Just got a call from this number, I'm actually waiting for a call from Mississippi and answered it. The idiots couldn't even manage to try to sell me something. Dead air and a hangup.
Yes, if you call the number back, it asks if you would like to be placed on the DNC list to press 1. After you press 1, it apologizes for the inconvenience and then also tell you that it may take up to 48 hours for your number to be removed.