Abstract: An Internet-telephone interface system is disclosed. The system provides a fully integrated system that permits the transfer of calls received over the Internet to the regular telephone net, and vice versa. Calls may be made via the regular telephone system or the Internet. The system includes an adapter for creating telephone signals based upon input signals, the adapter selectively coupling a microphone and speaker system with a telephone line and a computer using the created telephone signals based upon the source of the input signals. The input signals are from a telephone line and the adapter couples the microphone and speaker system to the telephone line. The input signals from the computer are signals from a sound device in the computer.