This number calls and nobody leaves a message.  Don't know who it is!

It calls and beeps..then they hang up

Called the number back. Answered with "thank you for calling thedailyjackpot.com." An automated system running a "survey." Claim to enter you in a daily drawing for answering their questions They are apparently a consolidator that, depending on how you answer by pressing 1 or 2, passes you off to purveyors of some very familiar scams: "free" cruise to The Bahamas, lower your interest rates, medical alert devices, etc. See http://www.thedailyjackpot.com to see how they  operate.