I-D ACTION:draft-ietf-mmusic-sdp-bwparam-02.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-02.txt
	Pages		: 17
	Date		: 2003-5-14
	
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 in protocols like Session Announcement
Protocol (SAP), Session Initiation Protocol (SIP) and Real-Time
Streaming Protocol (RTSP) and the involved hosts reside in networks
running different IP versions, the interpretation of what lower layer
bandwidths are included is not clear. This documents 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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