The following is a SIP message sequence between two phones and a proxy sitting between them The Calling phone (201) is on IP 192.168.254.2 The called phone (200) is on 192.168.254.1 The proxy is on 192.168.254.254
The phone rings and the caller gets ring tone, and ring tone stops when its answered but the media session fails to establish, which I think is a problem with the ACK. I think the ACK is being discarded by the called phone. I would be most grateful for any pointers as to what is wrong here. Thanks Andrew Received INVITE: INVITE sip:[email protected];user=phone SIP/2.0 Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKa87d4e3a87ca634d Contact: <sip:[email protected]:5060;user=phone;transport=udp> To: <sip:[email protected];user=phone> From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 2 INVITE Expires: 300 Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE Content-Type: application/sdp Proxy-Authorization: Digest username="userB",realm="",nonce="1233492477:9a4d30a056a8b4aa2afebadffc50aea0",uri="sip:[email protected]",response="37f53e5aff3c049f7564ef00635c6090",qop=auth-int,nc=00000001,cnonce="bf41afbb" Supported: replaces, 100rel User-Agent: Cisco-CP7912/8.0.0-060111A Content-Length: 288 v=0 o=201 805339182 805339182 IN IP4 192.168.254.2 s=Cisco 7912 SIP Call c=IN IP4 192.168.254.2 t=0 0 m=audio 16384 RTP/AVP 0 18 8 101 a=rtpmap:0 PCMU/8000/1 a=rtpmap:18 G729/8000/1 a=fmtp:18 annexb=yes a=rtpmap:8 PCMA/8000/1 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 Forwarded INVITE: INVITE sip:[email protected]:5060;user=phone;transport=UDP SIP/2.0 Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKa87d4e3a87ca634d Max-Forwards: 70 Contact: <sip:[email protected]:5060> To: <sip:[email protected]:5060;user=phone;transport=UDP> From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 1 INVITE Content-Type: application/sdp Content-Length: 288 v=0 o=201 805339182 805339182 IN IP4 192.168.254.2 s=Cisco 7912 SIP Call c=IN IP4 192.168.254.2 t=0 0 m=audio 16384 RTP/AVP 0 18 8 101 a=rtpmap:0 PCMU/8000/1 a=rtpmap:18 G729/8000/1 a=fmtp:18 annexb=yes a=rtpmap:8 PCMA/8000/1 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 Recieved 180: SIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKa87d4e3a87ca634d Contact: <sip:[email protected]:5060;user=phone;transport=udp> To: <sip:[email protected]:5060;user=phone;transport=UDP>;tag=2081843699 From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 1 INVITE Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE Server: Cisco-CP7912/8.0.0-060111A Content-Length: 0 Forwarded 180: SIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKa87d4e3a87ca634d Contact: <sip:[email protected]:5060;user=phone;transport=udp> To: <sip:[email protected];user=phone>;tag=2081843699 From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 2 INVITE Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE Server: Cisco-CP7912/8.0.0-060111A Content-Length: 0 Recieved 200: SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKa87d4e3a87ca634d Contact: <sip:[email protected]:5060;user=phone;transport=udp> To: <sip:[email protected]:5060;user=phone;transport=UDP>;tag=2081843699 From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 1 INVITE Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE Content-Type: application/sdp Server: Cisco-CP7912/8.0.0-060111A Supported: replaces Content-Length: 210 v=0 o=200 42059188 42059188 IN IP4 192.168.254.1 s=Cisco 7912 SIP Call c=IN IP4 192.168.254.1 t=0 0 m=audio 16384 RTP/AVP 0 101 a=rtpmap:0 PCMU/8000/1 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 Forwarded 200: SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKa87d4e3a87ca634d Contact: <sip:> To: <sip:[email protected];user=phone>;tag=2081843699 From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 2 INVITE Content-Type: application/sdp Content-Length: 210 v=0 o=200 42059188 42059188 IN IP4 192.168.254.1 s=Cisco 7912 SIP Call c=IN IP4 192.168.254.1 t=0 0 m=audio 16384 RTP/AVP 0 101 a=rtpmap:0 PCMU/8000/1 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 setting tcsid = 379 Received ACK : ACK sip:192.168.254.254 SIP/2.0 Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKf5d124862f8aad9a To: <sip:[email protected];user=phone>;tag=2081843699 From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 2 ACK Proxy-Authorization: Digest username="userB",realm="",nonce="1233492477:9a4d30a056a8b4aa2afebadffc50aea0",uri="sip:[email protected]",response="37f53e5aff3c049f7564ef00635c6090",qop=auth-int,nc=00000001,cnonce="bf41afbb" User-Agent: Cisco-CP7912/8.0.0-060111A Content-Length: 0 Forwarded ACK: ACK sip:[email protected];user=phone SIP/2.0 Via: SIP/2.0/UDP 192.168.254.2:5060;branch=z9hG4bKf5d124862f8aad9a To: <sip:[email protected];user=phone>;tag=2081843699 From: <sip:[email protected];user=phone>;tag=3440312132 Call-ID: [email protected] CSeq: 2 ACK Proxy-Authorization: Digest username="userB",realm="",nonce="1233492477:9a4d30a056a8b4aa2afebadffc50aea0",uri="sip:[email protected]",response="37f53e5aff3c049f7564ef00635c6090",qop=auth-int,nc=00000001,cnonce="bf41afbb" User-Agent: Cisco-CP7912/8.0.0-060111A Content-Length: 0 _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
