I have customers having an issue where they are on a phone call for a long time like 1+ hours and then a second call rings at their phone and they hit that extension to put the first long call on hold and the phone freezes. They have to reboot the phone to get it to do anything.
Phones are at 18.104.22.168 firmware. Not sure what we can do to fix this. I would imagine it couldn’t be an issue with the PBX but we are using 3cx if that helps.