Re: [Sip] Review of draft-kuthan-sip-derive-00

[Jiri Kuthan <jiri at iptel.org>]

Elwell, John wrote:
>  
>
> > -----Original Message-----
> > From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On 
> > Behalf Of Jiri Kuthan
> > Sent: 20 November 2008 17:58
> > To: Raphael Coeffic
> > Cc: sip at ietf.org; draft-kuthan-sip-derive at tools.ietf.org
> > Subject: Re: [Sip] Review of draft-kuthan-sip-derive-00
> >
> > Raphael Coeffic wrote:
> >
> > > I believe that the counter measure that you are proposing 
> > has already 
> > > been adressed in the draft. Concerning call forwarding, we 
> > know that 
> > > this is an issue.
> > There are two such. The caller may have call forwarding setup 
> > --> DERIVE
> > test will fail. 
> [JRE] Why will it fail? Call forwarding applies to the handling of
> INVITE requests. SUBSCRIBE requests are not necessarily handled the
> same, although I imagine that many implementations may do so, and
> therefore your deduction is probably correct in many cases, but not
> necessarily all cases.

The point is not that it possibly may succeed. The point is that it
possibly may fail because symmetric forwarding is simply not guranteed.
Therefore we know positive DERIVE tests provide us with value, negative
don't.

-jiri
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