ELVOX 940: compatibility?

Hello all, does anyone knows if ELVOX 940 is actually compatible?
Has anyone done some integration about it?
I know that externally is similar to 902 but internally the wiring are not the same.
Can someone help me? I am totally fresh at this.
Thank you.

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Ciao Paolo,
I tried to connect Nuki Opener to Elvox 940a but it is not working… therefore I believe it is not compatible…
I followed the wiring of Elvox 870/837 which looked the same as 940:
1.linea chiamata digitale
3.linea telefonica
5. 13.5 V D.C.
But it is not working.
Please let me know if you had any success.