SDP: Session Description Protocol
RFC 8866

Document Type RFC - Proposed Standard (January 2021; No errata)
Obsoletes RFC 4566
Authors Ali Begen  , Paul Kyzivat  , Colin Perkins  , Mark Handley 
Last updated 2021-01-19
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IESG IESG state RFC 8866 (Proposed Standard)
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Internet Engineering Task Force (IETF)                          A. Begen
Request for Comments: 8866                               Networked Media
Obsoletes: 4566                                               P. Kyzivat
Category: Standards Track                                               
ISSN: 2070-1721                                               C. Perkins
                                                   University of Glasgow
                                                              M. Handley
                                                            January 2021

                   SDP: Session Description Protocol


   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.  This document obsoletes RFC 4566.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   Without obtaining an adequate license from the person(s) controlling
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   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction
   2.  Glossary of Terms
   3.  Examples of SDP Usage
     3.1.  Session Initiation
     3.2.  Streaming Media
     3.3.  Email and the World Wide Web
     3.4.  Multicast Session Announcement
   4.  Requirements and Recommendations
     4.1.  Media and Transport Information
     4.2.  Timing Information
     4.3.  Obtaining Further Information about a Session
     4.4.  Internationalization
   5.  SDP Specification
     5.1.  Protocol Version ("v=")
     5.2.  Origin ("o=")
     5.3.  Session Name ("s=")
     5.4.  Session Information ("i=")
     5.5.  URI ("u=")
     5.6.  Email Address and Phone Number ("e=" and "p=")
     5.7.  Connection Information ("c=")
     5.8.  Bandwidth Information ("b=")
     5.9.  Time Active ("t=")
     5.10. Repeat Times ("r=")
     5.11. Time Zone Adjustment ("z=")
     5.12. Encryption Keys ("k=")
     5.13. Attributes ("a=")
     5.14. Media Descriptions ("m=")
   6.  SDP Attributes
     6.1.  cat (Category)
     6.2.  keywds (Keywords)
     6.3.  tool
     6.4.  ptime (Packet Time)
     6.5.  maxptime (Maximum Packet Time)
     6.6.  rtpmap
     6.7.  Media Direction Attributes
       6.7.1.  recvonly (Receive-Only)
       6.7.2.  sendrecv (Send-Receive)
       6.7.3.  sendonly (Send-Only)
       6.7.4.  inactive
     6.8.  orient (Orientation)
     6.9.  type (Conference Type)
     6.10. charset (Character Set)
     6.11. sdplang (SDP Language)
     6.12. lang (Language)
     6.13. framerate (Frame Rate)
     6.14. quality
     6.15. fmtp (Format Parameters)
   7.  Security Considerations
   8.  IANA Considerations
     8.1.  The "application/sdp" Media Type
     8.2.  Registration of SDP Parameters with IANA
       8.2.1.  Registration Procedure
       8.2.2.  Media Types (<media>)
       8.2.3.  Transport Protocols (<proto>)
       8.2.4.  Attribute Names (<attribute-name>)
       8.2.5.  Bandwidth Specifiers (<bwtype>)
       8.2.6.  Network Types (<nettype>)
       8.2.7.  Address Types (<addrtype>)
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