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It looks like some of the equipment has a regular BT phone jack, so my guess is that you may use the 3 wires you use from the master socket to the rest of the house, but you should probably disconnect the the entire master socket. Tha components in the master socket may be bad for the system, and the old line in should definitely not be connected.
If you have an adapter with the typical American jack (RJ12) the 2 center wires could be fed into the 2 red and whit on your system. The wires from outside house should be disconnected, and the master socket will do its job to dived ringing. It does not matter where after the master socket you connect that wire.
dagskarlsen
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Yes, you are right. Of course you can take the phone” signal” from the router and feed it back into your extension wiring. Provided the incoming line( with broadband) is kept separate then it should( and indeed does. I’ve done it for customers a few times) work fine with existing legacy phones. Many newer phones don’t need the bell wire, so just a pair of wires will suffice in most cases.
In BT’s case the main reason for this change is the manufacturers of the “ modern” existing digital exchanges( some of which were installed in the early 1990s) are no longer supporting them after 2025, so the decision was taken to go VOIP.