Re: [SR-Users] TCP message parsing & connection close issue

Hello, I've got an odd issue where: 1. TCP client makes call out through Kamailio. 2. Call is answered, TCP client sends e2e ACK. 3. Parser chokes on ACK, closes TCP connection (SYN+FIN). 4. Subsequent messages from the client, immediately following the ACK (about 240 ms later), come through because the client is halfway around the world - about 250 ms away - and is not yet aware the connection has been closed. Otherwise, it would presumably try to re-establish the connection before sending anything. Anyway, messages from the parser concerning the ACK are: --- Aug 4 21:55:57 sip-proxy /usr/local/kamailio/sbin/kamailio[14680]: INFO: <core> [parser/parse_fline.c:144]: parse_first_line(): ERROR:parse_first_line: method not followed by SP Aug 4 21:55:57 sip-proxy /usr/local/kamailio/sbin/kamailio[14680]: ERROR: <core> [parser/parse_fline.c:257]: parse_first_line(): parse_first_line: bad message (offset: 0) Aug 4 21:55:57 sip-proxy /usr/local/kamailio/sbin/kamailio[14680]: ERROR: <core> [parser/msg_parser.c:690]: parse_msg(): ERROR: parse_msg: message=<0#015#012a=rtcp:4007 IN IP4 1.1.1.1:1071#015#012a=sendrecv#015#012a=rtpmap:0 PCMU/8000#015#012a=rtpmap:8 PCMA/8000#015#012a=rtpmap:96 telephone-event/8000#015#012a=fmtp:96 0-16#015#012ACK sip:*98*0b3ff883-a89d-4317-b758-8979682f5357@10.0.2.53:5060;transport=udp SIP/2.0#015#012Via: SIP/2.0/TCP 1.1.1.1:61979;branch=z9hG4bKPjc15bf9fdded940cab7f859634b9f036e;alias#015#012Max-Forwards: 70#015#012From: sip:4b57be8d-267d-48c4-aa82-0f3a269d74cb@sip.evaristesys.com;tag=dd1d7fd0344d47b7b22c4017091df17a#015#012To: sip:*98*0b3ff883-a89d-4317-b758-8979682f5357@sip.evaristesys.com;tag=2rZDKcBFmU65S#015#012Call-ID: 5ba5a84451074159aaaa931eb1f98fe5#015#012CSeq: 3071 ACK#015#012Route: <sip:2.2.2.2;transport=tcp;lr;r2=on;ftag=dd1d7fd0344d47b7b22c4017091df17a;rtp_set_id=1>#015#012Route: <sip:10.0.2.119;lr;r2=on;ftag=dd1d7fd0344d47b7b22c4017091df17a;rtp_set_id=1>#015#012Content-Length: 0#015#012#015#012> Aug 4 21:55:57 sip-proxy /usr/local/kamailio/sbin/kamailio[14680]: ERROR: <core> [receive.c:173]: receive_msg(): core parsing of SIP message failed (1.1.1.1:61979/2) --- That doesn't look like a clean message buffer to me. The message should start here: ACK sip:*98*0b3ff883-a89d-4317-b758-8979682f5357@10.0.2.53:5060;transport=udp SIP/2.0#015#012Via: SIP/2.0/TCP ... But instead it's got these SDP attributes prepended: 0#015#012a=rtcp:4007 IN IP4 1.1.1.1:1071#015#012a=sendrecv#015#012a=rtpmap:0 PCMU/8000#015#012a=rtpmap:8 PCMA/8000#015#012a=rtpmap:96 telephone-event/8000#015#012a=fmtp:96 0-16#015#012 These SDP attribute appear to have fallen off the back of the SDP offer in the initial INVITE: v=0 o=- 3679365582 3679365582 IN IP4 10.0.0.200 s=pjmedia t=0 0 m=audio 4006 RTP/AVP 0 8 96 c=IN IP4 1.1.1.1 The relationship between the 4006 RTP port and the 4007 RTCP port suggests that these two things belong together. This is on kamailio 4.4.0 (x86_64/linux) d4f23c. Any help would be greatly appreciated! The issue is consistently reproducible and this happens every time. Cheers, -- Alex