We have a BT main socket which comes in from outside but we want to install a second socket in another room by using an extension kit. We don't want the sort of kit that you plug into the main socket as we have used that kind before and it looks really ugly. This time, we want to have the new extension wire connected inside the main BT socket.

Can anyone help me with what we have to do and also what equipment we need and where we can buy it from.

Many thanks.