Existing Cablevision digital-phone customers can add up to three additional lines for $14.95 per month each. Each additional Optimum Voice line has its own dedicated phone number and provides unlimited calling to the United States, Canada and Puerto Rico. The service includes features like caller ID, call waiting, voice mail and directory assistance.
By comparison, in the New York area, Verizon charges about $44 for an additional phone line with unlimited domestic long-distance and caller ID, call waiting and voice mail.
Cablevision already offers business customers up to eight lines with Optimum Voice.