RFC - 4788

Enhancements to RTP Payload Formats for EVRC Family Codecs

Original:	ftp://ftp.isi.edu/in-notes/rfc4788.txt
Authors:	Q. Xie [Motorola], R. Kapoor [Qualcomm]
Date:	January 2007
Category:	Proposed Standard

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Updates:
RFC-3558prop	RTP Payload Format for Enhanced Variable Rate Codecs (EVRC) and Selectable Mode Vocoders (SMV) (Updated by RFC-4788prop)

Referred by:	1 RFC
Refers to:	8 RFC

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Status

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The IETF Trust (2007).

Abstract

This document updates the Enhanced Variable Rate Codec (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. Voice over IP (VoIP) applications operating over low bandwidth dial-up and wireless networks require such enhancements for efficient use of the bandwidth.

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