A method and system for communicating across telephone and data networks are disclosed. According to one embodiment, a computer-implemented method, comprises receiving a first call from a first user phone that converts the first call from a format of a first local phone network to a first digital call. The first digital call is transmitted over a large area data network. The first digital call is converted to a format of a second local phone network to generate a second call. The second call is transmitted to a second user phone over the second local phone network. A real-time bi-directional voice communication session is established between the first user phone and the second user phone.