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@stevo_com
It could also be the switch down stairs not calling your handset. Terminal 6 (blue wires) is Common. CA is call and 9 is lock. 1 & 2 are speech in and speech out respectively.
Can you have a conversation with someone downstairs over it?
I would test across 6 and CA while having someone downstairs press your button to see if you get a signal.
It should only be 12 or 15V. The whole thing should be fed by a power supply connected to the mains, but what those wires carry should be low voltage.
Again, I'm just a dick on the internet, but the above it what I got from google.
https://www.hobbielektronika.hu/forum/getfile.php?id=288355
And working out your terminals from this image