I-D ACTION:draft-ash-avt-ecrtp-over-mpls-protocol-00.txt

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	Title		: Protocol Extensions for ECRTP over MPLS
	Author(s)	: J. Ash
	Filename	: draft-ash-avt-ecrtp-over-mpls-protocol-00.txt
	Pages		: 0
	Date		: 2004-2-5
	
VoIP typically uses the encapsulation voice/RTP/UDP/IP. When MPLS labels 
are added, this becomes voice/RTP/UDP/IP/MPLS-labels. For an MPLS VPN, 
the packet header is at least 48 bytes, while the voice payload is often 
no more than 30 bytes, for example. VoIP header compression can 
significantly reduce the VoIP overhead through various compression 
mechanisms, such as enhanced compressed RTP (ECRTP). We consider using 
MPLS to route ECRTP compressed packets over an MPLS LSP without 
compression/decompression cycles at each router. Such an ECRTP over MPLS 
capability can increase the bandwidth efficiency as well as processing 
scalability of the maximum number of simultaneous VoIP flows that use 
header compression at each router.  In this draft we propose to use 
RSVP-TE extensions to signal the header compression context and other 
control messages between the ingress and egress LSR.  We re-use the 
methods in ECRTP to determine the context.

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