Quickstart-calls-directcall-react-native calling screen not coming when screen is off

I am using this demo sdk version in my mobile, when I am trying to make a call from one device to another and another device screen is off then mobile rings only one time and notification also disappear within second. I guess callscreen should appear and stick until user Accept/Decline call?

Is this feature available in this demo sdk or should I have to made some changes to get this screen when the device screen is off?

This screen is not visible when device screen is off only notification appears for one second.