Xblue Networks PCS digital User Manual page 27

When the process is complete, remove power from the base unit by
unplugging port 1. Place the dipswitches back into the "Normal
Operation" mode, by placing all switches up or off position.
Because the de-registration process is initiated from the base unit, the handset remains
passive and will update once the de-registration process is complete. To confirm that the
de-registration process is successful, the de-registered handset(s) will display:
Wireless Key Telephone Handset
1 2 3
ON
(( ))
PLEASE
REGISTER!
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