void OnGlobalStateChanged(IntPtr lc, LinphoneGlobalState gstate, string message)
		{
			if (linphoneCore == IntPtr.Zero) return;

			if (GlobalStateChangedEvent != null)
				GlobalStateChangedEvent(gstate);
		}
 private void OnGlobalStateChanged(LinphoneGlobalState state)
 {
     Console.WriteLine("Global State changed: " + state);
 }