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This Internet-Draft is no longer active.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