RTP Profile for Audio and Video Conferences with Minimal Control

RFC	3551
Title	RTP Profile for Audio and Video Conferences with Minimal Control
Author	H. Schulzrinne, S. Casner
Status	Standards Track
Category	Packet Design
Obsoletes	1890
Date	July 2003

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 (2003). All Rights Reserved.

Abstract

This document describes a profile called "RTP/AVP" for the use of the real-time transport protocol (RTP), version 2, and the associated control protocol, RTCP, within audio and video from multiparticipant conferences with minimal control. It provides interpretations of generic fields within the RTP specification suitable for audio and video conferences. In particular, this document defines a set of default mappings from payload type numbers to encodings.

This document also describes how audio and video data may be carried within RTP. It defines a set of standard encodings and their names when used within RTP. The descriptions provide pointers to reference implementations and the detailed standards. This document is meant as an aid for implementors of audio, video and other real-time multimedia applications.

This memorandum obsoletes RFC 1890. It is mostly backwards-compatible except for functions removed because two interoperable implementations were not found. The additions to RFC 1890 codify existing practice in the use of payload formats under this profile and include new payload formats defined since RFC 1890 was published.

Table of Contents

• 1. Introduction
  • 1.1 Terminology
• 2. RTP and RTCP Packet Forms and Protocol Behavior
• 3. Registering Additional Encodings
• 4. Audio
  • 4.1 Encoding-Independent Rules
  • 4.2 Operating Recommendations
  • 4.3 Guidelines for Sample-Based Audio Encodings
  • 4.4 Guidelines for Frame-Based Audio Encodings
  • 4.5 Audio Encodings
    • 4.5.1 DVI4
    • 4.5.2 G722
    • 4.5.3 G723
    • 4.5.4 G726-40, G726-32, G726-24, and G726-16
    • 4.5.5 G728
    • 4.5.6 G729
    • 4.5.7 G729D and G729E
    • 4.5.8 GSM
    • 4.5.9 GSM-EFR
    • 4.5.10 L8
    • 4.5.11 L16
    • 4.5.12 LPC
    • 4.5.13 MPA
    • 4.5.14 PCMA and PCMU
    • 4.5.15 QCELP
    • 4.5.16 RED
    • 4.5.17 VDVI
• 5. Video
  • 5.1 CelB
  • 5.2 JPEG
  • 5.3 H261
  • 5.4 H263
  • 5.5 H263-1998
  • 5.6 MPV
  • 5.7 MP2T
  • 5.8 nv
• 6. Payload Type Definitions
• 7. RTP over TCP and Similar Byte Stream Protocols
• 8. Port Assignment
• 9. Changes from RFC 1890
• 10. Security Considerations
• 11. IANA Considerations
• 12. References
  • 12.1 Normative References
  • 12.2 Informative References
• 13. Current Locations of Related Resources
• 14. Acknowledgments
• 15. Intellectual Property Rights Statement
• 16. Authors' Addresses
• 17. Full Copyright Statement