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AT&T News Release, 2004-04-26, AT&T's CallVantage Service Expands ...
Apr 26, 2004 ... BOSTON -- AT&T today launched the next phase of its residential Voice over Internet Protocol (VoIP) phone service, called AT&T CallVantageSM ...
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AT&T News Release, 2004-04-26, AT&T's CallVantage Service Expands ...
Apr 26, 2004 ... AT&T CallVantage Service is different than traditional phone services because through the use of IP-based networks ... All that is required for service is an easy-to-connect, plug-in telephone adapter (TA) provided by AT&T, and a bro
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