Scam call from Ivory Coast in Africa. I answered the call without checking the phonenumber first, but got a strange bleep and then the person/call computer on the other line hung up.
I would strongly advise you from ringing these people back. If you choose to do so, I know that they may use your phone to call freely and you will be left with huge phonebills. So don't call them back. I am posting this to warn other people.