Appendix 
128
Deregistering handsets
Notes:
f If the deregistration process fails, you may need to reset the system and try again. To reset, unplug 
the power from the telephone base and plug it back in.
f You cannot deregister the handsets if any other system handset is in use.
f Even if the battery is depleted, you can still deregister the handsets by following the steps 
mentioned above. After the handset is charged for at least ten minutes, the screen shows To 
register HS, see manual.