On Sun, Oct 26, 2008 at 10:10 PM, Juha Heinanen <[EMAIL PROTECTED]> wrote:
> Hannes Tschofenig writes:
>
>  > >pai does not help if you receive a request from anywhere on
>  > >the internet.
>  >
>  > Depends a bit on what you call "YOU receive".
>
> if you cannot trust the proxy or ua you receive the request from, pai
> header has no value.

I consider [1] to give a good description.

[1] 
http://tools.ietf.org/html/draft-elwell-sip-e2e-identity-important-01#section-2.2

Thanks,
-- 
Victor Pascual Ávila
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