Are you wondering if your cable VoIP phone will work if the electricity goes out? The answer is - it depends. Several cable companies offer battery back-ups for their phones to help out with this issue. Cox and Comcast Corp. include a battery with their voice adapters that will provide power to the phone for four to eight hours. Time Warner has a battery backup for their service, but only includes it with their service if the customer asks for it. Cablevision charges $5 to its customers for a backup battery.
Though the backup batteries do offer a small sense of security, a "landline phone system remains the most reliable option during a power outage," according to the article Will my phone work if the power goes? "The central offices, or switching stations, have backup power, and supply enough power through the lines to power corded phones."
