SCOTTSDALE, Ariz. - Worldwide cable telephony service revenues rose from US$4.5 billion in 2004 to US$5.6 billion in 2005, and are projected to reach US$10 billion by 2009, reports American research firm In-Stat. "The widening availability of VOIP-based cable telephony services has resulted in thousands of new cable telephony subscribers for operators like Time Warner Cable and Cablevision in the United States, Videotron and Shaw Communications in Canada, and Liberty Global in Europe," says the In-Stat release."The key attraction for cable operators is the cost advantage that VOIP offers in comparison with circuit-switched service," says Michael Paxton, In-Stat analyst. "Based...