I need to accept the call by tapping custom UI button.
From native push call screen system is notified by CXProviderDelegate method
func provider(_ provider: CXProvider, perform action: CXAnswerCallAction)
But how to notify CallKit with custom UI?
E.g. I can notify CallKit about ended call by method
reportCall(with UUID: UUID, endedAt dateEnded: Date?, reason endedReason: CXCallEndedReason)
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