CYFRAL CCD-20 2-wire analogue Intecrom

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Hi, everyone!
I have analogue Intercom.
Tested to shortcut this 2 wires when someone call, nothing happens.
So any ideas about how it could be connected?

429271BD-8360-448D-9D7D-793276965F18_1_201_a
429271BD-8360-448D-9D7D-793276965F18_1_201_a3024×4032 2.73 MB
D353D366-1708-4093-B7C9-897F0886C8C2_1_201_a
D353D366-1708-4093-B7C9-897F0886C8C2_1_201_a3024×4032 1.98 MB
8990B0A0-6050-4111-9DE0-4993434CCDDF_1_201_a
8990B0A0-6050-4111-9DE0-4993434CCDDF_1_201_a3024×4032 1.78 MB
AB80B93B-1330-462A-9CB9-991C27ADF28B_1_201_a
AB80B93B-1330-462A-9CB9-991C27ADF28B_1_201_a3024×4032 1.67 MB
2020-12-19 20.28.05
2020-12-19 20.28.05960×1280 401 KB