That's the key but when a previous or current vendor does call you can tell them to add you to their do not call list and they have to add you. I actually did that with Discover card and Dish to stop them from interupting my dinner. Now I just need to figure out how to get the state and local govt to stop calling.
Voicepulse filters are beautiful thing. I can't even remember the last telemarketer call I've had...it's been over 3 years I'm sure.