I suspect you need a tech to pull the log files and see what has created the issue. This can be done remotely and should not require a tech on site to get the information they need.
see attached:
A115 ALARM System History Frozen Due to a Software Exception
FIELDS: None.
CAUSE: The system froze the System History automatically because a software exception occurred.
ACTION: Use Database Programming to save the database and obtain the CP Error Information. Contact
Inter-Tel Field service with this information.
FSACTION: Report the problem to the engin