An Extension to the Session Initiation protocol to Assure Congestion Safety
draft-willis-sip-congestsafe-00

Document Type Expired Internet-Draft (individual)
Last updated 2002-07-24
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-willis-sip-congestsafe-00.txt

Abstract

The Session Initiation Protocol allows the use of UDP for transport of SIP messages. The use of UDP inherently risks network congestion problems, as UDP itself does not define congestion prevention, avoidance, detection, or correction mechanisms. This problem is aggravated by large SIP messages which fragment at the UDP level. Transport protocols in SIP are also negotiated on a per-hop basis, at the SIP level, so SIP proxies may convert from TCP to UDP and so forth. This document defines what it means for SIP nodes to be congestion safe and specifies an extension by which a SIP User Agent may require that its requests are treated in a congestion safe manner.

Authors

Dean Willis (dean.willis@softarmor.com)
Ben Campbell (ben.cambell@wcom.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)