc_mark_drop_route(): ifc_mark_drop_route: ---------- End 0(3491) DEBUG: ims_isc [mark.c:293]: isc_mark_write_route(): isc_mark_write_route: <Route: sip:hss.net1.test:5065;lr, sip:iscmark@scscf.net1.test;lr;s=1;h=0;d=1;a=7369703a616c69636540696d732e6d6e633030312e6d63633030312e336770706e6574776f726b2e6f7267
0(3491) DEBUG: ims_isc [mark.c:355]: isc_mark_write_psu(): isc_mark_write_psu: P-Served-User: sip:alice@net1.test;sescase=term;regstate=reg 0(3491) DEBUG: ims_isc [mark.c:259]: isc_mark_set(): isc_mark_set: NEW mark sip:iscmark@net1.test;lr;s=1;h=0;d=1;a=7369703a616c69636540696d732e6d6e633030312e6d63633030312e336770706e6574776f726b2e6f7267 ```