I am not 100% sure but I think the additional parameters are added
to distinguish spirals from retransmit requests.
thanks
Rajat Ghai
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 19, 2001 1:51 PM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] Determination of retransmitted request
Hi,
I have a question on determination of a retransmitted request.
According to rfc2543-bis-02, Section 11.5, Item 2, a request received is a
retransmitted request if Call-ID, From, To and CSeq values exactly match.
According to rfc2543-bis-03, Section 15.5, Item 3, a request received is a
retransmitted request if Call-ID, From, To, CSeq, Request-URI, and
branch-ID in the topmost Via exactly match.
I'd like to understand reasons as to why we needed to add two additional
fields to identify a retransmitted request. I think it may be related to
the support of redirect capability or forking proxy, but i am not sure.
This probably has been discussed many times before; but i haven't followed
much and i'd appreciate any help anyone can provide.
Thanks,
YoungSun
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