T i m wrote on 03/07/2007 : 
>
> Ok, that one doesn't. I mean. I hear what you say but I'm not sure I
> see the point of doing so?

Think of it like an email address.

If you were with the same ISP as me, in theory, I could email you
simply with the address "tim" and the mail would reach you.

However, if we were on different ISP, I would have to email you using
"tim@yourISP"

The SIP number is specific to your VoIP provider, your SIP address
allows calls to reach you from (any) other network. (SIPGATE have
chosen to block most calls originating off their network) Your PSTN
number allows calls to reach you from the normal phone network.

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