[MMUSIC] I-D ACTION:draft-ietf-mmusic-sdp-bwparam-05.txt

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This draft is a work item of the Multiparty Multimedia Session Control Working Group of the IETF.

	Title		: A Transport Independent Bandwidth Modifier for the 
			  Session Description Protocol (SDP)
	Author(s)	: M. Westerlund
	Filename	: draft-ietf-mmusic-sdp-bwparam-05.txt
	Pages		: 20
	Date		: 2003-10-30
	
The existing Session Description Protocol (SDP) bandwidth modifiers
and their values include the bandwidth needed also for the transport
and IP layers. When using SDP with protocols like the Session
Announcement Protocol (SAP), the Session Initiation Protocol (SIP)
and the Real-Time Streaming Protocol (RTSP) and when the involved
hosts reside in networks running different IP versions, the
interpretation of what lower layer bandwidths are included is not
clear. This document defines a bandwidth modifier that does not
include transport overhead; instead an additional packet rate
attribute is defined. The transport independent bit-rate value
together with the maximum packet rate can then be used to calculate
the real bit-rate over the transport actually used.

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