Thanks very much for the reply.
(1) Check the impedance of the bell. Its likely to be 1k ohm, so add a resistor in series with it to bring it up to 4k ohm ( this is not too critical, a 3 or 3.5k 1/2 watt would be fine) Yes it seems to be 1k if I remove strap between 1 - 3 (wiring diagram) and fit the 3.5k resistor in its place will that be OK?
(2) You need to disconnect the phone ring cap ( marked 2 on the diagram) at terminal 3 but leave the connection to the bell and the rest of the phone in place. Blue wire I hope as I have cut it off
(3) connect your lead to the phone so that the bell is connected across the out of service resistor in the master socket, and the ring cap in the master replaces the ring cap in the phone.Not to sure what you mean here, if I have BT plug connections 2(
Green) and 5(
Red) connected to 1(A) and 4(B) on phone is the right?
I was only going to use two wires, i.e. no ring ((3) Disconnected at master socket) wire connected and use a ADSL filter to provide the ring function.
I could have ring wire (3) from ADSL filter connected to (3) connection in phone.
Could you explain why you have to have the higher impedance and the capicitor disconected, I work better when I know why something has to be the way it is.