Telephone carriers

Telephone carriers Editor's Picks

How Does Telephone Number Routing Work?
Before a telephone company can assign telephone numbers, it must first purchase a block of numbers from the North American Numbering Plan Administration's registrar, a company known as Telcordia. Telcordia generally assigns an entire block of 10,000 telephone numbers (one area code and prefix combination, known as an NPA-NXX), though... more »

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