No need to build a "terminator," just get a little digital recorder, find an unworking phone number and record the "the number you have reach etc., message, and if you have caller ID, when you see a number you don't want, pick up the phone and play that message, it's the tones that does the trick. Then hang up. I just picked up the recorder today, and am going to try it.
I didn't answer this number, I don't answer unknown numbers, if I miss something - SO BE IT!!!
Message repeatedly saying how my company can appear in the top Google search results if I pressed "!" to take advantage of the caller's services, or I could press "2" to remove my name from their call list and let the offer pass along to my competitors.
Automated caller message never identified the company represented.