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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This product complies with SIP standards as noted in the following table. Names are only unique within the associated syntactic construct, i. Recipients of this session description are instructed to only receive media. If the stop time rdc 0 then the session is “unbounded. SDP is used for describing multimedia communication sessions for the purposes of session announcement, session invitation, and parameter negotiation.

A presence event package for the SIP. All these offsets are relative to the start time, they are not cumulative.

Session Initiation Protocol (SIP) industry standards compliance

A mechanism for content indirection in SIP messages. 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 rendered to the user or application 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.

Within an SDP message there are three main sections, detailing the sessiontimingand media descriptions. This product complies with standards for SIP applications as noted in the following table.


SIP industry standards compliance

Its 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. Indicating user agent capabilities in the SIP.

SIP Extension Header field for service route discovery during registration. Private SIP proxy-to-proxy extensions for supporting the PacketCable distributed call signaling architecture. A framework for conferencing with the SIP. SIP extension for instant messaging. The set of properties and parameters are often called a session profile. Below is a sample session description from RFC RTCP ports for the rf and video streams of andrespectively, are implied.

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

This page was last edited on 7 Octoberat Values are typically a UTF-8 encoding. Retrieved from ” https: This session 32644 originated by the user ‘jdoe’, at IPv4 address A message summary and message waiting indication event package for the SIP. Private SIP extensions for media authorization. The early session disposition type for the SIP.

Common gateway interface for SIP. The SDP specification does not incorporate any transport protocol; it is purely a format for session description.

However, support rfx RFC comes with the following limitations: SIP Extension for event state publication. SDP is designed to be extensible to support new media types and formats.

The first one is istf in the Session or Media sections to specify another character encoding as registered in the IANA registry [5] than the default one highly recommended UTF-8 where it is used in standard protocol keys whose values rfv containing a text intended to be displayed to a user. Browse all SIP topics. Integration of resource management and SIP. For example, if a daylight adjustment will subtract 1 hour on 31 October at 03am UTC i.

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 32664, 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 rrc or after each daylight adjustment.


A session is described by a series of fields, one per line. Basic network media services with SIP. Views Read Edit View history. Each message may contain multiple timing and media descriptions. From Wikipedia, the free encyclopedia. The SIP Replace header. If the weekly 1-hour session was repeated every Sunday for full one year, i. 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 NTP format in an absolute UTC timezone.

New attributes are added to the standard occasionally through registration with IANA. SDP does not deliver any media by itself but is used ffc endpoints for negotiation of media type, format, and all associated properties. Istf of provisional responses in SIP. Update to the SIP preconditions framework.

SIP basic call flow examples. The SIP Join header. 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.