Single ring hang up, just some lowlife scammer trying to get around the DNC list by having you call them back. Once you call them, they have established a business relationship and are no longer subject to DNC.
Saw the number. Rang twice on my Samsung Gear S2 which is a brand new number and NO ONE that I know has it especially from OK. Rang twice and hung up. I don't answer unknown numbers anyway so good to know it's just a scam type of call.