A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Requirements for VoIP Header Compression over
Multiple-Hop Paths
Author(s) : J. Ash et al.
Filename : draft-ash-e2e-voip-hdr-comp-rqmts-01.txt
Pages : 0
Date : 2003-9-30
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. VoIP header compression can
significantly reduce the VoIP overhead through various compression
mechanisms. This is important on access links where bandwidth is
scarce, and can be important on backbone facilities, especially where
costs are high (e.g., some global cross-sections). Providing VoIP
header compression over multiple hop paths avoids multiple
compression/decompression cycles at each router, and thereby increases
the processing scalability of the maximum number of simultaneous VoIP
flows which use header compression at each router. This draft gives a
problem statement, example scenarios, goals, and requirements for VoIP
header compression from compressor to decompressor over multiple-hop
paths, possibly over MPLS. It also discusses work items and issues for
consideration, and highlights various solution alternatives that have
been proposed.
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