MIME Type Registration for RTP Payload Format for H.224
RFC 4573

 
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Type RFC - Proposed Standard (July 2006; No errata)
Last updated 2013-03-02
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IESG state RFC 4573 (Proposed Standard)
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Network Working Group                                            R. Even
Request for Comments: 4573                                   A. Lochbaum
Category: Standard Track                                         Polycom
                                                               July 2006

        MIME Type Registration for RTP Payload Format for H.224

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 Internet Society (2006).

Abstract

   In conversational video applications, far-end camera control protocol
   is used by participants to control the remote camera.  The protocol
   that is commonly used is ITU H.281 over H.224.  The document
   registers the H224 media type.  It defines the syntax and the
   semantics of the Session Description Protocol (SDP) parameters needed
   to support far-end camera control protocol using H.224.

Table of Contents

   1. Introduction ....................................................2
   2. Terminology .....................................................2
   3. Far-End Camera Control Protocol .................................2
   4. IANA Considerations .............................................2
      4.1. Media Type Registration ....................................2
   5. SDP Parameters ..................................................4
      5.1. Usage with the SDP Offer Answer Model ......................4
   6. Security Considerations .........................................5
   7. References ......................................................5
      7.1. Normative References .......................................5
      7.2. Informative References .....................................6

Even & Lochbaum              Standard Track                     [Page 1]
RFC 4573                          FECC                         July 2006

1.  Introduction

   The document registers the H224 media type, which may be used by
   systems that use SDP [RFC4566].

   This media type is used for supporting the simple far-end camera
   control protocol on SDP-based systems.  The media type helps
   signaling gateways between H.323 [ITU.H323] and SDP-based systems to
   use far-end camera control, end to end, without any protocol
   translation in the middle.

   The document defines the H224 media type since the RTP packets in
   H.323 annex Q [ITU.H323] carry H.224 frames [ITU.H224].  The far-end
   camera control protocol (FECC) is internal to the H.224 frame and is
   identified by the client ID field of the H.224 packet.

   The document will define the SDP [RFC4566] parameters needed to
   support the above far-end camera control protocol in systems that use
   SDP.

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 [RFC2119] and
   indicate requirement levels for compliant RTP implementations.

3.  Far-End Camera Control Protocol

   This simple protocol is based on ITU-T H.281[ITU.281] frames carried
   in ITU-T H.224 packets in an RTP/UDP channel.  H.323 annex Q
   specifies how to build the RTP packets from the H.224 packets.

   Using far end camera control protocol in point-to-point calls and
   multipoint calls for packet-switch networks is described in H.323,
   annex Q.

4.  IANA Considerations

4.1.  Media Type Registration

   This section describes the media types and names associated with this
   payload format.  The registration uses the templates defined in RFC
   4288 [RFC4288].  It follows RFC 3555 [RFC3555].

Even & Lochbaum              Standard Track                     [Page 2]
RFC 4573                          FECC                         July 2006

4.1.1.  Registration of MIME Media Type application/h224

   MIME media type name: application

   MIME subtype name: H224

   Required parameters: None

   Optional parameters: None

   Encoding considerations:

      This media type is framed (see H.323, Annex Q [ITU.H323]) and
      contains binary data; see Section 4.8 of [RFC4288]

   Security considerations: See Section 6 of RFC 4573.

   Interoperability considerations:
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