Cox Communications launched its VoIP service in Santa Barbara and Palos Verdes, Calif. Cox is now offering the service in every single one of its markets, though it has yet to make it available to every single one of its subscribers.

Cox previously this year introduced its VoIP telephony service to Northwest Arkansas; Sun Valley, Idaho; and Cleveland, Ohio. The company said more than 1.9 million households and 150,000 businesses subscribe to Cox Digital Telephone.

Separately, ADT Security Services, a unit of Tyco Fire & Security, announced it recognizes Cox Digital Telephone as a primary method of alarm transmission – only in those markets where Cox provides its VoIP service over a private, managed IP-based data network.

David Pugliese, Cox’s vice president of product marketing, said ADT’s announcement today further validates our collective commitment to customer safety.