Subject: Re: [Sip] Use 599 instead of 482 fro Request Merged?

From: Gonzalo Camarillo <[email-masked]>
Date: Thu, 01 Nov 2001 22:25:02 +0200

Hello,

Jo Hornsby wrote:
> 
> > It has been stipulated in the spec that when two merged requests
> > arrive at a
> > UAS, the first one is processed and the second one is responded
> > with a  482.
> >
> > Now, if the first request that is processed elicits a response higher than
> > 482 (eg. 486 Busy) then the forking proxy will return the best response of
> > 482 to the UAC.
> >
> > I support the suggestion of choosing a high response code, like 599.
> 
> 599 is in the wrong class.
> 
> I would note that this is a general problem: for
> instance, 486 seems far more preferable to me
> than 404.  Thus far, the notion of a "best"
> response has always been a little random; however,
> bis-05 seems to open things up nicely by allowing
> a proxy to "select" a response from the lowest
> class (step 5 of section 16.6).  This then becomes
> a nonproblem.

Exactly. Within a class, a lower value of a status code does not mean
higher priority. The decision of which response is "the best received so
far" is a matter of implementation. However, proxies should always try
to return responses that may allow the UAC to try again (like you point
out in your example, a 486 better than a 404).

Regards,

Gonzalo

>  - Jo.
> 
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-- 
Gonzalo Camarillo                    Phone :   +1 212 939 71 71
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