> Yan Huang wrote:
>
> assume A call B, Is there anyway to check B is registered or not?
> Thanks.
> yan
No.
Even if you trusted A to provide is registered address in the From header, to verify
that he is registered, you would have to send your own REGISTER message to his
registrar to check for actual registration. It is extremely unlikely that you would be
permitted to do that.
Paul
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