Hi, RFC 3581 (An Extension to SIP for Symmetric Response Routing - rport) says in section 4:
-------- RFC 3581 4. Server Behavior ... In fact, the server MUST insert a "received" parameter containing the source IP address that the request came from, even if it is identical to the value of the "sent-by" component. -------- But that's not true, a server or proxy MUST NOT add "received" parameter to "Via" if the real source IP is identical to the value of "sent-by": ------- RFC 3261 18.2 Servers 18.2.1 Receiving Requests When the server transport receives a request over any transport, it MUST examine the value of the "sent-by" parameter in the top Via header field value. If the host portion of the "sent-by" parameter contains a domain name, or if it contains an IP address that differs from the packet source address, the server MUST add a "received" parameter to that Via header field value. ------- I think is clear, isn't it? -- Iñaki Baz Castillo _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
