Please see sec. 2.2 of draft-ietf-sipping-sip-offeranswer-04.txt
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Sent: Thursday, December 20, 2007 3:16 PM
To: [email protected]; [EMAIL PROTECTED]
Subject: [Sip] PRACK/Offer Answer
Hi,
I have a call scenario, where UAC had sent an offer (not
initial) in PRACK and the UAS needs to refuse the offer. Can the UAS
refuse the offer using a 4xx response (e.g. 488) ? I don't find any
specific example in the currently available RFCs and/or drafts.
Cheers,
Subhodeep
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