Panasonic KX-TD500 System Reference Manual page 1415

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, a data terminal and modem
are required at a remote location.
Remote Configuration
Main Unit
Central
Office
Programming
To execute this feature, set "System-Operation",
Remote Alarm to "Yes" and register the
telephone (Modem) number of the remote
administration device in "Destination Address".
Installing the RMT card is required for this
feature.
System Programming
"System-Operation (2/3)"
Remote Alarm,
Destination Address
Data Terminal
Modem
Reference
VT Dumb
10-D-1.02 11-C-4.00
15-D-3
Conditions
Setting "System-Operation (2/3)" Remote Alarm
to "Yes" is not available if the RMT card is not
installed.
All system-detected error messages are
displayed in the error log, but concerning "Local
Alarm", or "Remote Alarm", some error
messages are displayed and some are not.
Refer to Section 15-D-2.03 "Background
Diagnostic Error List" for details.