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Update to Remove DVI4 from the Recommended Codecs for the RTP Profile for Audio and Video Conferences with Minimal Control (RTP/AVP)
RFC 7007

Internet Engineering Task Force (IETF)                     T. Terriberry
Request for Comments: 7007                           Mozilla Corporation
Updates: 3551                                                August 2013
Category: Standards Track
ISSN: 2070-1721

 Update to Remove DVI4 from the Recommended Codecs for the RTP Profile
     for Audio and Video Conferences with Minimal Control (RTP/AVP)

Abstract

   The RTP Profile for Audio and Video Conferences with Minimal Control
   (RTP/AVP) is the basis for many other profiles, such as the Secure
   Real-time Transport Protocol (RTP/SAVP), the Extended RTP Profile for
   Real-time Transport Control Protocol (RTCP)-Based Feedback
   (RTP/AVPF), and the Extended Secure RTP Profile for RTCP-Based
   Feedback (RTP/SAVPF).  This document updates RFC 3551, the RTP/AVP
   profile (and by extension, the profiles that build upon it), to
   reflect changes in audio codec usage since that document was
   originally published.

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/rfc7007.

Terriberry                   Standards Track                    [Page 1]
RFC 7007                     RTP/AVP Codecs                  August 2013

Copyright Notice

   Copyright (c) 2013 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 ....................................................2
   2. Terminology .....................................................2
   3. Updates to RFC 3551 .............................................3
      3.1. Updates to Section 6 of RFC 3551 ...........................3
   4. Security Considerations .........................................3
   5. Acknowledgments .................................................3
   6. References ......................................................4
      6.1. Normative References .......................................4
      6.2. Informative References .....................................4

1.  Introduction

   [RFC3551] says that audio applications operating under the RTP/AVP
   profile SHOULD be able to send and receive PCMU and DVI4.  However,
   in practice, many RTP deployments do not support DVI4, and there is
   little reason to use it when much more modern codecs are available.
   This document updates the recommended audio codec selection for the
   RTP/AVP profile and removes the SHOULD for DVI4.  By extension, this
   also updates the profiles that build on RTP/AVP, including RTP/SAVP
   [RFC3711], RTP/AVPF [RFC4585], and RTP/SAVPF [RFC5124].

2.  Terminology

   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 [RFC2119].

Terriberry                   Standards Track                    [Page 2]
RFC 7007                     RTP/AVP Codecs                  August 2013

3.  Updates to RFC 3551

   The following text of [RFC3551] is hereby updated as set forth in
   Section 3.1:

      Audio applications operating under this profile SHOULD, at a
      minimum, be able to send and/or receive payload types 0 (PCMU)
      and 5 (DVI4).  This allows interoperability without format
      negotiation and ensures successful negotiation with a conference
      control protocol.

3.1.  Updates to Section 6 of RFC 3551

   This document updates the final paragraph of Section 6 of RFC 3551 by
   replacing "payload types 0 (PCMU) and 5 (DVI4)" with "payload

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