VTech DECT 6.0 CS6219-4 - Manual (Page 7)

4
Getting started
Replace a handset
If you want to replace a handset or reassign the designated handset number
of a registered handset, you must deregister all the handsets and then
individually register each handset.
To make deregistration easier, read all of the instructions on this page before
you begin. To deregister all handsets:
Press and hold FIND HANDSET on the telephone base for about 10
seconds (until the IN USE light on the telephone base turns on and starts to
flash), then release FIND HANDSET.
Press and release FIND HANDSET again. You must press FIND HANDSET
while the IN USE light is still flashing. The IN USE light flashes for
approximately seven seconds.
All system handsets show
CONNECTING... The deregistration process
takes about 10 seconds to complete. All handsets show NOT REGISTERED
when the deregistration completes.
If deregistration fails, you might need to reset the telephone and try again.
To reset:
Pick up the registered handset and then press /FLASH.
Press OFF/CLEAR and place the handset back in the telephone base.
-OR-
Unplug the power from the telephone base, then plug it back in.
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You cannot deregister a handset if any system handset is in use.