Question about an office prank...

[Xcalibur]

Tomarrow at work we are planning to play a prank on the secratary using sound clips of arnold schwarzenegger's voice. We are going to make the call using dialpad.com, but the problem is i do not know how to get it to pick up the output of the sounds, being when i click the sound file, i dont know how to configure it so that it sends that sound. Can anyone help?