Correct go to Ctrl-C then Q for Pri Parameters
At the bottom you will see the switch type:
01 – AT&T Custom
02 – National NI–2
03 – DMS–100

5E is AT&T Custom I do believe. To change just hit enter until you are down there and the I - D key changes value.
And remember this:

Parameters for the PRI circuit are programmed on the PRI Parameters screen. This
screen requires password level 8 for access. Changes made on this screen do not take
effect until the PRI card is reset.


mjc