These are a must have and hard to find item you will need if using an old GPO dial telephone on a modern two wire system. This unit takes a modern Voip output and converts it to a three wire to enable your old telephone to ring after change over from BT or Virgin etc. Simply plug in your dial telephone to allow it to ring again. 

            This is simply to bring back the telephone ring capability and nothing else.

Look at the socket you need to plug into and buy the socket required. The end you plug your telephone into is a UK female and the end into the Voip unit or socket is RJ11 as in photographs. 

     If you require UK to UK see my other listings.