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RTP: A Transport Protocol for Real-Time Applications (RFC1889)

IP.com Disclosure Number: IPCOM000004144D
Original Publication Date: 1996-Jan-01
Included in the Prior Art Database: 2019-Feb-12

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Audio-Video Transport Working Group: AUTHOR [+4]

Related Documents

10.17487/RFC1889: DOI

Abstract

This memorandum describes RTP, the real-time transport protocol. RTP provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 2% of the total text.

Network Working Group Audio-Video Transport Working Group Request for Comments: 1889 H. Schulzrinne Category: Standards Track GMD Fokus S. Casner Precept Software, Inc. R. Frederick Xerox Palo Alto Research Center V. Jacobson Lawrence Berkeley National Laboratory January 1996

RTP: A Transport Protocol for Real-Time Applications

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.

Abstract

This memorandum describes RTP, the real-time transport protocol. RTP provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. RTP does not address resource reservation and does not guarantee quality-of- service for real-time services. The data transport is augmented by a control protocol (RTCP) to allow monitoring of the data delivery in a manner scalable to large multicast networks, and to provide minimal control and identification functionality. RTP and RTCP are designed to be independent of the underlying transport and network layers. The protocol supports the use of RTP-level translators and mixers.

Table of Contents

1. Introduction ........................................ 3 2. RTP Use Scenarios ................................... 5 2.1 Simple Multicast Audio Conference ................... 5 2.2 Audio and Video Conference .......................... 6 2.3 Mixers and Translators .............................. 6 3. Definitions ......................................... 7 4. Byte Order, Alignment, and Time Format .............. 9 5. RTP Data Transfer Protocol .......................... 10 5.1 RTP Fixed Header Fields ............................. 10 5.2 Multiplexing RTP Sessions ........................... 13

Schulzrinne, et al Standards Track [Page 1]

RFC 1889 RTP January 1996

5.3 Profile-Specific Modifications to the RTP Header..... 14 5.3.1 RTP Header Extension ................................ 14 6. RTP Control Protocol -- RTCP ........................ 15 6.1 RTCP Packet Format .................................. 17 6.2 RTCP Transmission Interval .......................... 19 6.2.1 Maintaining the number of session members ........... 21 6.2.2 Allocation of source description bandwidth .......... 21 6.3 Sender and Receiver Reports ......................... 22 6.3.1 SR: Sender report RTCP packet ....................... 23 6.3.2 RR: Receiver report RTCP packet ..................... 28 6.3.3 Extending the sender and receiver reports ........... 29 6.3.4 Analyzing sender and receiver reports ............... 29 6.4 SDES: Source description RTCP packet ................ 31 6.4.1 CNAME: Canonical end-point identifier SDES item ..... 32 6.4....

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