Send pre-recorded voice message to multiple users (over landline)

I need a simple program which can send voice messages to multiple users via landline (modem). So it would be like I will have a .wav file which will be used by the software and I will enter a list of phone numbers to whom this message will be sent. The software will communicate and send this recorded message one by one to each number using the external modem. The message will start playing as soon the person picks up the phone and the call should hang up once its done.