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Enhancements to RTP Payload Formats for EVRC Family Codecs (RFC4788)

IP.com Disclosure Number: IPCOM000145231D
Original Publication Date: 2007-Jan-01
Included in the Prior Art Database: 2007-Jan-11
Document File: 23 page(s) / 42K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Q. Xie: AUTHOR [+2]

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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Network Working Group                                             Q. Xie Request for Comments: 4788                                      Motorola Updates: 3558                                                  R. Kapoor Category: Standards Track                                       Qualcomm                                                             January 2007

        Enhancements to RTP Payload Formats for EVRC Family Codecs

Status of This Memo

   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.

Xie & Kapoor                Standards Track                     [Page 1]
 RFC 4788              EVRC RTP Format Enhancements          January 2007

 Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3

     1.1.  Support of EVRC-B Codec  . . . . . . . . . . . . . . . . .  3

     1.2.  Compact (Header-free) Bundled Format . . . . . . . . . . .  3

     1.3.  Discontinuous Transmission (DTX) . . . . . . . . . . . . .  4

   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  5

   3.  EVRC-B Codec . . . . . . . . . . . . . . . . . . . . . . . . .  5

   4.  Compact Bundled Format . . . . . . . . . . . . . . . . . . . .  5

     4.1.  Single-Rate Operation  . . . . . . . . . . . . . . . . . .  5

   5.  Storage Format for EVRC-B Codec  . . . . . . . . . . . . . . .  6

   6.  Media Type Definitions . . . . . . . . . . . . . . . . . . . .  6

     6.1.  Registration of Media Type EVRC1 . . . . . . . . . . . . .  6

     6.2.  Registration of Media Type EVRCB . . . . . . . . . . . . .  9

     6.3.  Re...