I was trying to do some other task in VoIP didReceiveIncomingPushWith delegate and it suddenly stop getting called anymore on iOS13. Then I found this note on Apple doc.
Thats fine but what I can do to reopen/unblock this so that I can implement callKit now. Because its completely stop delivering anymore in both production/development mode.
On iOS 13.0 and later, if you fail to report a call to CallKit, the system will terminate your app. Repeatedly failing to report calls may cause the system to stop delivering any more VoIP push notifications to your app. If you want to initiate a VoIP call without using CallKit, register for push notifications using the UserNotifications framework instead of PushKit. For more information, see UserNotifications.