Hi,
I have 2 IP phones (1 Cisco 7960 & another IP phone, say IP phone A) registered with fwd.pulver.com. When calling Cisco from IP phone A, I noticed that the INVITE which Cisco received that 2 equal Record-Route values. It probably is 'cause of the fact that the INVITE contained 2 VIA field values with same IP address but different branch parameters (see bolded text in 2nd INVITE below). I can't understand why the proxy (fwd.pulver.com) inserted 2 VIA header fields. Also, would there be any impact on routing if Record-Route has 2 identical field values? Any explanation for this behavior? Thanks in advance, Anshuman PS: 1. First INVITE message below is from IP phone A to proxy (fwd.pulver.com). Second INVITE is from proxy to Cisco. 2. When calling from Cisco to IP phone A, the proxy inserts only one VIA header, as I was expecting (INVITE message not pasted here). INVITE sip:[EMAIL PROTECTED] SIP/2.0 To: <sip:[EMAIL PROTECTED]> From: Staka <sip:[EMAIL PROTECTED]>;tag=200340ghj Call-ID: 210950h9! CSeq: 3 INVITE Via: SIP/2.0/UDP 172.25.21.217:5060;branch=z9hG4bK283970mxu;rport Allow: ACK,BYE,CANCEL,INVITE,INFO,NOTIFY,OPTIONS,PRACK,REFER,UPDATE Contact: sip:[EMAIL PROTECTED] Supported: 100rel,replaces,precondition Accept: application/sdp,application/cpim-pidf+xml Expires: 3600 User-Agent: Conexant-User-Agent Route: <sip:fwd.pulver.com:5060;lr> Accept-Language: en Content-Type: application/sdp Content-Length: 196 Content-Language: en Content-Disposition: session Max-Forwards: 70 v=0 o=731346 550 550 IN IP4 172.25.21.217 s=SIP Phone c=IN IP4 172.25.21.217 t=0 0 m=audio 5000 RTP/AVP 0 8 18 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=sendrecv INVITE sip:[EMAIL PROTECTED]:5060 SIP/2.0 Record-Route: <sip:[EMAIL PROTECTED];ftag=200340ghj;lr=on> Record-Route: <sip:[EMAIL PROTECTED];ftag=200340ghj;lr=on> To: <sip:[EMAIL PROTECTED]> From: Staka <sip:[EMAIL PROTECTED]>;tag=200340ghj Call-ID: 210950h9! CSeq: 3 INVITE Via: SIP/2.0/UDP 69.90.155.70;branch=z9hG4bK0ceb.85584e86.0 Via: SIP/2.0/UDP 69.90.155.70;branch=z9hG4bK0ceb.75584e86.0 Via: SIP/2.0/UDP 172.25.21.217:5060;branch=z9hG4bK283970mxu;rport=30719 Allow: ACK,BYE,CANCEL,INVITE,INFO,NOTIFY,OPTIONS,PRACK,REFER,UPDATE Contact: sip:[EMAIL PROTECTED]:5060 Supported: 100rel,replaces,precondition Accept: application/sdp,application/cpim-pidf+xml Expires: 3600 User-Agent: Conexant-User-Agent Accept-Language: en Content-Type: application/sdp Content-Length: 196 Content-Language: en Content-Disposition: session Max-Forwards: 68 v=0 o=731346 550 550 IN IP4 172.25.21.217 s=SIP Phone c=IN IP4 172.25.21.217 t=0 0 m=audio 5000 RTP/AVP 0 8 18 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=sendrecv Regards, Anshuman S. Rawat ********************** Legal Disclaimer **************************** "This email may contain confidential and privileged material for the sole use of the intended recipient. Any unauthorized review, use or distribution by others is strictly prohibited. If you have received the message in error, please advise the sender by reply email and delete the message. Thank you." ********************************************************************** _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
