Rfc 3266 support for ipv6 in session description protocol june 2002 hexseq hex4. It extends the protocol identifier of the session description protocol sdp so that it can negotiate use of the internet key exchange protocol ike for media sessions in the sdp offeranswer model. The ietf published the original specification as an ietf proposed standard in april, and subsequently published a revised specification as an ietf proposed standard as rfc in july. An agent which generates a session description in order to create or modify a session. Session description protocol sdp extension for setting audio and video media streams over circuitswitched bearers in the public switched telephone. Rfc 5888 the session description protocol sdp grouping framework rfc 6308 overview of the internet multicast addressing architecture rfc 6410 reducing the standards track to two maturity levels rfc 7104 duplication grouping semantics in the session description protocol rfc 7273. Rfc 3264 an offeranswer model session description protocol june 2002 type, it is a matter of local policy as to how each stream is mapped to the various media sinks for that particular type for example, speakers or a recording device in the case of audio. Sdp is intended to be general purpose so that it can. Private extensions to the session initiation protocol sip for network.
This allows a communication user agent to offer a messaging session. 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. Rfc 8858 indicating exclusive support of rtprtcp multiplexing using sdp abstract. The purpose of this specification is to provide a framework for analyzing the mu.
This document defines a mechanism by which two entities can make use of the session description protocol sdp to arrive at a common view of a multimedia session between them. This document defines two session description protocol sdp attributes. It merely notifies the user about the protocol to be used so that the user can understand the session description. The session description protocol sdp is a format for describing. Session description protocol sdp bandwidth modifiers for rtp control protocol rtcp bandwidth. Below is a sample session description from rfc 4566. Session description protocol sdp is the most common protocol. Sdp is intended to be general purpose so that it can be used in a wide range of network environments and applications.
Rfc 2327 sdp april 1998 will be given in a session description that is communicated by a multicast announcement, though this is not prohibited. There are a few constraints on the policies, however. Ip multimedia call control protocol based on session initiation protocol sip and session description protocol sdp stage 3 3gpp ts 24. This memo defines the session description protocol sdp. Example sdp description with ipv6 addresses the following is an example sdp description using the above abnf for ipv6 addresses.
An offeranswer model with session description protocol sdp. The session description protocol sdp is a format for describing multimedia communication. Rfc home textpdfhtml tracker ipr proposed standard network working group o. If you want to know about sip please go through the introduction to sip a made easy tutorial.
Session description protocol sdp parameters created 20010615 last updated 20200414 available formats xml html. Given below is an example session description, taken from rfc 2327. In this tutorial, we use analogies, examples, and realtime traffic captures to understand rfc 4566 session description protocol better. Introduction the session description protocol provides a generalpurpose format for describing multimedia sessions in announcements or invitations. The session description protocol sdp is a format for describing multimedia communication sessions for the purposes of session announcement and session invitation. The session description protocol defines a standard for defining the parameters for the exchange of media often streaming media between two typically endpoints. Overview this document describes offeranswer examples of session description protocol sdp based on rfc 3264 1. Sdp, also known as session description protocol is the protocol used with sip session initiation protocol to advertise such information. Rfc 3265 has addressed the issue of event notification. Policy and charging control signalling flows and qos parameter mapping. The sdp is typically embedded or encapsulated within another protocol, with the most widelyused application being inside of the sip. If a unicast data stream is to pass through a network address translator, the use of a fullyqualified domain name rather than an unicast ip address is recommended.
Bicc ip bearer control protocol 072001 rfc ietfmmusicsdpmuxattributes16 attribute. Ietf rfc 4825 2007, the extensible markup language xml. You can go through this presentation as an introduction to session description protocol sdp opens. The sdp in these examples is defined by rfc 2327 2. The session description protocol sdp provides mechanisms to describe attributes of multimedia sessions and of individual media streams e. Sip itself is opaque to the session description in the sense that it does not know anything about the session. They allow to group together several m lines for two different purposes. An example below is an example session description, taken from rfc 2327. Sdp uses an entirely textual data format the usascii subset of utf8 to maximize portability among transports. Standards track july 2003 session description protocol sdp bandwidth modifiers for rtp control protocol rtcp bandwidth status of this memo this document specifies an internet standards track protocol for the internet community, and requests discussion and suggestions for improvements. Media description for the internet key exchange protocol. This document defines a session description protocol for this purpose, and for general realtime multimedia session description purposes.
