Skip to main content

An Extension to Session Initiation Protocol (SIP) Events for Conditional Event Notification
draft-ietf-sip-subnot-etags-03

Document Type Replaced Internet-Draft (sip WG)
Expired & archived
Author Aki Niemi
Last updated 2009-04-20 (Latest revision 2008-07-14)
Replaces draft-niemi-sip-subnot-etags
Replaced by draft-ietf-sipcore-subnot-etags
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Formats
Additional resources Mailing list discussion
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-sipcore-subnot-etags
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:

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 have a serious deficiency in that they 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.

Authors

Aki Niemi

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)