Smartwares (Elro) IB61 and Nuki Opener

I have a Smartwares IB61 (earlier Elro IB61).
It has a 3 cables:
Black: GND
Red: VDD
White: Audio

Can you help me please to get it work with the IB61?
What information do you need else?

Thank you very much!

Regards Patrick

A Foto of the inner wiring of the intercom.