V take the number and google it. If it's a buisness it will come up, hell if it's not unlisted it will come up. Try your home phone number, it will probably come up with your name and address, it's kinda creepy.
I tried.. doesnt show a business name.. but there is a site saying that other people are getting the call and they just keep calling, so thats why I said it was probably a bill collector.