RTP payload format for Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)
draft-ietf-avt-rtp-evrc-nw-09

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Document Type Active Internet-Draft (payload WG)
Author Zheng Fang 
Last updated 2012-12-20 (latest revision 2012-12-13)
Replaces draft-zfang-avt-rtp-evrc-nw
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Send notices to payload-chairs@tools.ietf.org, draft-ietf-avt-rtp-evrc-nw@tools.ietf.org
Network Working Group                                            Z. Fang
Internet-Draft                                     Qualcomm Incorporated
Intended status: Standards Track                       December 13, 2012
Expires: June 16, 2013

RTP payload format for Enhanced Variable Rate Narrowband-Wideband Codec
                               (EVRC-NW)
                     draft-ietf-avt-rtp-evrc-nw-09

Abstract

   This document specifies real-time transport protocol (RTP) payload
   formats to be used for the Enhanced Variable Rate Narrowband-Wideband
   Codec (EVRC-NW).  Three media type registrations are included for
   EVRC-NW RTP payload formats.  In addition, a file format is specified
   for transport of EVRC-NW speech data in storage mode applications
   such as e-mail.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on June 16, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   publication of this document.  Please review these documents
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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  EVRC-NW codec  . . . . . . . . . . . . . . . . . . . . . . . .  6
   5.  RTP header usage . . . . . . . . . . . . . . . . . . . . . . .  7
   6.  Payload format . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.1.  Encoding capability identification in EVRC-NW
           interleaved/bundled format . . . . . . . . . . . . . . . .  8
   7.  Congestion Control Considerations  . . . . . . . . . . . . . . 11
   8.  Storage format for the EVRC-NW Codec . . . . . . . . . . . . . 12
   9.  IANA considerations  . . . . . . . . . . . . . . . . . . . . . 13
     9.1.  Media Type Registrations . . . . . . . . . . . . . . . . . 13
       9.1.1.  Registration of Media Type audio/EVRCNW  . . . . . . . 13
       9.1.2.  Registration of Media Type audio/EVRCNW0 . . . . . . . 15
       9.1.3.  Registration of Media Type audio/EVRCNW1 . . . . . . . 16
   10. SDP mode attributes for EVRC-NW  . . . . . . . . . . . . . . . 19
   11. Mode Change Request/Response Considerations  . . . . . . . . . 20
   12. Mapping EVRC-NW media type parameters into SDP . . . . . . . . 22
   13. Offer-Answer Model Considerations for EVRC-NW  . . . . . . . . 23
   14. Declarative SDP Considerations . . . . . . . . . . . . . . . . 25
   15. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
   16. Security Considerations  . . . . . . . . . . . . . . . . . . . 29
   17. References . . . . . . . . . . . . . . . . . . . . . . . . . . 30
     17.1. Normative References . . . . . . . . . . . . . . . . . . . 30
     17.2. Informative References . . . . . . . . . . . . . . . . . . 31
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 32

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1.  Introduction

   This document specifies the payload formats for packetization of
   EVRC-NW encoded speech signals into the real-time transport protocol
   (RTP).  It defines support for the header-free, interleaved/bundled,
   and compact bundle packet formats for the EVRC-NW codec as well as
   discontinuous transmission (DTX) support for EVRC-NW encoded speech
   transported via RTP.  The EVRC-NW codec offers better speech quality
   than the EVRC and EVRC-B codecs and better capacity than EVRC-WB
   codec.  EVRC-NW belongs to the EVRC family of codecs.
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