| Abstract
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This document defines a mechanism by which two entities can make use
of the Session Description Protocol (SDP) to arrive at a common view
of a multimedia session between them. In the model, one participant
offers the other a description of the desired session from their
perspective, and the other participant answers with the desired
session from their perspective. This offer/answer model is most
useful in unicast sessions where information from both participants
is needed for the complete view of the session. The offer/answer
model is used by protocols like the Session Initiation Protocol
(SIP).
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