If AE gets in a loop it can log hundreds of calls which then need to be deleted from the database.
Take a full backup of the database before running these statements, and all users logged out of HelpDesk.
The statement is the same each time but needs to be run against the following four tables:
delete from = '000000000000000xxxxx' and callid_hdw <= '000000000000000xxxxx'
The first call id is the lowest number call logged by AE and the second is the highest.
HD Classic all versions