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Posted by Ted Schadler on March 12, 2010
You can use Internet protocols to make phone calls inside your own network. And you don't have to pay for the minutes. But you can't do the same thing with a business partner. Instead, you have to pay a carrier like BT or AT&T to carry the phone call over the public switched telephone network (PSTN).
(PSTN is an analog network born in 1878 when Bell opened a switching office in New Haven, CT. It's done us proud, but it's time to move to a digital network.)
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