If enabled, replaces unavailable numbers with administrable strings for incoming and outgoing calls assigned to the specified trunk group. The display is replaced regardless of the service type of the trunk. Applies to BRI/PRI, H.323, and SIP trunks. Also applies to analog trunks if Analog Trunk Incoming Call ID is enabled and Receive Analog Incoming Call ID is set to any value except disabled. Available only if the Group Type is
