Here’s all you need to make your own “Telezapper” for free (more or less). First, download this tone (right-click and select “Save Target As…”) or hold your answering machine up to your speakers and click here. Then simply record your standard answering machine message. The trick to making it effective is to allow your answering machine to screen your incoming calls for approximately 2 weeks.
For those not familiar with the Telezapper, click here or go spend $50 at your neighborhood Radio Shack.