I just installed delta chat on couple of my devices. It works great on most but I can’t receive the calls on one phone. Seems that it’s known bug but I can’t find the solution Help testing 2.49+ bugfix releases - #3 by nik
I can call others from that phone normally, but can’t receive calls on it - drops instantly to missed call. I tried calling it from multiple devices. All devices are on android 11 and Delta chat version 2.58.0. Tried multiple relays and fresh account - same thing.
Could you check if the clock on the phone that cannot receive the calls is synchronized and not in the future? Maybe it is simply a few minutes in the future (or one hour in the future because of the wrong timezone) and this is why it thinks all calls that arrive are old and have been made long ago.