Hammer phones with Android OS stops notifying in app after a time

[MauriceA]

We use hammer phones with the 3cx app connected to WiFi. When the phone isn't being used for a time, incoming phone calls don't trigger a notification which means the phone won't ring and users will miss calls. After 15 minutes users will receive a notification of the missed call.

The problem resembles a power settings issue, but all settings regarding this are set in a way that this shouldn't happen.

Are there any people using hammer phones with Android version 13, kernel 4.19.191 or other brand phones with the same Android version experiencing the same issue?
Any suggestions how to check all energy settings of the android system and the 3cx app settings from a CLI?

Attached are screenshots of the current (relevant) settings.

 

[ThomB_3CX]

Hi, as I can see, you have followed the trouble shooting page for Push.

All looks fine from your settings.

Is the PBX and devices correctly syncronized with the correct date? This can cause issues.

If all good, best thing to do is send us verbose logs for us to review via PM