RFC 4588 - RTP Retransmission Payload Format

Authors: J. Rey, D. Leon, A. Miyazaki, V. Varsa, R. Hakenberg
Category: Standards Track
Published: July 2006

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

RTP retransmission is an effective packet loss recovery technique for real-time applications with relaxed delay bounds. This document describes an RTP payload format for performing retransmissions. Retransmitted RTP packets are sent in a separate stream from the original RTP stream. It is assumed that feedback from receivers to senders is available. In particular, it is assumed that Real-time Transport Control Protocol (RTCP) feedback as defined in the extended RTP profile for RTCP-based feedback (denoted RTP/AVPF) is available in this memo.

Contents

• 1. Introduction
• 2. Terminology
• 3. Requirements and Design Rationale for a Retransmission Scheme
  • 3.1. Multiplexing Scheme Choice
• 4. Retransmission Payload Format
• 5. Association of Retransmission and Original Streams
  • 5.1. Retransmission Session Sharing
  • 5.2. CNAME Use
  • 5.3. Association at the Receiver
• 6. Use with the Extended RTP Profile for RTCP-based Feedback
  • 6.1. RTCP at the Sender
  • 6.2. RTCP Receiver Reports
  • 6.3. Retransmission Requests
  • 6.4. Timing Rules
• 7. Congestion Control
• 8. Retransmission Payload Format MIME Type Registration
  • 8.1. Introduction
  • 8.2. Registration of audio/rtx
  • 8.3. Registration of video/rtx
  • 8.4. Registration of text/rtx
  • 8.5. Registration of application/rtx
  • 8.6. Mapping to SDP
  • 8.7. SDP Description with Session-Multiplexing
  • 8.8. SDP Description with SSRC-Multiplexing
• 9. RTSP Considerations
• 10. Implementation Examples
• 11. IANA Considerations
• 12. Security Considerations
• 13. Acknowledgements
• 14. References
• Appendix A. How to Control the Number of Rtxs. per Packet
• Authors' Addresses

See Also

RFC source: https://www.rfc-editor.org/info/rfc4588