I-D ACTION:draft-ietf-avt-hc-mpls-reqs-01.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Audio/Video Transport Working Group of the IETF.

	Title		: Requirements for Header Compression over MPLS
	Author(s)	: J. Ash, et al.
	Filename	: draft-ietf-avt-hc-mpls-reqs-01.txt
	Pages		: 9
	Date		: 2004-6-4

VoIP typically uses the encapsulation voice/RTP/UDP/IP.  When MPLS 
labels are added, this becomes voice/RTP/UDP/IP/MPLS-labels, where, for 
example, the packet header is at least 48 bytes, while the voice payload 
is often no more than 30 bytes.  Header compression can significantly 
reduce the overhead through various compression mechanisms, such as 
enhanced compressed RTP (ECRTP) and robust header compression (ROHC). We 
consider using MPLS to route compressed packets over an MPLS LSP without 
compression/decompression cycles at each router.  This approach can 
increase the bandwidth efficiency as well as processing scalability of 
the maximum number of simultaneous flows that use header compression at 
each router.  In the draft we give a problem statement, goals and 
requirements, and an example scenario.

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