What is CFU (Call Forward Unreachable)?

When the device is not accessible, Call Forwarding Not Reachable permits sending all incoming calls to an alternate phone number. Call forward inaccessible permits to forward phone lines to another number of choices in the event administrations are down, without having to call into a customer care number for support. It is a feature established ahead so that if for any condition your calls cannot associate, a line was cut, or the phone system is down, that call will automatically forward to a pre-assigned number that the user has picked.