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The functions
Double call
Switching on double call
Lift the handset. You will hear an acknowledgement tone.
Replace the handset.
Switching off double call
Lift the handset. You will hear an acknowledgement tone.
Replace the handset.
18
Enter the code for double call ON, e.g. star key, 34.
Enter the code for double call OFF, e.g. #34.
Integral 33
Continued
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