> I would like to know the What is difference between two > Register(1 and 3) ..Why Cseq is difference even though >there is no change in Call_ID.? > > Why 2nd Register does not contain the to- tag, where is > the both the Register Request contain same call id
See RFC 3261 section 8.1.3.5. "If a 401 (Unauthorized) or 407 (Proxy Authentication Required) response is received, the UAC SHOULD follow the authorization procedures of Section 22.2 and Section 22.3 to retry the request with credentials." "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." And for completeness... an RFC 3261 compliant device will include a different Via branch value within the new request. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
