RE: [Sip-implementors] To tag in Register response

[Martien Huysmans]

Achuth   You can find the answer in, RfC3261, 8.2.6.2 Headers and Tags states    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).  This serves to identify the UAS that is    responding, possibly resulting in a component of a dialog ID.  The    same tag MUST be used for all responses to that request, both final    and provisional (again excepting the 100 (Trying)).   RFC3261, chapter 8.2 describes the general behavior for UAS and so it also applies for registrations as described in rfc3261, ch10.   Regards Martien -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]Namens Achuth Verzonden: Friday, March 15, 2002 8:47 AM Aan: [EMAIL PROTECTED] Onderwerp: [Sip-implementors] To tag in Register response Dear All,    I am sending a REGISTER request to one SIP server. The to and from fields, as usual are same, with the host part as the SIP server IP. Now, the server responds with 100 trying with same to and from value. It looks like the registrar is running at some other location (different IP). The server later responds with 200 OK, with same from. But the to field is diiferent, with the host part as the registrar IP address. I need to know whether this is a valid response. Is the client supposed to consider this as a valid 200 OK and process the same ? Can register responses contain different to field than that given in the request ?   Thanks in Advance !!!   Regards, Achuth.

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