1. The other end is voice activated. If you don't say anything. The other side will hang up by the machine. The phone will ring again sometime later. You have to talk for the voice recording the start.
2. The other side is just a harassing you.
Try to find out.
sometimes I receive sales call, sometimes nobody answer my 'hello' at all, just dead silence on the other side!! :flaming: :flaming: :flaming: :flaming: