First things first, don't just change the protocol, you'll break things. Your end and the telco must match. You should check with your telco to find out what ISDN protocol you're running.
To see what protocol your DS1 is configure for, display the DS1 config screen:
display ds1 01a16 (the 01a16 is specific to my switch, set yours accordingly)
The "Protocol Version" field will probably be "a" or "b". "a" is the AT&T protocol, "b" is Bellcore or NI-2.
Before you go to all this trouble, you might find out if your LEC will even deliver name over PRI. I spent weeks trying to find the right person that knew it could be done. They kept telling me "no" and that was never good enough for me. But if your LEC won't deliver name, the rest is an exercise in futility.
Good luck.