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You may need to replace the batteries.
I cannot transfer a call.
Make sure the other handset is within range of the base unit, and is not busy on a call.
Make sure you are keying in the correct number for the other handset.
No display on LCD screen.
Make sure the batteries have power.
I cannot register handset to base
Make sure the number of handset registered to base is less than 3.
Check that the base unit is not near other electrical equipment, such as TV or computer
Technical details

Full DECT GAP Compatible system

Standard

Frequency range

Channel bandwidth

Modulation

Operating range

1.88 to 1.9 GHz
1.728 MHz
GMSK
Up to 300 m outdoors;
Up to 50 m indoors
Standby time: 90 hours
Talking time: 10 hours