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Session Initiation Protocol (SIP) Event Notification Extension for Notification Rate Control
RFC 6446

Internet Engineering Task Force (IETF)                          A. Niemi
Request for Comments: 6446                                       K. Kiss
Updates: 3265                                                      Nokia
Category: Standards Track                                      S. Loreto
ISSN: 2070-1721                                                 Ericsson
                                                            January 2012

     Session Initiation Protocol (SIP) Event Notification Extension
                     for Notification Rate Control

Abstract

   This document specifies mechanisms for adjusting the rate of Session
   Initiation Protocol (SIP) event notifications.  These mechanisms can
   be applied in subscriptions to all SIP event packages.  This document
   updates RFC 3265.

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/rfc6446.

Niemi, et al.                Standards Track                    [Page 1]
RFC 6446                   Event Rate Control               January 2012

Copyright Notice

   Copyright (c) 2012 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   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, et al.                Standards Track                    [Page 2]
RFC 6446                   Event Rate Control               January 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Definitions and Document Conventions . . . . . . . . . . . . .  5
   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Use Case for Limiting the Maximum Rate of Notifications  .  5
     3.2.  Use Case for Setting a Minimum Rate for Notifications  . .  6
     3.3.  Use Case for Specifying an Adaptive Minimum Rate of
           Notifications  . . . . . . . . . . . . . . . . . . . . . .  6
     3.4.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  7
   4.  Basic Operations . . . . . . . . . . . . . . . . . . . . . . .  8
     4.1.  Subscriber Behavior  . . . . . . . . . . . . . . . . . . .  8
     4.2.  Notifier Behavior  . . . . . . . . . . . . . . . . . . . .  9
   5.  Operation of the Maximum Rate Mechanism  . . . . . . . . . . .  9
     5.1.  Subscriber Behavior  . . . . . . . . . . . . . . . . . . .  9
     5.2.  Notifier Behavior  . . . . . . . . . . . . . . . . . . . . 10
     5.3.  Selecting the Maximum Rate . . . . . . . . . . . . . . . . 11
     5.4.  The Maximum Rate Mechanism for the Resource List Server  . 11
     5.5.  Buffer Policy Description  . . . . . . . . . . . . . . . . 13
       5.5.1.  Partial-State Notifications  . . . . . . . . . . . . . 13
       5.5.2.  Full-State Notifications . . . . . . . . . . . . . . . 13
     5.6.  Estimated Bandwidth Savings  . . . . . . . . . . . . . . . 14
   6.  Operation of the Minimum Rate Mechanism  . . . . . . . . . . . 14
     6.1.  Subscriber Behavior  . . . . . . . . . . . . . . . . . . . 14
     6.2.  Notifier Behavior  . . . . . . . . . . . . . . . . . . . . 15
     6.3.  Selecting the Minimum Rate . . . . . . . . . . . . . . . . 16

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