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 message summary and message waiting indication event package for the SIP. Names are only unique within the associated syntactic construct, i. This product complies with standards for SIP applications as noted in the following table. Private SIP extensions for media authorization.

A mechanism for content indirection in SIP messages. Retrieved from ” https: SIP extension for instant messaging. Integration of resource management and SIP. A framework for conferencing with the SIP. The early session disposition type for the SIP. A session is described by a series of fields, one per line. Setting up SIP application composition. SIP Extension Header field for service route discovery during registration.

This page was last edited on 7 Octoberat The SIP Replace header. 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: SIP basic call flow examples.

SDP does not deliver any media by itself but is used between endpoints for negotiation of media type, format, and all associated properties.

Session Description Protocol

Each message may contain multiple timing and media descriptions. 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.


A SIP event package for registrations. Best current practices for third-party call control 3pcc in the SIP. The second one is used to specify in which language it is written alternate texts in multiple languages may be 32644 in the protocol, and selected automatically by the user agent according to user preferences.

SIP industry standards compliance

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 rc.

The set of properties and parameters are often called a session profile. SDP uses 33264 to extend the core protocol. A watcher information event template package for the SIP.

This product complies with SIP standards as frc in the following table. Attributes can appear within the Session or Media sections and are scoped accordingly as session-level or media-level.

Browse all SIP topics. Ieetf offer and answer model with SDP. SDP is designed to be extensible to support 32264 media types and formats. 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 Implementations are allowed to relax this to omit the carriage return and supply only the line feed.

SIP Extension Header field for registering non-adjacent contacts. All these offsets are relative to the start time, they are not cumulative. Early media and ringing tone generation in the SIP.


The SDP specification does not incorporate any transport protocol; it is purely a format for session description. Update to the 2364 preconditions framework. In both cases, each textual field in the protocol which are not interpreted symbolically by the protocol 3246, 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.

RFC – An Offer/Answer Model with Session Description Protocol (SDP)

Private SIP proxy-to-proxy extensions rfx supporting the PacketCable distributed call signaling architecture. However, support for RFC comes with the following limitations: Views Read Edit View history.

For example, if a daylight adjustment will subtract 1 hour on 31 October at 03am UTC i. The first one is used 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 are 3246 a text intended to be displayed to a user.

Session Initiation Protocol (SIP) industry standards compliance

Compliance with standards for SIP applications. A SIP event package and data format for various settings in support for the push-to-talk over cellular PoC service. Thus an hour meeting from 10am UTC on 1 Augustwith a single repeat time a week later at the ieft time can be represented as:. The SIP Join header.