Requirements for Overload Control in SIP

Status: SIPPING WG draft, version 0
Date of last update: November 27, 2006
Authors: J. Rosenberg
Current Document: draft-ietf-sipping-overload-reqs-00.txt.
Summary: Overload occurs in Session Initiation Protocol (SIP) networks when proxies and user agencies have insuffient resources to complete the processing of a request. SIP provides limited support for overload handling through its 503 response code, which tells an upstream element that it is overloaded. However, numerous problems have been identified with this mechanism. This draft summarizes the problems with the existing 503 mechanism, and provides some requirements for a solution.
Archive of older drafts:
  1. draft-rosenberg-sipping-overload-reqs-02.txt, October 22, 2006
  2. draft-rosenberg-sipping-overload-reqs-01.txt, June 26, 2006.
  3. draft-rosenberg-sipping-overload-reqs-00.txt, February 25, 2006.