With my 2565 HKMS and also another but smaller Call Director (Northern Electric) the ringers were just giving a very low ring (every ringer positions tested), just one small movment instead many high I could have with a normal phone. The most important thing I can say is that I had to reverse the wires to have it. That means when I plug the phone on the wall, there's a first ring.
The Call Director is a used unit purshased from ebay.
Is there a way to modify easily the frequencies to meet the 30Hz of the US phones ?
