After reading about using a rotary dial phone with Obi202, I bought a Dialgizmo and dialing works fine with it.
However, the phone doesn't ring. In order to eliminate Dialgizmo from the equation I connected the rotary dial phone (Bell phone from 1979) directly to Obi202. It still doesn't ring. I increased the ringing voltage to 80V (20Hz, sinusoidal) and the phone doesn't ring. A regular/current phone rings fine.
Is there any other setting I should adjust in order to get the phone to ring?