RTP Payload Format for the iSAC Codec
draft-ietf-avt-rtp-isac-01

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Document Type Active Internet-Draft (payload WG)
Last updated 2012-04-17
Replaces draft-legrand-rtp-isac
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Network Working Group                                        T. le Grand
Internet-Draft                                                    Google
Intended status: Standards Track                                P. Jones
Expires: October 19, 2012                                       P. Huart
                                                           Cisco Systems
                                                      H. Alvestrand, Ed.
                                                                  Google
                                                          April 17, 2012

                 RTP Payload Format for the iSAC Codec
                       draft-ietf-avt-rtp-isac-01

Abstract

   iSAC is a proprietary wideband speech and audio codec developed by
   Global IP Solutions, suitable for use in Voice over IP applications.
   This document describes the payload format for iSAC generated bit
   streams within a Real-Time Protocol (RTP) packet.  Also included here
   are the necessary details for the use of iSAC with the Session
   Description Protocol (SDP).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [1].

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 October 19, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the

le Grand, et al.        Expires October 19, 2012                [Page 1]
Internet-Draft                    iSAC                        April 2012

   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  iSAC Codec Description  . . . . . . . . . . . . . . . . . . . . 3
   3.  RTP Payload Format  . . . . . . . . . . . . . . . . . . . . . . 4
     3.1.  iSAC Payload Format . . . . . . . . . . . . . . . . . . . . 4
     3.2.  Payload Header  . . . . . . . . . . . . . . . . . . . . . . 5
     3.3.  Encoded Speech Data . . . . . . . . . . . . . . . . . . . . 5
     3.4.  Multiple iSAC frames in an RTP packet . . . . . . . . . . . 6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
     4.1.  Media Type registration of iSAC . . . . . . . . . . . . . . 7
   5.  Mapping to SDP Parameters . . . . . . . . . . . . . . . . . . . 7
     5.1.  Example Initial Target Bit Rate . . . . . . . . . . . . . . 8
     5.2.  Example Max Bit Rate  . . . . . . . . . . . . . . . . . . . 8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 9
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 9
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

le Grand, et al.        Expires October 19, 2012                [Page 2]
Internet-Draft                    iSAC                        April 2012

1.  Introduction

   This document gives a general description of the iSAC wideband speech
   codec and specifies the iSAC payload format for usage in RTP packets.
   Also included here are the necessary details for the use of iSAC with
   the Session Description Protocol (SDP).

2.  iSAC Codec Description

   The iSAC codec is an adaptive wideband speech and audio codec that
   operates with short delay, making it suitable for high quality real
   time communication.  It is specially designed to deliver wideband
   speech quality in both low and medium bit rate applications.  It also
   handles non-speech audio well, such as music and background noise
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