An Extension to Session Initiation Protocol Events for Conditional Event Notification
RFC 5839, “An Extension to Session Initiation Protocol Events for Conditional Event Notification”, is a Proposed Standard document published in May 2010 by A. Niemi, D. Willis. The canonical text is published by the RFC Editor.
Abstract
The Session Initiation Protocol (SIP) events framework enables receiving asynchronous notification of various events from other SIP user agents. This framework defines the procedures for creating, refreshing, and terminating subscriptions, as well as fetching and periodic polling of resource state. These procedures provide no tools to avoid replaying event notifications that have already been received by a user agent. This memo defines an extension to SIP events that allows the subscriber to condition the subscription request to whether the state has changed since the previous notification was received. When such a condition is true, either the body of a resulting event notification or the entire notification message is suppressed. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 5839 is hosted at rfc-editor.org. Available in TXT,HTML.
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