I called the number back and it didn't even ring. But it was connected. I have no idea who it is so I blocked it already. I would do the same if I were you!
Called me let it ring twice and hung up. From what I gathered on Internet searches it's a scam number where they use one of your local numbers so you answer the phone thinking its a friend or relative. Then tell you that you have one something in order to gain personal information.