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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Below is a sample session description from RFC Private SIP proxy-to-proxy extensions for supporting the PacketCable distributed call signaling architecture.
Basic network media services with SIP.
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.
A message summary and message waiting indication event package for the SIP. SIP basic call flow examples. Private Extensions to the SIP for asserted identity within trusted networks. RTCP ports for the audio and video streams of andrespectively, are implied. SIP Extension for event state publication. The SIP Join header.
RFC – A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer
New attributes are added to the standard occasionally through registration with IANA. If the weekly 1-hour session was repeated every Sunday for full one year, i. Update to the SIP preconditions framework. Common gateway interface for SIP. Setting up SIP application composition. Retrieved from ” https: A framework for conferencing with the SIP.
Reliability of provisional responses in SIP. Private SIP extensions gfc media authorization.
Session Description Protocol
Uetf mechanism for content indirection in SIP messages. SIP Extension Header field for registering non-adjacent contacts. Indicating user agent capabilities in the SIP. Implementations are allowed to relax this to omit the carriage return and supply only the line feed. From Wikipedia, the free encyclopedia. In both cases, each textual field in the iett 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 iwtf sdplang in the current Media section, or otherwise their last value in the Session section.
For example, if a daylight adjustment will subtract 1 hour on 31 October at 03am UTC i. An offer and answer model with SDP.
The SIP Refer method. Recipients of this session description are instructed to only receive media.
This product complies with standards for SIP applications as noted in the following table. For example, to schedule the same event also on Saturday at the same time of the day you would use:. ietv
A watcher information event template package for the SIP. Names are only unique within the associated syntactic construct, i. A SIP event package and data format for various settings in support for the push-to-talk over cellular PoC service. 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 A presence event package for the SIP.
Attributes can appear within the Session or Media sections and are scoped accordingly as session-level or media-level.
Browse all SIP topics. Values are typically a UTF-8 encoding.
SIP industry standards compliance
All these offsets are relative rffc the start time, they are not cumulative. If the stop time is 0 then the session is “unbounded. SDP does not deliver any media by itself but is used between endpoints for negotiation of media type, format, and all associated properties. Intervals can be represented with Network Time Protocol times or in typed time: This page was last edited on 7 Octoberat SDP is used for describing multimedia communication sessions for the purposes of session announcement, session invitation, and parameter negotiation.
SDP uses attributes to extend the core protocol.
This session is originated by the user ‘jdoe’, at IPv4 address Compliance with standards for SIP applications.