Ring intercom can not catch very short rings

I have an analog Urmet 1131 with A cable. If rings take less than approx 1s, nothing happens. If more than 1s the device works well and there is a notification. Many people ring shortly and I miss many rings.
How to solve this issue?

Hi @RomanSet . Welcome to the Ring Community!
We’d be happy to take a closer look at this with you. Please send us a picture of the wiring and another picture of the case of your current intercom confirming the Model. Our team will then be able to investigate this further. We look forward to hearing back from you.