Okay, this one is dodgy!. I called this number back on the landline and got a recorded message from Optus saying this number is disconnected. In the background you could hear the ringing as you would when you make a call and waiting for it to be answered. About 5 minutes after hanging up, we had a call to the landline from the same number. When we answered and the sad son of a bitch hang up.. if you get this number BLOCK IT!!!!!!