Connecting the missing ring wire to your telephone extension socket
Replace the cover to both the BT master socket and the extension socket. Plug one of your BT TwinTalks in to the extension socket you have just fixed.
Plug a phone into the BT TwinTalk at the extension socket you have just fixed. Lift the handset to make sure you can loop the line and hear a dial tone.
Now you can test
your BT TwinTalks, or view the steps again by clicking on the blue arrow: