I think "received" was introduced so that response reach the sip-node that sent the request. It has nothing to do with NAT as 3261 never considered and address this problem. So, if the top most Via contains non-ip sent-by, the UAS is supposed to replace it with the IP address from where it has received the request so that while sending response, it need not perform dns procedures which may resolve sent-by to some other IP address which is different from the UAC one.
On Wed, Apr 9, 2008 at 4:14 AM, Iñaki Baz Castillo <[EMAIL PROTECTED]> wrote: > Hi, I can't imagine why "rport" is an extension (RFC 3581) to SIP instead of > being included directly in RFC 3261. > > Ok, I know that in RFC 3261 NAT doesn't exist (I imagine IETF meetings using > a > private LAN with IPv6 XDDD) but even if NAT wasn't exist I can't imagine an > scenario where the source IP changes but not the port. Any example please? > > Thanks a lot. > > -- > Iñaki Baz Castillo > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
