The XE0068DT is an FCC approved phone line interface that can answer a phone line, make a call, recognize the DTMF tones and with an Arduiino WAV library, you can play voice or sound back to the caller. WAV files are saved to the micro SD card included on the shield.
Create an auto Dialer for an alarm system.
Create a robo-Caller to update all your friends how your life is going.