Getting started
Replace a headset
You may need to deregister your headsets if:
•You have already registered the headset and now wish to register your headset to a different AT&T DECT telephone.
•You have registered the maximum number of headsets and need to replace one of them. You must first deregister all headsets, and then register each headset you wish to use again, one at a time.
Please read carefully through all the instructions on this page before beginning the deregistration process.
Deregister all headsets from an AT&T DECT cordless telephone base
1.Press and hold 
/HANDSET LOCATOR on the telephone base for about 10 seconds until the IN USE light starts to flash, then release the button.
2. Immediately press /HANDSET LOCATOR again. You must press /HANDSET LOCATOR while the IN USE light is still flashing. (The light flashes for about five seconds.)
It takes about 10 seconds to complete the deregistration process. The 
light flashes slowly in red and blue when the deregistration process is successful.
3.To register the headset(s) to the telephone base again, follow the registration instructions on page 9.
NOTES:
•You cannot deregister the headset(s) if any system handset/headset is in use.
•Even if the battery is depleted, you can still deregister the headset by following the steps above.
•The button used for deregistration on your cordless telephone system may be different. Refer to your telephone user's manual for detailed information.
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