Re: [Sip] Vocabulary and problem statement for Request-URI, retargeting, and SIP routing (long, but read it!)

[Dean Willis <[e-mail]>]

Hadriel Kaplan wrote:
> 
>> We also have a related operation:
>> 
>> 4) Request redirection, which informs an upstream node about a new 
>> identity to target instead of the original.
> 
> 
> This is described from the aspect of the downstream node sending the
> 3xx, right?  Vs. what it is for the upstream node recursing on the
> 3xx? (which has no idea if it's performing (2) or (3) when this
> occurs, but I guess could be added to the 3xx contact as a param such
> as described in JR's draft)

right.

> So if a proxy is doing "redirection" it is sending a 3xx,

Right.

> whereas the
> upstream proxy or UAC getting that 3xx is not doing redirection, but
> in fact "recursing".
> 

The upstream node is just generating a new request. It really
doesn't know where that request is going, except that the new request
URI was obtained during an attempt to reach the old one. We'd actually
have more information from a REFER request.

We've already seen all sorts of hideous problems related to an upstream
proxy recursing on a 3xx. My take is that we should never do this in a
proxy.

--
Dean


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