Orchid XP v8 wrote:
...
> Well anyway, obviously I know precisely nothing about VoIP. I understand 
> that such a technology could theoretically exist, but it's news to me 
> that it has ever been deployed on a large scale.
...

I suggest that you read about Asterisk:

   http://en.wikipedia.org/wiki/Asterisk_PBX

- and SIP:

   http://en.wikipedia.org/wiki/Session_Initiation_Protocol

-- 
Tor Olav
http://subcube.com

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