An Extension to Session Initiation Protocol (SIP) Events for Conditional Event Notification
RFC 5839
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RFC - Proposed Standard
(May 2010; No errata)
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Last updated |
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2015-10-14
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draft-ietf-sip-subnot-etags
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IETF
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plain text
pdf
html
bibtex
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(None)
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No shepherd assigned
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IESG state |
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RFC 5839 (Proposed Standard)
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Consensus Boilerplate |
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Unknown
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Responsible AD |
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Robert Sparks
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(None)
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Internet Engineering Task Force (IETF) A. Niemi
Request for Comments: 5839 Nokia
Category: Standards Track D. Willis, Ed.
ISSN: 2070-1721 Softarmor Systems
May 2010
An Extension to Session Initiation Protocol (SIP) Events
for Conditional Event Notification
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.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5839.
Niemi & Willis Standards Track [Page 1]
RFC 5839 Entity-Tags for SIP Events May 2010
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
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described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Niemi & Willis Standards Track [Page 2]
RFC 5839 Entity-Tags for SIP Events May 2010
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Document Conventions . . . . . . . . . . . . . . . . . . . 5
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
2. Motivations and Background . . . . . . . . . . . . . . . . . . 5
2.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Problem Description . . . . . . . . . . . . . . . . . . . 5
2.3. Requirements . . . . . . . . . . . . . . . . . . . . . . . 6
3. Overview of Operation . . . . . . . . . . . . . . . . . . . . 7
4. Resource Model for Entity-Tags . . . . . . . . . . . . . . . . 10
5. Subscriber Behavior . . . . . . . . . . . . . . . . . . . . . 12
5.1. Detecting Support for Conditional Notification . . . . . . 13
5.2. Generating SUBSCRIBE Requests . . . . . . . . . . . . . . 13
5.3. Receiving NOTIFY Requests . . . . . . . . . . . . . . . . 14
5.4. Polling or Fetching Resource State . . . . . . . . . . . . 15
5.5. Resuming a Subscription . . . . . . . . . . . . . . . . . 17
5.6. Refreshing a Subscription . . . . . . . . . . . . . . . . 18
5.7. Terminating a Subscription . . . . . . . . . . . . . . . . 18
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