Panasonic KX-TD816 User Manual page 219

6.1 Troubleshooting
Problem Remedy
A Power Failure occurred. When a power failure occurs...
The system and Panasonic proprietary telephones stop
all functions. Specific extensions are automatically
connected straight to specific CO (outside) lines. This
provides CO line conversations between the following
extension and CO lines:
KX-TD816
CO01 - Jack number 01
CO02 - Jack number 02
CO05 - Jack number 09 (not available for an ISDN line)
CO06 - Jack number 10 (not available for an ISDN line)
KX-TD1232
CO01 - Jack number 01
CO02 - Jack number 02
CO03 - Jack number 09
CO04 - Jack number 10
CO09 - Jack number 17 (not available for an ISDN line)
CO10 - Jack number 18 (not available for an ISDN line)
All intercom calls and features do not function.
When turning the power back on...
Your system restarts with the stored data automatically.
Memory is protected by a pre-installed lithium battery.
There is no memory loss except for Automatic Callback
Busy (Reserving a busy line) and Held calls.
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