Hi all,

bis-05 gives an algorithm on how to create and add a Record-Route header using
Contact or From header by a proxy (for allowing spirals).  Also given is the
modification of this header in the responses being forwarded upstream.   The
Record-Route header in the responses that was forwarded to the upstream comes
back to proxy in the form of Request-URI in ACK (and subsequent requests).

As per matching rules of requests to server transactions in section 17.2.3 the
ACK matches with the INVITE if Request-URI, From, Call-ID, CSeq method and top
Via header match those of the INVITE that created the
transaction.........................

Because of the way the Record-Route was formed using the Contact header of the
response the Request-URI of the ACK does not match with the INVITE's.

I apologize if it was already discussed.  Can somebody explain me what am I
missing ?

Thanks,
Krishna


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