But to be absolutely sure undo the two screws on the front of the master socket and pull the front off towards you and you'll see another telephone socket behind the front panel. plug your phone in there and try it before calling BT.
I've unplugged everything and connected new phone and still have 'ring trip'. Phoned BT who tested the line with everything unplugged. Their tests told them it was not my equipment and an engineer will be out to investigate at no cost to me. Hopefully that will be it resolved!