I believe this is a bug by Apple engineers, but they never pay for their mistakes

Make sure PKPushRegistry is called in the main thread and the delegate queue is set to the main thread Make sure that Callkit reportIncomingCall is called in time in the didReceiveIncomingPushWith callback. If it is not called multiple times, it will be blacklisted by the system.

demo has been uploaded：https://github.com/matrxcrystal/CallKitDemo

Please implement the CXProviderDelegate protocol and call the action's fulfill method - (void)provider:(CXProvider *)provider performSetMutedCallAction:(CXSetMutedCallAction *)action {   [action fulfill]; }