Enhancements to RTP Payload Formats for EVRC Family Codecs
RFC 4788

Approval announcement
Draft of message to be sent after approval:

From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
Cc: Internet Architecture Board <iab@iab.org>,
    RFC Editor <rfc-editor@rfc-editor.org>, 
    avt mailing list <avt@ietf.org>, 
    avt chair <avt-chairs@tools.ietf.org>
Subject: Protocol Action: 'Enhancements to RTP Payload Formats 
         for EVRC Family Codecs' to Proposed Standard 

The IESG has approved the following document:

- 'Enhancements to RTP Payload Formats for EVRC Family Codecs '
   <draft-ietf-avt-compact-bundled-evrc-12.txt> as a Proposed Standard

This document is the product of the Audio/Video Transport Working Group. 

The IESG contact persons are Cullen Jennings and Jon Peterson.

A URL of this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-avt-compact-bundled-evrc-12.txt

* Technical Summary

This document updates the EVRC RTP payload formats defined in RFC
3558 with several enhancements and extensions. In particular, it
defines support for the header-free and interleaved/bundled packet
formats for the EVRC-B codec, a new compact bundled format for the
EVRC and EVRC-B codecs, as well as discontinuous transmission (DTX)
support for EVRC and EVRC-B encoded speech transported via RTP. 
VoIP applications operating over low bandwidth dial-up and wireless
networks require such enhancements for efficient use of the
bandwidth.

* Working Group Summary

A straight-forward RTP Payload Format, to address a new version of 
the codec. Only unusual feature is the tight specification of the DTX 
parameters, rather than relying on end-point discretion (as is the 
norm).

* Protocol Quality

This drafts was reviewed on the ietf-types list in May 2006; there 
were no objections. Adam Li provided working group last call comments 
on DTX operation. Colin Perkins did the PROTO write-up. David Black did
Gen ART Review.