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A Session Initiation Protocol (SIP) Load-Control Event Package (RFC7200) Disclosure Number: IPCOM000236515D
Original Publication Date: 2014-Apr-01
Included in the Prior Art Database: 2014-May-01
Document File: 88 page(s) / 99K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Shen: AUTHOR [+2]


SIP load-control mechanisms are needed to prevent congestion collapse [RFC6357] in cases of SIP server overload [RFC5390]. There are two types of load-control approaches. In the first approach, feedback control, SIP servers provide load limits to upstream servers, to reduce the incoming rate of all SIP requests [SIP-OVERLOAD]. These upstream servers then drop or delay incoming SIP requests. Feedback control is reactive and affects signaling messages that have already been issued by user agent clients. This approach works well when SIP proxy servers in the core networks (core proxy servers) or destination-specific SIP proxy servers in the edge networks (edge proxy servers) are overloaded. By their nature, they need to distribute rate, drop, or window information to all upstream SIP proxy servers and normally affect all calls equally, regardless of destination.

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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


   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

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    ( 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 .............................................