Hi All.

Here is the tail end of a SIP conversation where a PSTN gateway (216.229.127.60) has sent my SER-0.9 server (10.3.0.221) a CANCEL request.

SER replied with a 200OK (which looks a bit suspicious), but then another INVITE attempt was sent out to the UA (216.79.198.156)

Can anyone give me a hint as to what might cause CANCEL to not destroy this SIP transaction?

Regards, Paul

U 2005/03/10 14:42:15.366046 10.3.0.221:5060 -> 216.79.198.156:15060 INVITE sip:3212514273@192.168.1.102:5060 SIP/2.0. Record-Route: sip:10.3.0.221;ftag=73767738-B82;lr. Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK18a5.75d0c4f5.0. Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118. Via: SIP/2.0/UDP 66.243.109.99:5060;branch=065c3d8f328ab962f47c763927c80fb3. To: 3212514273 sip:3212514273@66.243.109.99:5060. From: sip:7046639230@66.236.245.98;tag=73767738-B82. Call-ID: 8853950-3319472564-815436@66.243.109.99. CSeq: 1 INVITE. Max-Forwards: 3. Contact: sip:7046639230@66.243.109.99:5060. Record-Route: sip:216.229.127.60:5060;lr. Content-Type: application/sdp. Content-Length: 229. . v=0. o=NexTone-MSW 1234 8890 IN IP4 66.236.245.98. s=sip call. c=IN IP4 10.3.0.221. t=0 0. m=audio 36134 RTP/AVP 18 101. a=rtpmap:18 G729/8000. a=fmtp:18 annexb=no. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-16. a=ptime:20.

U 2005/03/10 14:42:19.101381 216.229.127.60:5060 -> 10.3.0.221:5060 CANCEL sip:3212514273@10.3.0.221:5060 SIP/2.0. Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118. To: 3212514273 sip:3212514273@66.243.109.99:5060. From: sip:7046639230@66.236.245.98;tag=73767738-B82. Call-ID: 8853950-3319472564-815436@66.243.109.99. CSeq: 1 CANCEL. Max-Forwards: 70. Content-Length: 0. .

# U 2005/03/10 14:42:19.104349 10.3.0.221:5060 -> 216.229.127.60:5060 SIP/2.0 200 ok -- no more pending branches. Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118. To: 3212514273 sip:3212514273@66.243.109.99:5060;tag=460b1844bd2d60209b47f7192c6e19c1-ae96. From: sip:7046639230@66.236.245.98;tag=73767738-B82. Call-ID: 8853950-3319472564-815436@66.243.109.99. CSeq: 1 CANCEL. Content-Length: 0. .

## U 2005/03/10 14:42:19.406049 10.3.0.221:5060 -> 216.79.198.156:15060 INVITE sip:3212514273@192.168.1.102:5060 SIP/2.0. Record-Route: sip:10.3.0.221;ftag=73767738-B82;lr. Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK18a5.75d0c4f5.0. Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118. Via: SIP/2.0/UDP 66.243.109.99:5060;branch=065c3d8f328ab962f47c763927c80fb3. To: 3212514273 sip:3212514273@66.243.109.99:5060. From: sip:7046639230@66.236.245.98;tag=73767738-B82. Call-ID: 8853950-3319472564-815436@66.243.109.99. CSeq: 1 INVITE. Max-Forwards: 3. Contact: sip:7046639230@66.243.109.99:5060. Record-Route: sip:216.229.127.60:5060;lr. Content-Type: application/sdp. Content-Length: 229. . v=0. o=NexTone-MSW 1234 8890 IN IP4 66.236.245.98. s=sip call. c=IN IP4 10.3.0.221. t=0 0. m=audio 36134 RTP/AVP 18 101. a=rtpmap:18 G729/8000. a=fmtp:18 annexb=no. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-16. a=ptime:20.