This number calls at any given time (they especially like to call after 9pm on Sunday). I finally called back to see what was up and it said it was some state troopers association that wanted me to donate some money to them. You can press "2" to get your number removed from their call list, but I just did that, so I can't speak for whether it works or not.
Beware, this is a criminal scam!!! The caller (who is actually a recording) claims to be collecting the fallen police officers' fund. You will also get a call from the same number with 30 as the last two digits instead of 29. Block them!