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

["Elwell, John" <john.elwell at siemens.com>]

> -----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.

John


>There is not much we can do about that. The 
> other is callee
> may have call forwarding setup and may wonder if To in INVITE 
> can be used
> for DERIVE test even though he is not registered under it. If 
> he is consent
> with using it (which he should be able to), the caller will receive
> a legitimate DERIVE test. So what I really think may fail here is 
> inconsistent
> rewriting From/to by middleboxes.
> 
> -jiri
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