The from-tag SHOULD be the same. The example in RFC 3665, which is not 'normative' (its just examples, not a protocol specification), is not correct.
According to RFC 3261 section 8.1.3.5 (Processing 4xx Responses): In all of the above cases, the request is retried by creating a new request with the appropriate modifications. This new request constitutes a new transaction and SHOULD have the same value of the Call-ID, To, and From of the previous request, but the CSeq should contain a new sequence number that is one higher than the previous. The 'value' of the From includes the tag. cheers, (-:bob Robert F. Penfield Chief Software Architect Acme Packet, Inc. 71 Third Avenue Burlington, MA 01803 [EMAIL PROTECTED] ----- Original Message ----- From: "rahul" <[EMAIL PROTECTED]> To: "Szilagyi, Mike" <[EMAIL PROTECTED]>; <[email protected]> Sent: Monday, May 22, 2006 6:58 AM Subject: Re: [Sip-implementors] From-tag on Registration attempt > Hi, > > As per rfc 3665 2.1 From Tag and Via branch parameter > will be different form the first REGISTER Message. > > Regards, > Ravi >> >> ----- Original Message ----- >> From: "Szilagyi, Mike" <[EMAIL PROTECTED]> >> To: <[email protected]> >> Sent: Thursday, May 18, 2006 7:11 PM >> Subject: [Sip-implementors] From-tag on Registration >> attempt >> >> >> > When a UAS or proxy challenges a REGISTER request, >> should the UAC use >> > the From-tag from the original request in the >> second REGISTER attempt. >> > >> > RFC3261 says it should have the same From header >> but does not explicitly >> > mention the tag value. >> > >> > Regards. >> > _______________________________________________ >> > Sip-implementors mailing list >> > [email protected] >> > >> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > >> >> _______________________________________________ >> Sip-implementors mailing list >> [email protected] >> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
