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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SDP uses attributes to extend the core protocol. Recipients of this session description are instructed to only receive media. This page was last edited on 7 Octoberat The set of properties and parameters are often called a session profile.

SDP is designed to be extensible to support new media types and formats. By using this site, you agree to the Terms of Use and Privacy Policy. The fields present in their values are considered in the protocol as opaque strings, they are used as identifiers, just like paths in an URL or filenames in a file system: Reliability of provisional responses in SIP. A framework for conferencing with the SIP.

Compliance with standards for SIP applications. Views Read Edit View history. Update to 3246 SIP preconditions framework. An offer and answer model with SDP. All these offsets are relative to the start time, they are not cumulative. SIP Extension Header field for registering non-adjacent contacts. A mechanism for content indirection in SIP messages.


SIP extension for instant messaging. However, support for RFC comes with the following limitations: Each message may contain multiple timing and media descriptions.

An invite-initiated dialog event package for the SIP. The SIP Refer method. The early session disposition type for the SIP. Private Extensions to the SIP for asserted identity within trusted networks.

SIP industry standards compliance

SIP Extension Header rfd for service route discovery during registration. A SIP event package for registrations. Values are typically a UTF-8 encoding. SDP does not deliver any media by itself but is used between endpoints for negotiation rdc media type, format, and all associated properties. Note also that sessions may be repeated irregularly over a week but scheduled the same way for all weeks in the period, by adding more tuples in the r parameter.

RTCP ports for the audio and video streams of andrespectively, are implied. The SDP specification does not incorporate any transport protocol; it is purely a format for session description. Basic network media services with SIP. This product complies with standards for SIP applications as noted in the following table.

Session Description Protocol – Wikipedia

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 rffc indication of NTP absolute times when a rffc 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.


A SIP event package and data format for various settings in support for the push-to-talk over cellular PoC service. Indicating user agent capabilities in the SIP. 364 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 uetf time and the stop time which are still specified in NTP format in an absolute UTC timezone.

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:. Integration of resource management and SIP.

Session Description Protocol

Implementations are allowed to relax this to omit the carriage return and supply only the line feed. Names are only unique within the associated syntactic construct, i. If the stop time is 0 then rtc session is “unbounded.