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SDP: Session Description Protocol
RFC 4566

Document type: RFC - Proposed Standard (July 2006; Errata)
Obsoletes RFC 3266, RFC 2327
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: WG Document
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4566 (Proposed Standard)
Responsible AD: Jon Peterson
Send notices to: <jo@acm.org>, <csp@csperkins.org>

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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