Network Working Group M. Handley
Request for Comments: 4566 UCL
Obsoletes: 2327, 3266 V. Jacobson
Category: Standards Track Packet Design
C. Perkins
University of Glasgow
July 2006
SDP: Session Description Protocol
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
This memo defines the Session Description Protocol (SDP). SDP is
intended for describing multimedia sessions for the purposes of
session announcement, session invitation, and other forms of
multimedia session initiation.
Table of Contents
1. Introduction ....................................................3
2. Glossary of Terms ...............................................3
3. Examples of SDP Usage ...........................................4
3.1. Session Initiation .........................................4
3.2. Streaming Media ............................................4
3.3. Email and the World Wide Web ...............................4
3.4. Multicast Session Announcement .............................4
4. Requirements and Recommendations ................................5
4.1. Media and Transport Information ............................6
4.2. Timing Information .........................................6
4.3. Private Sessions ...........................................7
4.4. Obtaining Further Information about a Session ..............7
4.5. Categorisation .............................................7
4.6. Internationalisation .......................................7
Handley, et al. Standards Track [Page 1]
RFC 4566 SDP July 2006
5. SDP Specification ...............................................7
5.1. Protocol Version ("v=") ...................................10
5.2. Origin ("o=") .............................................11
5.3. Session Name ("s=") .......................................12
5.4. Session Information ("i=") ................................12
5.5. URI ("u=") ................................................13
5.6. Email Address and Phone Number ("e=" and "p=") ............13
5.7. Connection Data ("c=") ....................................14
5.8. Bandwidth ("b=") ..........................................16
5.9. Timing ("t=") .............................................17
5.10. Repeat Times ("r=") ......................................18
5.11. Time Zones ("z=") ........................................19
5.12. Encryption Keys ("k=") ...................................19
5.13. Attributes ("a=") ........................................21
5.14. Media Descriptions ("m=") ................................22
6. SDP Attributes .................................................24
7. Security Considerations ........................................31
8. IANA Considerations ............................................33
8.1. The "application/sdp" Media Type ..........................33
8.2. Registration of Parameters ................................34
8.2.1. Media Types ("media") ..............................34
8.2.2. Transport Protocols ("proto") ......................34
8.2.3. Media Formats ("fmt") ..............................35
8.2.4. Attribute Names ("att-field") ......................36
8.2.5. Bandwidth Specifiers ("bwtype") ....................37
8.2.6. Network Types ("nettype") ..........................37
8.2.7. Address Types ("addrtype") .........................38
8.2.8. Registration Procedure .............................38
8.3. Encryption Key Access Methods .............................39
9. SDP Grammar ....................................................39
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