Panasonic KX-FP362BX Service Manual page 79

6.6.5.1.4. THE UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE
CROSS REFERENCE:
TEST FUNCTIONS (P.50)
ANALOG BOARD SECTION (P.105)
6.6.5.1.5. THE UNIT CAN COPY, BUT CANNOT EITHER TRANSMIT/RECEIVE LONG
DISTANCE OR INTERNATIONL COMMUNICATIONS
The following two causes can be considered for this symptom.
Cause 1:
The other party is executing automatic dialing, the call has been received by this unit, and the CED or DIS signal response time
is too long. (In most cases, this unit detects the CNG signal and can respond to CED or DIS.) (According to the ITU-T standard,
the communication procedure is cancelled when there is no response from the other party within 35 sec, so that the other party
releases the line.)
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KX-FP362BX