A Session Initiation Protocol (SIP) Load-Control Event Package (RFC7200)
Original Publication Date: 2014-Apr-01
Included in the Prior Art Database: 2014-May-01
Internet Society Requests For Comment (RFCs)
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.
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 http://www.rfc-editor.org/info/rfc7200.
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Shen, et al. Standards Track [Page 1]
RFC 7200 SIP Load-Control Event Package April 2014
Table of Contents
1. Introduction ....................................................3
2. Conventions .............................................