Even though I have my cell on do not call list this call keeps coming in. It looks like others have found that this number is a scam/prank/telemarketer. I did not answer so I don't know for sure which one.
Scammers don't care your number is on the DNC list. If they can't bother to identify themselves on the caller ID or leave a message, it's not worth your time. Just block and ignore.