Abstract this memo defines the session description protocol sdp. Sdp is purely a format for session description it does not incorporate a transport protocol, and it is intended to use different transport protocols as appropriate, including the session announcement protocol, session initiation protocol, real time streaming protocol, electronic mail using the mime extensions, and the hypertext transport protocol. June 2002 an offeranswer model with the session description protocol sdp status of this memo this document specifies an internet standards track protocol for the internet community, and requests discussion and suggestions for improvements. While sip deals with establishing, modifying, and tearing down sessions, sdp is solely concerned with the media within those sessions. This document defines a new session description protocol sdp medialevel attribute, rtcpmuxonly, that can be used by an endpoint to indicate exclusive support of rtp and rtp control protocol rtcp multiplexing. The format parameters of the rtp payload are typically communicated between transmission endpoints with the session description protocol sdp, but other protocols, such as the extensible messaging and presence protocol xmpp may be used. Rfc 4145 connectionoriented media september 2005 1. The session initiation protocol sip is an applicationlayer control protocol that can establish, modify, and terminate different kinds of sessions such as internet telephony calls.
Sip session description protocol sdp stands for session description protocol. Pdf the session description protocol sdp is used to describe the parameters of media streams used in. In particular, the origin and connection fields contain ipv6 addresses. Sdp is generally contained in the body part of session initiation protocol popularly called sip. Pdf real time control protocol rtcp attribute in session. Rfc 5888 the session description protocol sdp grouping. Sdp is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation. Rfc 3264 an offeranswer model session description protocol june 2002 offer. Session initiation protocol an overview sciencedirect. When a session requires multiple ports, sdp assumes that these ports have.
Session description parameters 1 session description denotes optional v protocol version o ownercreator and session identifier s session name i session information u uri of description e email address p phone number c connection information not required if included in all media b bandwidth information. Rfc 8859 a framework for session description protocol sdp attributes when multiplexing abstract the purpose of this speci. Rfc 8859 a framework for session description protocol sdp attributes when multiplexing abstract. Sip takes the help of sdp session description protocol which describes a session and rtp real time transport protocol used for delivering voice and video over ip. Send questions or comments to email protected the session description protocol sdp is a format for describing streaming media communications parameters. Introduction the session description protocol sdp 1 is a protocol that is intended to describe multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation.
Normal rfc ietfmmusicrfc4566bis37 rfc ietfmmusicsdpmuxattributes16 attribute. Rfc 4317 session description protocol sdp offeranswer. This memo does not describe multicast address allocation or the distribution of sdp messages in detail. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific network drive. Session description protocol sdp bandwidth modifiers for rtp control protocol rtcp bandwidth technical report pdf available july 2003 with 591 reads how we measure reads. The session description protocol sdp content attribute. Its impossible to truly understand sip without understanding its cousin, session description protocol sdp. That sip would relegate media to another protocol is not accidental.
The offers and answers are assumed to be transported using a protocol such as session initiation protocol sip 3. In the model, one participant offers the other a description of the desired session from their perspective, and the other participant answers with the desired session. It is used to describe multimedia sessions in a format understood by the participants over a network. Understanding session description protocol sdp tao. The session description protocol sdp is a format for describing streaming media communications parameters. Its predominant use is in support of streaming media applications, such as voice over ip voip and video conferencing. Rfc 3556 session description protocol sdp bandwidth. Rfc 3264 an offeranswer model with session description. The session description protocol sdp is used to describe the parameters of media streams used in multimedia sessions.
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