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Design Considerations for Session Initiation Protocol (SIP) Overload Control (RFC6357) Disclosure Number: IPCOM000212929D
Original Publication Date: 2011-Aug-01
Included in the Prior Art Database: 2011-Dec-01
Document File: 50 page(s) / 64K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Hilt: AUTHOR [+4]


As with any network element, a Session Initiation Protocol (SIP) [RFC3261] server can suffer from overload when the number of SIP messages it receives exceeds the number of messages it can process. Overload occurs if a SIP server does not have sufficient resources to process all incoming SIP messages. These resources may include CPU, memory, input/output, or disk resources.

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Internet Engineering Task Force (IETF)                           V. Hilt Request for Comments: 6357                      Bell Labs/Alcatel-Lucent Category: Informational                                          E. Noel ISSN: 2070-1721                                                AT&T Labs                                                                  C. Shen                                                      Columbia University                                                               A. Abdelal                                                           Sonus Networks                                                              August 2011

                        Design Considerations for            Session Initiation Protocol (SIP) Overload Control


   Overload occurs in Session Initiation Protocol (SIP) networks when    SIP servers have insufficient resources to handle all SIP messages    they receive.  Even though the SIP protocol provides a limited    overload control mechanism through its 503 (Service Unavailable)    response code, SIP servers are still vulnerable to overload.  This    document discusses models and design considerations for a SIP    overload control mechanism.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   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).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see 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

 Hilt                          Informational                     [Page 1]
 RFC 6357                 Overload Control Design             August 2011

 Copyright Notice

   Copyright (c) 2011 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 docu...