A New Internet-Draft is available from the on-line Internet-Drafts directories.
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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