On Thu, 2005-10-27 at 17:54 +0530, Panchanan Nayak wrote: > I have a scenario in which UAS receives an INVITE and then sends 180 without > TO tag followed by 200 OK with TO tag. > > Is this valid according to standards.
That's easy: Search for "100" in RFC 3261: 8.2.6.2 Headers and Tags [...] If a request contained a To tag in the request, the To header field in the response MUST equal that of the request. However, if the To header field in the request did not contain a tag, the URI in the To header field in the response MUST equal the URI in the To header field; additionally, the UAS MUST add a tag to the To header field in the response (with the exception of the 100 (Trying) response, in which a tag MAY be present). [...] Dale _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
