It's a network marking system. I listened to the recorded message and it sounds like a scam to me! I'm guessing that someone I know got in on the scam and entered my number.
Just got a call from this number, claiming to have some "opportunity" to make 2 to 5K a month. No selling, no cold calls, etc. When did this crap start happening? I never used to get calls like this before. Must have found some loophole in the National Do Not Call registry or something!