AASTRA 4422 IP Office for MD Evolution User Guide - Manual (Page 122)

Services Reserved for Attendants
MD Evolution – Dialog 4422 IP Office 122
Major System Alarm Message Indication
On your attendant’s position, you may also receive an indication
that there is a major alarm within your telephone system.
From an idle position and active general calls acceptance mode,
you are notified by the display of “AL” on the second line of your
position’s screen.
You can then report this to your system administrator. Obviously,
the sooner, the better.
15:49 05 jun 2008
AL
AT 405