Yes, there is a way to disable the T1 port from accepting loop-up requests:
Under MODULES go to the T1/PRI module in question.
Go to the MENU for this module and hit <ENTER>.
Under MENU go to CONFIGURATION.
Under CONFIGURATION change the LB ACCEPT setting from ACCEPT to IGNORE.
Then back out to the main menu.
That specific T1/PRI port will no longer accept a remote loop-up and will have to be put into loopback locally if desired.
Hope this helps,