RTP Payload Format for Global System for Mobile Communications Half Rate (GSM-HR)
RFC 5993

Document Type RFC - Proposed Standard (October 2010; No errata)
Last updated 2013-03-02
Replaces draft-wang-avt-rtp-gsm-hr, draft-westerlund-avt-rtp-gsm-hr, draft-rocky-avt-rtp-gsm-hr
Stream IETF
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Stream WG state (None)
Consensus Unknown
Document shepherd No shepherd assigned
IESG IESG state RFC 5993 (Proposed Standard)
Telechat date
Responsible AD Robert Sparks
Send notices to avt-chairs@ietf.org, draft-ietf-avt-rtp-gsm-hr@ietf.org, tom111.taylor@bell.net
Internet Engineering Task Force (IETF)                           X. Duan
Request for Comments: 5993                                       S. Wang
Category: Standards Track        China Mobile Communications Corporation
ISSN: 2070-1721                                            M. Westerlund
                                                              K. Hellwig
                                                            I. Johansson
                                                             Ericsson AB
                                                            October 2010

                         RTP Payload Format for
       Global System for Mobile Communications Half Rate (GSM-HR)

Abstract

   This document specifies the payload format for packetization of
   Global System for Mobile Communications Half Rate (GSM-HR) speech
   codec data into the Real-time Transport Protocol (RTP).  The payload
   format supports transmission of multiple frames per payload and
   packet loss robustness methods using redundancy.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5993.

Duan, et al.                 Standards Track                    [Page 1]
RFC 5993              RTP Payload Format for GSM-HR         October 2010

Copyright Notice

   Copyright (c) 2010 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
   3.  GSM Half Rate  . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  Payload Format Capabilities  . . . . . . . . . . . . . . . . .  4
     4.1.  Use of Forward Error Correction (FEC)  . . . . . . . . . .  4
   5.  Payload Format . . . . . . . . . . . . . . . . . . . . . . . .  5
     5.1.  RTP Header Usage . . . . . . . . . . . . . . . . . . . . .  6
     5.2.  Payload Structure  . . . . . . . . . . . . . . . . . . . .  6
       5.2.1.  Encoding of Speech Frames  . . . . . . . . . . . . . .  8
       5.2.2.  Encoding of Silence Description Frames . . . . . . . .  8
     5.3.  Implementation Considerations  . . . . . . . . . . . . . .  8
       5.3.1.  Transmission of SID Frames . . . . . . . . . . . . . .  8
       5.3.2.  Receiving Redundant Frames . . . . . . . . . . . . . .  8
       5.3.3.  Decoding Validation  . . . . . . . . . . . . . . . . .  9
   6.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     6.1.  3 Frames . . . . . . . . . . . . . . . . . . . . . . . . . 10
     6.2.  3 Frames with Lost Frame in the Middle . . . . . . . . . . 11
   7.  Payload Format Parameters  . . . . . . . . . . . . . . . . . . 11
     7.1.  Media Type Definition  . . . . . . . . . . . . . . . . . . 12
     7.2.  Mapping to SDP . . . . . . . . . . . . . . . . . . . . . . 13
       7.2.1.  Offer/Answer Considerations  . . . . . . . . . . . . . 14
       7.2.2.  Declarative SDP Considerations . . . . . . . . . . . . 14
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
   9.  Congestion Control . . . . . . . . . . . . . . . . . . . . . . 15
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 15
   11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 16
     12.2. Informative References . . . . . . . . . . . . . . . . . . 17

Duan, et al.                 Standards Track                    [Page 2]
RFC 5993              RTP Payload Format for GSM-HR         October 2010

1.  Introduction
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