I'm pretty sure you have to re-register for Do Not Call every 5 yrs....at least that was so when I originally signed up. I love to ask them "Are you aware that I am on the Federal DNC list and also on my state's DNC list.?" They can't seem to hang up fast enough, and most will say "I'm sorry" before doing so. But most of the calls now come from outside USA via patches that can jump 2 or 3 times--there is no way to track them down, nor could FCC prosecute. I've recorded a message that "we are not taking calls at this time. Leave a message if you want your call returned." Of course there is never a message, unless it's a political call. When that season is upon us, I record, "If this is a political call & you use my answering machine for your message, you can be assured that you will not get a vote from this household!" I've had spiels that lasted so long it filled up my machine, and we'd return from vacation to this drivel.