Appendix
Deregister handsets/headsets
If you want to replace a handset or headset, or reassign the designated handset number of a registered handset, you must deregister all handsets and headsets that are registered to the telephone base. Then register each handset and/or headset you wish to use individually.
To make deregistration easier, read all of the instructions on this page before you begin.
To deregister all handsets:
1. Make sure that all handsets are out of the telephone base and handset chargers before you begin deregistration.
2. Press and hold 
/FIND HANDSET on the telephone base for about 10 seconds until the IN USE light flashes.
3. Quickly press 
/FIND HANDSET again. You must press /FIND HANDSET while the IN USE
light is still flashing. The IN USE light flashes for about five seconds. If the light stops flashing, start again with Step 1 above.
4.All system handsets show Put handset on BASE to register and all headset 
lights flash slowly and alternately in red and blue. You hear a confirmation tone when deregistration completes. The deregistration process takes about 10 seconds to complete.
If the deregistration process is successful, you hear “Not registered” through the headset earpiece when you press 
on the headset. If deregistration fails, you may need to reset the telephone and try again.
To reset:
1.Press and hold OFF/CANCEL or place the handset back in the telephone base.
2.Pick up the registered headset and press the RESET inset button with a paper clip or similar object.
- OR -
•Unplug the power from the telephone base, then plug it back in.
• You cannot deregister the handsets and headsets if any system handset or headset is in use.
•Even if the battery is depleted, you can still deregister the handsets by following the steps above.
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