As Jame's has already remarked, we did discuss this in the context of 
location-conveyance.

I believe the SIP list conclusion at that point was that the RFC 3261 text was 
not preventing usage, but the IANA registry text did.

The Warning header registry was created by RFC 3261 in the days before formal 
IANA considerations sections in RFCs. As draft-ietf-sip-sips updates RFC 3261, 
it would seem to me that it is entirely appropriate for that document to update 
the IANA registry for Warning headers. By this I mean you need to update the 
registry definition itself, as well as add new values to it.

This is of course assuming that we decide that Warning headers are the way to 
go.

Regards

Keith

> -----Original Message-----
> From: Rohan Mahy [mailto:[EMAIL PROTECTED] 
> Sent: Tuesday, July 31, 2007 4:12 PM
> To: Francois Audet
> Cc: Cullen Jennings; Rohan Mahy; IETF SIP List; DRAGE, Keith 
> (Keith); Robert Sparks; [EMAIL PROTECTED]; Dean Willis
> Subject: [Sip] Re: Warn-Codes and draft-ietf-sip-sips
> 
> François,
> 
> I think the IANA paragraph you described is too restrictive.  
> The text in RFC3261 section 20.43 seems perfectly fine with 
> registering non-SDP errors.  I would allocate warn-code 380 
> "No SIPS contacts registered".
> 
> thanks,
> -rohan
> 
> On Jul 30, 2007, at 3:23 PM, Francois Audet wrote:
> 
> > Now that we have everybody exited about the prospect of using a 
> > Warn-Code for "SIPS Not Allowed" and "SIP Required" with 
> Response 480, 
> > instead of using new response codes, here is a quote from 27.2/RFC 
> > 3261.
> >
> >    Warning codes provide information supplemental to the 
> status code 
> > in
> >    SIP response messages when the failure of the transaction results
> >    from a Session Description Protocol (SDP) (RFC 2327 [1]) problem.
> >
> > My reading of this is that Warn-Codes are ONLY usable for 
> SDP errors.
> >
> > Doesn't this disqualify the idea of using a Warn-Code for 
> SIP/SIPS URI 
> > problems??????
> >
> > If so, aren't we back to 418/419, or 418+New header (Allow/ 
> Require), 
> > or
> > 480+Response text?
> 
> 
> 
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