Panasonic KX-TD500 System Reference Manual page 1507

1.05 Remote Alarm
Description
When the system detects a problem during on-
line communication, an error message appears
on the screen of the remote maintenance device.
For remote access, RMT card must be installed
in the system, and a data terminal and modem
are required at a remote location.
Remote Configuration
Main Unit
Central
Office
Programming
To execute this feature, set "Remote Alarm" to
"Y" and register the telephone (Modem) number
of the remote administration device in
"Destination Address".
System Programming
"System-Operation (2/3)",
Remote Alarm,
Destination Address
Data Terminal
Modem
Reference
VT Dumb
10-D-1.02 11-C-4.00
16-D-3
Conditions
Setting "Remote Alarm" to "Y" is not available if
the RMT card is not installed.
All system-detected error messages are
displayed in the error log, but for "Local Alarm",
and "Remote Alarm", some error messages are
displayed and some are not.
Refer to Section 15-D-2.03 "Background
Diagnostic Error List".
Command Format
PRG>OPR AT2