I had a problem with VoIP and Standard notifications with iOS 14.X only devices. My scenario is as follows: I have two iOS devices: User A, User B Interrupt the internet connection at user B User A call User B via my VoIP application Wait 15 seconds and activate the internet for B Issue: VoIP notification of the call is not received for User B Side effect: Randomly after this scenario, User B may no longer receive VoIP and standard (for text) notifications until I reboot the device. This side effect is more common when I switch to LTE 7/10 When I switch to WIFI, I was able to reproduce it 1/20 PS: If user B is using iOS 12 or iOS 13 it works fine.

I had a problem with VoIP and Standard notifications with iOS 14.X only devices. My scenario is as follows: I have two iOS devices: User A, User B Interrupt the internet connection at user B User A call User B via my VoIP application Wait 15 seconds and activate the internet for B Issue: VoIP notification of the call is not received for User B Side effect: Randomly after this scenario, User B may no longer receive VoIP and standard (for text) notifications until I reboot the device. PS: If user B is using iOS 12 or iOS 13 it works fine.