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Title : Early Media in SIP: Problem Statement, Requirements, and Analysis of Solutions
Author(s) : R. Barnes, M. Lepinski
Filename : draft-barnes-sip-em-ps-req-sol-00.txt
Pages : 14
Date : 2007-2-8
The Session Initiation Protocol (SIP) enables and permits endpoints
in an INVITE transaction to send media packets before an SDP offer/
answer exchange has completed; we refer to such media packets as
early media. The use of early media is common in current SIP
implementations, and causes several problems, which have been
documented elsewhere. This document puts forward the goal of
modifying SIP so that compliant implementations will complete an SDP
exchange before sending media, and lays out high-level requirements
for such a solution. The set of possible solutions is then laid out,
and each possibility examined in light of these requirements.
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