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List:       sip-implementors
Subject:    [Sip-implementors] Clarification about REGISTER call-flow
From:       vganapathy () hss ! hns ! com
Date:       2003-02-25 6:19:40
Message-ID: 65256CD8.0021A989.00 () sampark ! hss ! hns ! com
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Hi,

In the draft-ietf-sipping-basic-call-flows-01.txt
the section "2.1 Successful New Registration"
shows the call-flow for a successful registration
after a challenge cycle between the registrar and
the UA. In the re-tried REGISTER message the CSeq
has been incremented and the same call-id is used.
But the From-Tag has been changed. Should the From
tag be different in all the resubmitted requests.
If so section "3.2 Session Establishment Through
Two Proxies"  shows the resubmitting of INVITE
request after a 407. There the from tag has been
retained. Is the behaviour for REGISTER request
a special case or its a typo.

In short, in a resubmitted request after a challenge
should the From Tag be the same as the original
request. SIP Rfc is clear on incrementing CSeq but
not about re-using the From tag. It will be of help
if somebody can clarify or provide any poniters.


Thnx & Regards,
- Vijay






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