A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Protocol Extensions for ECRTP over MPLS
Author(s) : J. Ash, et al.
Filename : draft-ash-avt-ecrtp-over-mpls-protocol-02.txt
Pages : 10
Date : 2004-12-27
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. Header compression can significantly
reduce the 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 compressed 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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