robo-begone

Requires an answering machine or answering service that allows custom messages. Simply begin your answering machine message with three custom tones followed by a 1 second silence then your regular message. Most telemarketing machines will detect the tones and disconnect from your line upon hearing the tones. They will usually also automatically delete you from the call list. See:http://en.wikipedia.org/wiki/Special_information_tones for the exact tones to use.