Subject: RE: [Sipping] Redirection by a UAS

From: "Elwell, John" <[email-masked]>
Date: Tue, 06 Apr 2004 11:51:40 +0100

> -----Original Message-----
> From: Michael Hammer [mailto:[email-masked]] 
> Sent: 05 April 2004 18:20
> To: Elwell, John
> Cc: [email-masked]; [email-masked]
> Subject: RE: [Sipping] Redirection by a UAS
> 
> 
> At 05:28 PM 4/5/2004 +0100, Elwell, John wrote:
> >Michael,
> >
> >You wrote:
> > > Would it be possible to include a last resort Contact that
> > > refers back to
> > > itself, but in such a way that the local part has a 
> convention that
> > > indicates that the forwarding failed?
> > >
> >This sounds interesting. Would the fact that the Call-ID has 
> not changed be
> >a sufficient indication that it is a repeat attempt, 
> presumably because
> >forwarding failed?
> >
> >John ([email-masked])
> 
> Because of cases where re-transmissions are used (which could be 
> temporarily mis-routed), I would not want to rely on an implicit 
> indication.  An explicit index into a stored call state 
> (which I assume 
> exists) would seem better to me.
> 
> Mike
>

In that case, perhaps History-Info would suffice. The UAS could see from
History-Info that the request has been redirected from itself elsewhere and
then back again.

John 

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