Nice draft.
One thing this highlights is that even if we solve the identity problem
for E.164 numbers in sip-sip cases, the identity problem will remain for
the pstn-sip case.
The solutions for the sip-sip case will presumably require that somebody
actually *know* the sender is the owner of the number. The GW in a
pstn-sip call will in general not know that. In reality the callerid in
pstn calls cannot be trusted, so a true assertion of it cannot be done
with a pstn source. Yet from a practical perspective most will consider
a pstn assertion of identity to be something they want to know about.
That suggests to me that a weaker form of assertion is needed in that
case, and that for suitably smart phones different forms of callerid
presentation be used in those cases, reflecting the degree of confidence
in the value being presented.
Thanks,
Paul
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