Is it an 'Entryphone' or some other make?

If it is Entryphone then just ring them up and get a new panel.
The older systems use 4 common wires L,P,B,3 and A is the call wire.
newer systems can be run on a twisted pair cable.
There are sh1t loads of makes, Fermax, Aiphone, BCT, Terraneo, Eagle,
Challenger, Defender etc etc and there is little
or no inter-compatability. HTH


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