The present invention comprises four principle elements: (1) a telephone instrument; (2) a computer; (3) an automatic dialer; and (4) a telephone line. These elements allow for automatic dialing of local and long distance calls in the United States, as well as automatic dialing of international calls....http://www.google.fr/patents/US5917904?utm_source=gb-gplus-shareBrevet US5917904 - Automatic area code detector and dialer
