I-D ACTION:draft-donovan-mmusic-183-00.txt

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	Title		: SIP 183 Session Progress Message
	Author(s)	: S. Donovan, J. Hearty,  M. Cannon, H. Schulzrinne, 
 	                  J. Rosenberg 
        Filename	: draft-donovan-mmusic-183-00.txt
	Pages		: 17
	Date		: 22-Jun-99
	
This document describes a proposed extension of the Session Initia-
tion Protocol.  This extension would add the 183 Session Progress
response message.

The introduction of the 183 informational response message would
allow a called user agent to indicate to the calling user agent
whether or not the calling user agent should apply local alerting for
the session.  The existing 180 Ringing message would indicate that
the calling user agent has the option of providing local alerting
(and generally should).  The 183 Session Progress message would indi-
cate that the calling user agent should not provide local alerting
and should establish a media session to be used by the called user
agent to indicate the status of the session setup request as part of
the indicated media stream.

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