I agree with Dale.

This may be *technically* conforming to the spec, but is pathological 
behavior. Its right up there with returning a 200 to the registration 
request without having accepted the registration at all.

        Paul

[EMAIL PROTECTED] wrote:
>    From: "Barman, Sibon B \(Sibon\)" <[EMAIL PROTECTED]>
> 
>    One thing I am still not clear if 3261 specifies clearly that the
>    contact address in the response has to be the same (in literal sense) as
>    the contact address in the registration request.  Is the public address
>    corresponding to a private address (in NAT environment) considered
>    equivalent?
> 
> I see no reason to think so.  I would not expect UAs to behave
> correctly if the REGISTER request contained the private address (which
> the UA knows) and the response contained the public address (which the
> UA does not know).
> 
> Dale
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