Internet Phone Company Sues AT&T Over Trademarks

In a move that underscores the rising stakes in the VoIP sector, broadband telephony upstart Vonage is suing AT&T, charging that a competing service launched by Ma Bell infringes on its own brand. Filed in U.S. District Court in Trenton, N.J., the suit claims that AT&T's new "CallVantage" offering, and some of the Web sites registered to support it, sound too similar to Vonage's corporate name and could confuse consumers.