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

Document Type Replaced Internet-Draft (individual)
Expired & archived
Author Aki Niemi
Last updated 2007-06-13 (Latest revision 2007-03-08)
Replaced by draft-ietf-sip-subnot-etags
RFC stream (None)
Intended RFC status (None)
Formats
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-sip-subnot-etags
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This Internet-Draft is no longer active.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 do not allow state to persist over a subscription refresh, or between two consecutive polls. This inability to suppress notifications of state already known to the subscriber results in superfluous traffic in the network. 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 an 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.)