Panasonic KX-T336 System Reference Manual page 1490

3.36 Digital trunk failure (RAI signal reception)
Error Code
Possible Cause of
the malfunction
Countermeasures
Note
71xx xx=01 to 42 : Slot number
T-1/E-1 card (physical number xx) received the RAI (Remote Alarm
Indication) signal sent from the Central Office.
Ask the T-1/E-1 carrier to check the line conditions. Or, check the equipment
in other switching system which your T-1/E-1 lines are connected with.
None
14-E-37-2
(70695)