Is this correct. All you need are wires to terminals 2 and 5 connected in your Master Phone Socket? I have a Dual Master Socket connected thus: Circuit 1 Green goes to terminal 2. Black goes to terminal 5. On Circuit 2 Orange goes to terminal 2. White goes to terminal 5. Do i still need the 4 wires as described. I no longer have 2 land line numbers in use.