When active, callers trying to reach you will usually hear a busy signal, a recorded message saying "Subscriber is not available," or a message stating the call is barred. You will receive a notification of the missed call.
The feature means that your phone is configured to reject all or specific types of incoming calls. It is typically part of Call Barring (or Call Blocking) services, controlled either by your phone's settings or your mobile carrier. incoming calls are barred