First youll need to check your type of master socket. If you have more than one socket the master socket is the one that will feed any extension sockets.
How To Fit An Adsl Faceplate On Your Nte5 Telephone Master Socket
Bt phone wiring diagram master socket. This is usually what an extension socket looks. Therefore in most home installations where sockets are connected to each other by a single pair you will only ever use the first blue pair. Fwiw as your consumer panel shown in photo 3 has no extension wiring connected to it if it did it would be wired on 2 and 5 of the panel then your filtered faceplate isnt going to achieve more than what a regular broadband filter would the block type that would plug into your master socket and your router and phone would plug into it. This is the main telephone socket where the phone line enters your home usually found in the hallway near the front door. For every cable at each socket cut the sheath at the end of a cable about 13mm 12 in with a pair of side cutters and expose the white nylon ripcord. This is where the broadband signal is strongest before it goes through any other home wiring which could cause interference.
For much more detail then please watch my longer 22 minute. Wiring the sockets start at the last socket and finish at the master socket. My master socket has one socket my master socket has two sockets. Hi this video is a very quick example of how to wire up a nte5 master socket as found in the uk on bt and virgin media telephone lines. Its always best to connect your bt hub to the master socket if you can. Click on a link or picture.