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Leapfrog Communications is a Indianapolis, IN-based company in the Telecommunications sector.
Verizon Communications Inc., commonly known as Verizon, is an American multinational telecommunications conglomerate and a corporate component of the Dow Jones Industrial Average.
E-Tel Systems Corporation is a Sterling, VA-based company in the Telecommunications sector.
callingo is a Chantilly, VA-based company in the Telecommunications sector.
Conference Call Service is a Mountainside, NJ-based company in the Telecommunications sector.