RE: [Sip] I-D ACTION:draft-ietf-sip-congestsafe-01.txt

["Ravi Shiroor" <ravis@sasken.com>]

inline.

> -----Original Message-----
> From: sip-admin@ietf.org [mailto:sip-admin@ietf.org]On Behalf Of
> Internet-Drafts@ietf.org
> Sent: Wednesday, February 19, 2003 5:35 PM
> To: IETF-Announce: ;
> Cc: sip@ietf.org
> Subject: [Sip] I-D ACTION:draft-ietf-sip-congestsafe-01.txt
> 
> 
> 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-01.txt
> 	Pages		: 13
> 	Date		: 2003-2-14
> 	
> 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.

I remember that we had a discussion (was it here or on sip-implementors?)
and the conclusion was that no proxy will do a conversion from TCP to UDP.
(reliable to non-reliable transport). 

> 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.
> 
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