To ring or not to ring

        public static void Main(string[] args)
        {
            //Initialization skipped
            ua.CallManager.IncomingCall += CallManager_IncomingCall;
            ua.CallManager.Ring += CallManager_Ring;
            //Loop is skipped
            
        static void CallManager_Ring(object sender, RingEventArgs e)
        {
            System.Console.WriteLine("Call {0} ring event.", e.CallId);
            var action = e.RingOn ? "turn on" : "switch off";
            var toneType = e.IsRingback ? "a ringback tone" : "a ring sound";
            System.Console.WriteLine("========>>> {0} {1}", action, toneType);
        }