New York-based Fusion also is trying to patent is eNumber and automated eNumber owner verification process, also part of its free efonica-branded VoIP service launched earlier this week.

Fusion has chosen 10 as the Internet Area Code, which it said enables it to recognize calls placed between its subscribers and designates it as a free VoIP call.

The company’s eNumber concept lets its subscribers register their existing landline or mobile numbers as their new VoIP numbers. And the company has a system to verify that the phone number registered belongs to the subscriber.

So, once a subscriber creates an eNumber by registering their phone number, then other subscribers can call them for free by calling that number with the 10 Internet Area Code. Without that area code, the call would be a traditional landline or mobile call with the typical fees.

In other words, by using the 10 prefix, Fusion subscribers can call other subscribers for free using their regular landline or mobile phone.

We believe that maintaining and supporting consumers’ normal calling habits will lead to broader worldwide acceptance of our efonica VoIP service and provide our subscribers with an easy and seamless transition to experiencing the many benefits of VoIP, said Fusion chief executive Matthew Rosen, in a statement.