Refer to the exhibit. Users at a company located in New York cannot place calls. The New York gateway is configured with a T1 ISDN PRI card with 24 channels. The engineer runs the show isdn status…

Increasing the number of timeslots is related to capacity planning, not resolving an administratively down interface blocking all calls.

Changing the switch type is a configuration setting that should match the telco provider; it's unlikely to be the cause of an entirely non-functional ISDN link if it was previously working or if the primary issue is a shut interface.

The show isdn status command provides information about the state of ISDN interfaces. If users cannot place calls and the output indicates the ISDN interface or controller is down or administratively shut down, the no shut command, executed within the controller t1 interface configuration mode, is necessary to bring the interface up and enable it to process calls.

Changing the card type from T1 to E1 is physically impossible and fundamentally changes the signaling, which is not a solution for an administratively down T1 interface.