[SR-Users] Problem with Kamailio not routing ACK to a 200 OK

Hi, I have a strange problem with Kamailio 3.0.2. When one of our end users makes a call Kamailio does not route the ACK (in response to the 200 OK). For all other end users it works fine. For me it looks the the has_totag() checks for some reason fails and then t_check_trans() thinks it is a ACK to a local transactions and then terminates the script. Otherwise there should be more lines in the log file. The conf is pretty standard. route{ xlog("L_WARN", "New request - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); xlog("L_WARN", "ua=$ua"); if (!mf_process_maxfwd_header("10")) { sl_send_reply("483","Too Many Hops"); exit; } if(!sanity_check("1511", "7")) { xlog("Malformed SIP message from $si:$sp\n"); exit; } if (has_totag()) { xlog("L_WARN", "has_totag start - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); # sequential request withing a dialog should # take the path determined by record-routing if (loose_route()) { xlog("L_WARN", "loose_route - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); route(RELAY); } else { if (is_method("SUBSCRIBE") && uri == myself) { # in-dialog subscribe requests #route(PRESENCE); exit; } if ( is_method("ACK") ) { if ( t_check_trans() ) { xlog("L_WARN", "ACK t_check_trans - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); # non loose-route, but stateful ACK; must be an ACK after a 487 or e.g. 404 from upstream server t_relay(); exit; } else { xlog("Ignoring ACK - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); # ACK without matching transaction ... ignore and discard.\n"); exit; } } sl_send_reply("404","Not here"); } xlog("L_WARN", "has_totag end - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); exit; } #initial requests # CANCEL processing if (is_method("CANCEL")) { if (t_check_trans()) t_relay(); exit; } setflag(4); t_check_trans(); ... The log files show: Oct 28 10:51:13 sip-core-1 /usr/local/sbin/kamailio[10503]: WARNING: <script>: New request - M=ACK RURI=sip:1105@178.21.248.56:5060 F=sip:87776688@sip.uni-tel.dk T=sip:869 87106(a)sip.uni-tel.dk IP=178.21.248.20 ID=AI231CA9BD0A4A1C53(a)10.0.0.150 Oct 28 10:51:13 sip-core-1 /usr/local/sbin/kamailio[10503]: WARNING: <script>: ua=Aastra Intelligate The trace U 2010/10/28 10:51:02.616337 178.21.248.7:5060 -> 178.21.248.56:5060 INVITE sip:86987106@178.21.248.56 SIP/2.0. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>. Record-Route: <sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. To: <sip:86987106@sip.uni-tel.dk>. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Max-Forwards: 68. Contact: <sip:87776688@87.104.233.108:5060;line=AI7EFC34995E724DD7>. Accept: application/sdp. Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER. P-Preferred-Identity: <sip:87776688@sip.uni-tel.dk>. Privacy: none. User-Agent: Aastra Intelligate. Content-Type: application/sdp. Content-Length: 280. X-trunktype: IC. . v=0. o=intelligate 1194032777 1194032777 IN IP4 87.104.233.106. s=call. c=IN IP4 178.21.248.22. t=0 0. m=audio 60984 RTP/AVP 8 0 18 101. a=rtpmap:8 PCMA/8000. a=rtpmap:0 PCMU/8000. a=rtpmap:18 G729/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=sendrecv. a=ptime:20. # U 2010/10/28 10:51:02.636854 178.21.248.56:5060 -> 178.21.248.7:5060 SIP/2.0 100 Trying. Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Length: 0. . ##### U 2010/10/28 10:51:04.134445 178.21.248.56:5060 -> 178.21.248.7:5060 SIP/2.0 183 Session Progress. Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Contact: <sip:1105@178.21.248.56:5060>. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>,<sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Type: application/sdp. Content-Length: 259. . v=0. o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56. s=Phone-Call. c=IN IP4 178.21.248.56. t=0 0. m=audio 6050 RTP/AVP 8 101. c=IN IP4 178.21.248.56. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=ptime:20. a=sendrecv. # U 2010/10/28 10:51:04.134748 178.21.248.7:5060 -> 178.21.248.20:5060 SIP/2.0 183 Session Progress. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Contact: <sip:1105@178.21.248.56:5060>. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>,<sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Type: application/sdp. Content-Length: 259. . v=0. o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56. s=Phone-Call. c=IN IP4 178.21.248.56. t=0 0. m=audio 6050 RTP/AVP 8 101. c=IN IP4 178.21.248.56. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=ptime:20. a=sendrecv. # U 2010/10/28 10:51:04.136586 178.21.248.56:5060 -> 178.21.248.7:5060 SIP/2.0 180 Ringing. Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Contact: <sip:1105@178.21.248.56:5060>. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>,<sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Type: application/sdp. Content-Length: 259. . v=0. o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56. s=Phone-Call. c=IN IP4 178.21.248.56. t=0 0. m=audio 6050 RTP/AVP 8 101. c=IN IP4 178.21.248.56. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=ptime:20. a=sendrecv. # U 2010/10/28 10:51:04.136837 178.21.248.7:5060 -> 178.21.248.20:5060 SIP/2.0 180 Ringing. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Contact: <sip:1105@178.21.248.56:5060>. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>,<sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Type: application/sdp. Content-Length: 259. . v=0. o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56. s=Phone-Call. c=IN IP4 178.21.248.56. t=0 0. m=audio 6050 RTP/AVP 8 101. c=IN IP4 178.21.248.56. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=ptime:20. a=sendrecv. ############################## U 2010/10/28 10:51:12.881179 178.21.248.56:5060 -> 178.21.248.7:5060 SIP/2.0 200 OK. Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Contact: <sip:1105@178.21.248.56:5060>. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>,<sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Type: application/sdp. Content-Length: 259. . v=0. o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56. s=Phone-Call. c=IN IP4 178.21.248.56. t=0 0. m=audio 6050 RTP/AVP 8 101. c=IN IP4 178.21.248.56. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=ptime:20. a=sendrecv. # U 2010/10/28 10:51:12.882388 178.21.248.7:5060 -> 178.21.248.20:5060 SIP/2.0 200 OK. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 INVITE. Contact: <sip:1105@178.21.248.56:5060>. Record-Route: <sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>,<sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Supported: em,timer,replaces,path,early-session,resource-priority. Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE. Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002. Content-Type: application/sdp. Content-Length: 259. . v=0. o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56. s=Phone-Call. c=IN IP4 178.21.248.56. t=0 0. m=audio 6050 RTP/AVP 8 101. c=IN IP4 178.21.248.56. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=ptime:20. a=sendrecv. ##### <<<<<<<<<<<<<<<<<<<<<< This is the problem packet >>>>>>>>>>>>>>>>>>>>> U 2010/10/28 10:51:13.267863 178.21.248.20:5060 -> 178.21.248.7:5060 ACK sip:1105@178.21.248.56:5060 SIP/2.0. Record-Route: <sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F>. Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.2. Via: SIP/2.0/UDP 87.104.233.108:5060;rport=5060;branch=z9hG4bK07103fe69c8af048b9b8216eb2f7233f. To: <sip:86987106@sip.uni-tel.dk>;tag=1c2073920452. From: <sip:87776688@sip.uni-tel.dk>;tag=AI8DA85D59B9B6634F. Call-ID: AI231CA9BD0A4A1C53(a)10.0.0.150. CSeq: 2 ACK. Max-Forwards: 69. Route: <sip:178.21.248.7;lr=on;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02>. User-Agent: Aastra Intelligate. Content-Length: 0. -- Morten Isaksen