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Vonage received a patent last week on virtual numbers, something that AT&T also used to offer on CallVantage.
Basically, they've patented the process of using SIP to do what a Foreign Exchange number did for years in the PSTN, that being to have a local number in one place, and have it ring in another. The big difference is with IP based calls, the cost is next to nothing compared to the FX numbers that you paid mileage on in the PSTN world.
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