Canonical URL: ; File formats: Plain Text PDF Discuss this RFC: Send questions or comments to [email protected] The Session Description Protocol (SDP) is a format for describing streaming media communications parameters. 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 Offer/Answer Model with the Session Description Protocol(RFC ). SIP Configuration Guide, Cisco IOS Release 15M&T-Achieving SIP RFC Compliance. (SDP), as defined in the IETF specification, RFC , An Offer/ Answer.

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Private SIP extensions for media authorization. However, support for RFC comes with the following limitations: SDP does not deliver any media by itself but is used between endpoints for negotiation of media type, format, and all associated properties. SDP uses attributes to extend the core protocol.

When repeat letf are specified, the start time of each repetition may need to be adjusted so that it will occur at the same local time in a specific timezone throughout the period between the start time and the stop time which are still specified in NTP format in an absolute UTC timezone. RTCP ports for the audio and video streams of andrespectively, are implied.


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If the stop time is 0 then the session is “unbounded. The second one is used to specify in which language it is written alternate texts in multiple languages may be carried in the protocol, and selected automatically by the user agent according to user preferences.

Early media and ringing tone generation in the SIP. Basic network media services with SIP. The SIP Refer method.

RFC – A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer

SDP is designed to be extensible to support new media types and formats. A message summary and message waiting indication event package for the SIP. Indicating user agent capabilities in the SIP. Update to the SIP preconditions framework. SIP torture test messages.

Retrieved from ” https: Transcoding services invocation in the SIP using third-party call 33264 3pcc. A mechanism for content indirection in SIP messages. Private Extensions to the SIP for asserted identity within trusted networks. New attributes are added to the standard occasionally through registration with IANA.

An invite-initiated dialog event package for the SIP. Compliance with standards for SIP applications.

Session Description Protocol

The SIP Join header. This product complies with standards for SIP applications as noted in the following table. Each message may contain multiple timing and media descriptions. Names are only unique within the associated syntactic construct, i.


Implementations are allowed to relax this to omit the carriage return and supply only the line feed. A SIP event package for registrations. A framework for conferencing with the SIP.

SIP industry standards compliance

Webarchive template wayback links Articles with short description All articles with unsourced statements Articles with unsourced statements from August Pages using RFC magic links. Recipients of this session description are instructed to only receive media.

Thus an hour iet from 10am UTC on 1 Augustwith a single repeat time a week later at the same time can be represented as:.

The SDP specification does not incorporate any transport protocol; it is purely a format for session description. The set of properties and parameters are often called a session profile.

A SIP event package and data format for various settings in support for the push-to-talk over cellular PoC service.

For example, if a daylight adjustment will subtract 1 hour on iietf October at 03am UTC i. This session is specified to last for two hours using NTP timestamps, with a connection address which indicates the address clients must connect to or — when a multicast address is provided, as it is here — subscribe to specified as IPv4 SIP basic call flow examples.