Video call is not receiving when app is killed in iOS 15 and above

[komalKmphitech]

The call is not received (CallKit UI is not showing) when the app is killed, It is received when the app is in the foreground & in the background.

The bug scenario for User 2:

1. User 1 is calling User 2
2. iOS App is in termination state (killed)
3. Call UI is not shown
4. Call rejected by User 1
5. Now open app & call is receiving (CallKit UI shown) however call is terminated by User 1

The call is working in

1. Foreground state
2. Background state
3. below iOS 15 (All states)

Not working in

1. Killed state in >= iOS 15 only.

Capability: Background modes

1. Audio, airplay
2. VoIP
3. Background fetch
4. Remote notifications

I face this issue every time, also I'm unable to test calls in development mode. For testing, I have to make an AdHoc build & then I can test. In development, mode calls are not received in any scenario.

I want to receive call-in killed state also.

Versions:
TwilioVoice: 6.2.0
TwilioVideo: 4.6

iOS versions: >15.0
iOS devices: Any