Yes it is correct to have multiple Vias in a SIP Request. It indicates how many proxies the request has gone thru before reaching the final destination.
Actually as per RFC 3261, every proxy adds a Via header inserting its own address before forwarding the request further. This is explained in section 4 of RFC 3261. Regards Ranjit -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of padmaja venkata Sent: Friday, June 13, 2008 4:17 PM To: sip-implementors@lists.cs.columbia.edu Subject: [Sip-implementors] Proxy forwarding invite with multiple via headers Hi all, Is it OK if the proxy forwards the received invite with multiple via headers of its own inserted? For example: The received invite is this: INVITE sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]> SIP/2.0 Call-Id: [EMAIL PROTECTED] Contact: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>> Content-Length: 249 Content-Type: application/sdp Cseq: 1 INVITE From: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>>;tag=c0a832cd-17 Max-Forwards: 16 Min-Se: 600 Session-Expires: 3600 Session-Guid: 859321956-1634023014-905969664-2513471912 Supported: 100rel,timer To: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>> User-Agent: Quintum/1.0.0 SN/0030E12004B0 SW/P106-11-00 Via: SIP/2.0/UDP 192.168.50.205;branch=z9hG4bK-tenor-c0a8-32cd-0033 The proxy at 192.168.50.52 forwarded this as follows: INVITE sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]> SIP/2.0 Record-Route: <sip:192.168.50.52:5060 ;lr;sipXecs-rs=%2Afrom%7EYzBhODMyY2QtMTc%60.400_authrules%2Aauth%7E%2115 90e935cd4ae900a36d10202f501d7c> Call-Id: [EMAIL PROTECTED] Contact: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>> Content-Length: 249 Content-Type: application/sdp Cseq: 1 INVITE From: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>>;tag=c0a832cd-17 Max-Forwards: 16 Min-Se: 600 Session-Expires: 3600 Session-Guid: 859321956-1634023014-905969664-2513471912 Supported: 100rel,timer To: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>> User-Agent: Quintum/1.0.0 SN/0030E12004B0 SW/P106-11-00 Via: SIP/2.0/UDP 192.168.50.52 ;branch=z9hG4bK-sipXecs-0137aac61e5301ead76e6566cdb0f2d3be5e Via: SIP/2.0/UDP 192.168.50.52 ;branch=z9hG4bK-sipXecs-0134499c81a909946eaed847046c2535f409%e8c783cad7e e777c922618d09949ebd4 Via: SIP/2.0/UDP 192.168.50.52 ;branch=z9hG4bK-sipXecs-012ea2e73188173f014705446d987568ab32%dbb67e4f9a5 bca399689a4d127429e37 Via: SIP/2.0/UDP 192.168.50.205;branch=z9hG4bK-tenor-c0a8-32cd-0033 There are 3 via header fields inserted by proxy. Is this OK and in accordance with the RFC? Thanks, Padmaja _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
