SIP (Session Initiation Protocol) Usage of Offer/Answer Model

Document Type Replaced Internet-Draft (individual)
Last updated 2008-04-16 (latest revision 2006-06-12)
Replaced by draft-ietf-sipping-sip-offeranswer
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


SIP utilizes offer/answer model to establish and update multimedia sessions. The descriptions on how to use offer/answer in SIP are dispersed in the multiple RFCs. This document summarizes all the current usage of offer/answer model in SIP communication.


Takuya Sawada (
Paul Kyzivat (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)