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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A SIP event package for registrations. The SDP specification does not incorporate any transport protocol; it is purely a format for session description. Values are typically a UTF-8 encoding. Retrieved from ” https: SIP torture test messages. This page was last edited on 7 Octoberat Transcoding services invocation in the SIP using third-party call control 3pcc. SIP basic call flow examples. A message summary and message waiting indication event package for the SIP.

The early session disposition type for the SIP.

Common gateway interface for SIP. In both cases, each textual field in the protocol which are not interpreted symbolically by the protocol itself, will be interpreted as opaque strings, but efc to the user or rgc with the values indicated in the last occurrence of the charset and sdplang in the current Media section, or otherwise their last value in the Session section.

An invite-initiated dialog event package for the SIP. From Wikipedia, the free encyclopedia. Instead of specifying this timezone and having to support a database of timezones for knowing when and where daylight adjustments will be needed, the repeat times are assumed to be all defined within the same timezone, and SDP supports the indication of NTP absolute times when a daylight offset expressed in seconds or using a type time will need to be applied to the repeated start time or end time falling at or after each daylight adjustment.


Recipients of this session description are instructed to only receive media. A watcher information event template package for the SIP. Browse all SIP topics. SDP uses attributes to extend the core protocol.

Session Description Protocol – Wikipedia

Reliability of provisional responses in SIP. If the weekly 1-hour session was repeated every Sunday for full one year, i. Each message may contain multiple timing and media descriptions. Names are only unique within the associated syntactic construct, i.

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

The set of properties and parameters are often called a session profile. Thus an hour meeting from 10am UTC on 1 Augustwith a single repeat time a week later at the same time can be represented as:. SIP Extension for event state publication. Private Extensions to the SIP for asserted identity within trusted networks. New attributes are added to the ietc occasionally through registration with IANA.

RTCP ports for the audio and video streams of andrespectively, are implied.

When repeat times 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 Ief format in an absolute UTC timezone.

The SIP Replace header.

By using this site, you agree to the Terms of Use and Privacy Policy. SDP is used for describing multimedia communication sessions for the purposes of session announcement, session invitation, and parameter negotiation. Basic network media services with SIP. Irtf name is “SDP Seminar” and extended session information “A Seminar on the session description protocol” is included along with a link for additional information and an email address to contact the responsible party, Jane Doe.


Integration of resource management and SIP. Rrfc example, to schedule the same event also on Ieetf at the same time of the day you would use:. However, support for RFC comes with the following limitations: Attributes can appear within the Session or Media sections and are scoped accordingly as session-level or media-level. Best current practices for third-party call control 3pcc in the SIP.

SDP does not deliver any media by itself but is used between endpoints for negotiation of media type, format, and all associated properties. Indicating user agent capabilities in the SIP.

SIP industry standards compliance

This session is originated by the user ‘jdoe’, at IPv4 address SIP Extension Header field for registering non-adjacent contacts. SIP extension for instant messaging. The SIP Refer method. Update to the SIP preconditions framework.

Compliance with standards for SIP applications. SDP is designed to be extensible to support new media types and formats. Within an SDP message there are three main sections, detailing the sessiontimingand media descriptions.

A framework for conferencing with the SIP. Below is a sample session description from RFC All these offsets are relative to the start time, they are not rcf.

Intervals can be represented with Network Time Protocol times or in typed time: Setting up SIP application composition. Webarchive template wayback links Articles with short description 32264 articles with unsourced statements Articles with unsourced statements from August Pages using RFC magic links.