Hi This is related to UAS behaviour to know "Where to send response for the received request". Following two statement looks a bit contradicting to me -
1. RFC 3261, Section 18.2.2 - The server transport uses the value of the top Via header field in order to determine where to send a response. Same section, last bullet - Otherwise, if it is not receiver-tagged, the response MUST be sent to the address indicated by the "sent-by" value, using the procedures in Section 5 of [4]. 2. RFC 3263 - A server, according to RFC 3261 [1], will send a response on the connection it arrived on (in the case of reliable transport protocols), and for unreliable transport protocols, to the source address of the request, and the port in the Via header field. As per RFC 3263, it seems like only port is used from Via header and source address is used. Although, I believe that Address and port both should be used from Via header and RFC 3261 also indicates the same. Does this statement from RFC 3263 applies to some special situations? My problem is following- Application receives an INVITE message from source IP address A with FQDN in Via header. FQDN is resolved through DNS A query and receives DNS reply where IP address B is mentioned at top and IP address A is mentioned after that. So, all the responses are sent to IP address B. Calling side keeps retransmitting the request from source address A and call does not go through. Is there anything which can be changed in application's behaviour? Thanks Kchitiz _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
