We just let it ring, and of course they didn't leave a message when prompted to. If you get any call that has a city & state on the call ID instead of a person or company's name, you can be pretty sure it's not worth answering.
Caller ID said "Unavailable". Area code is from New York. I don't know anyone named "Unavailable", & I don't know anyone from New York, so I didn't answer. The (scum sucking scammer robo) caller hung up when my answering machine kicked on.
The Do Not Call list works.
The Do Not Call List is NOT a call blocker!
Perhaps you should read what it really does!
http://www.consumer.ftc.gov/articles/0108-nat ... registry#basics