Sorry, I realised I copy pasted wrong log messages for Call 1. Here's the relevant part showing success for call 1 in contrast with Call 2: grep 2a859fcc4e1c8f840191a81d7c16e76d kamailio.log | egrep 'check_ruri_scheme|w_sanity_check' | grep ACK Jul  7 18:42:11 lbpub0-stage-lhe0-cn1 /usr/sbin/kamailio[907]: DEBUG: {1 <null> 172.30.154.189 102 ACK 2a859fcc4e1c8f840191a81d7c16e76d(a)voip.domain.com <mailto:2a859fcc4e1c8f840191a81d7c16e76d@voip.domain.com> - sanity [sanity.c:277]: check_ruri_scheme(): check_ruri_scheme entered Jul  7 18:42:11 lbpub0-stage-lhe0-cn1 /usr/sbin/kamailio[907]: DEBUG: {1 <null> 172.30.154.189 102 ACK 2a859fcc4e1c8f840191a81d7c16e76d(a)voip.domain.com <mailto:2a859fcc4e1c8f840191a81d7c16e76d@voip.domain.com> - sanity [sanity.c:297]: check_ruri_scheme(): check_ruri_scheme passed Jul  7 18:42:11 lbpub0-stage-lhe0-cn1 /usr/sbin/kamailio[907]: DEBUG: {1 <null> 172.30.154.189 102 ACK 2a859fcc4e1c8f840191a81d7c16e76d(a)voip.domain.com <mailto:2a859fcc4e1c8f840191a81d7c16e76d@voip.domain.com> - sanity [sanity_mod.c:254]: w_sanity_check(): sanity checks result: 1 On Tue, 7 Jul 2020 at 21:34, George Diamantopoulos &lt;georgediam(a)gmail.com <mailto:georgediam@gmail.com>> wrote: Hello all, I'm not 100% sure this is the only culprit in an issue I'm investigating, but superficially it appears that RURI scheme sanity module checks from the default config (flags 17895in REQINIT) fail if the RURI in an ACK following a 487 includes parameters. Example from two calls from a kamailio instance acting as registrar/usrloc server, INVITE RURIs are after usrloc lookup: Call 1: INVITE sip:voip-test-gd@172.17.173.14:5063 <http://sip:voip-test-gd@172.17.173.14:5063> SIP/2.0 Call 2: INVITE sip:voip-test-user-02@10.2.24.142:32768;line=moo62e08 SIP/2.0 These INVITEs produce no complaints. Later, the same registrar produces ACKs to acknowledge 487 (thus, same transaction ACKs) responses from the next proxy in the path following a CANCEL: Call 1: ACK sip:voip-test-gd@172.17.173.14:5063 <http://sip:voip-test-gd@172.17.173.14:5063> SIP/2.0 Call 2: ACK sip:voip-test-user-02@10.2.24.142:32768;line=moo62e08 SIP/2.0 The next proxy (which produced/relayed the 487) processes the ACK for Call 1 successfully, but sanity_check at the proxy drops the request for Call 2 with: DEBUG: {1 <null> 172.30.154.189 102 ACK 08679c4228983f9e65f3b47f767b6e07(a)voip.domain.com <mailto:08679c4228983f9e65f3b47f767b6e07@voip.domain.com> - sanity [sanity.c:277]: check_ruri_scheme(): check_ruri_scheme entered DEBUG: {1 <null> 172.30.154.189 102 ACK 08679c4228983f9e65f3b47f767b6e07(a)voip.domain.com <mailto:08679c4228983f9e65f3b47f767b6e07@voip.domain.com> - sanity [sanity_mod.c:254]: w_sanity_check(): sanity checks result: 0 whereas Call 1 seems OK: DEBUG: {1 <null> 172.30.154.189 102 ACK 2a859fcc4e1c8f840191a81d7c16e76d(a)voip.domain.com <mailto:2a859fcc4e1c8f840191a81d7c16e76d@voip.domain.com> - sanity [sanity.c:305]: check_required_headers(): check_required_headers entered DEBUG: {1 <null> 172.30.154.189 102 ACK 2a859fcc4e1c8f840191a81d7c16e76d(a)voip.domain.com <mailto:2a859fcc4e1c8f840191a81d7c16e76d@voip.domain.com> - sanity [sanity.c:313]: check_required_headers(): check_required_headers passed Could this be a bug in sanity module? Is there anything one can do in config which could result in illegal ACKs being produced for hop-by-hop transactions? schema appears to be sip: in both cases... Thank you. Best regards, George _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users