A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Session Initiation Protocol Working Group of the IETF.
Title : Session Initiation Protocol Extension to Assure
Congestion Safety
Author(s) : D. Willis, B. Campbell
Filename : draft-ietf-sip-congestsafe-02.txt
Pages : 12
Date : 2003-10-14
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 by which a SIP User Agent may require
that its requests are not sent over UDP or other transports having
congestion-related characteristics similar to those of UDP.
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