A Session Initiation Protocol (SIP) Load-Control Event Package
RFC 7200

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Internet Engineering Task Force (IETF)                           C. Shen
Request for Comments: 7200                                H. Schulzrinne
Category: Standards Track                                    Columbia U.
ISSN: 2070-1721                                                 A. Koike
                                                                     NTT
                                                              April 2014

     A Session Initiation Protocol (SIP) Load-Control Event Package

Abstract

   This specification defines a load-control event package for the
   Session Initiation Protocol (SIP).  It allows SIP entities to
   distribute load-filtering policies to other SIP entities in the
   network.  The load-filtering policies contain rules to throttle calls
   from a specific user or based on their source or destination domain,
   telephone number prefix.  The mechanism helps to prevent signaling
   overload and complements feedback-based SIP overload control efforts.

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/rfc7200.

Copyright Notice

   Copyright (c) 2014 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.

Shen, et al.                 Standards Track                    [Page 1]
RFC 7200             SIP Load-Control Event Package           April 2014

Table of Contents

   1. Introduction ....................................................3
   2. Conventions .....................................................3
   3. SIP Load-Filtering Overview .....................................4
      3.1. Load-Filtering Policy Format ...............................4
      3.2. Load-Filtering Policy Computation ..........................4
      3.3. Load-Filtering Policy Distribution .........................4
      3.4. Applicable Network Domains .................................8
   4. Load-Control Event Package ......................................9
      4.1. Event Package Name .........................................9
      4.2. Event Package Parameters ...................................9
      4.3. SUBSCRIBE Bodies ...........................................9
      4.4. SUBSCRIBE Duration .........................................9
      4.5. NOTIFY Bodies .............................................10
      4.6. Notifier Processing of SUBSCRIBE Requests .................10
      4.7. Notifier Generation of NOTIFY Requests ....................10
      4.8. Subscriber Processing of NOTIFY Requests ..................10
      4.9. Handling of Forked Requests ...............................12
      4.10. Rate of Notifications ....................................12
      4.11. State Delta ..............................................12
   5. Load-Control Document ..........................................13
      5.1. Format ....................................................13
      5.2. Namespace .................................................13
      5.3. Conditions ................................................14
           5.3.1. Call Identity ......................................14
           5.3.2. Method .............................................16
           5.3.3. Target SIP Entity ..................................17
           5.3.4. Validity ...........................................18
      5.4. Actions ...................................................18
   6. XML Schema Definition for Load Control .........................20
   7. Security Considerations ........................................23
   8. IANA Considerations ............................................24
      8.1. Load-Control Event Package Registration ...................24
      8.2. application/load-control+xml Media Type Registration ......24
      8.3. URN Sub-Namespace Registration ............................25
      8.4. Load-Control Schema Registration ..........................26