Internet telephony unit and software for enabling internet telephone access from traditional telephone interface

摘要

Automatic selection and establishment of a communications connection between a telephone device to a receiver device, including entering an address of a receiver device into the telephone device for initiating the communications connection to the receiver device, and automatically selecting a communications network for establishing the communications connection to the receiver device, and selecting the communications network from an internet-based network, a hybrid telephone/internet network, and a telephone network. Automatically determine network access capabilities of the receiver device based on the address of the receiver device, and automatically evaluate the cost of establishing a communications connection for each of the communications networks which the receiver device is capable of accessing. The communications network with the lowest cost is selected.