Doorbell 2 installation woes

Hi, it's a bit frustrating that there is absolutely no installation info for advanced users or engineers like me. What signal is sent through the wires in different chime modes??I have a mechanical chime that is rang with simple doorbell pushbutton switch that shorts the wires with 12,9VAC between them. All the Ring has to do, is to behave in the same way - short the freakin wires and ring the chime! It does not do that in any of the modes, which makes it useless in my setup. I need it to be able to act as simple pushbutton in case wifi goes down or if any other problems with transmission occur. Is this too much to ask? Do I have a faulty device?I have measured resistance between terminals and it stays around 240K in all three chime modes, when button is pressed. Please advise on what electrical behavior should be on the terminals in all three modes.