How obtaining the Call Status without CallKit

iOS Deployment Target 12.0. I want to used 'CTCallCenter' from CoreTelephony , xcode told me 'CTCallCenter' was deprecated in iOS 10.0: Replaced by CXCallObserver from CallKit.framework. but china prohibited to use the CallKit.framework. i just want to obtaining the Call Status, no phone UI, no VoIP. so i want to know how can i do