Appendix C
Adding and registering handsets (optional)
NOT REGISTERED
PRESS HNDST LOC 4 SEC ON BASE
PLEASE WAIT...
HANDSET X
REGISTERED
Handsets purchased separately (AT&T TL90078) need to be registered to the telephone base before use. When first purchased, all expansion handsets show NOT REGISTERED on the screen. New handsets may need to be charged without interruption for at least 10 minutes before registering to the telephone base.
To register a handset to your telephone base
1.Make sure the handset is out of the telephone base or charger and shows NOT REGISTERED before you begin registration.
2.Press and hold 
HANDSET LOCATOR on the telephone base for about four seconds (until the red IN USE light on the telephone base is on) and then release the button. The IN USE light remains on while the telephone base attempts to register a handset.
3.Place the unregistered handset into the telephone base or charger, PRESS HNDST LOC 4 SEC ON BASE shows on the handset screen. The handset is now registering with the telephone base. The handset then shows PLEASE WAIT...
and it takes up to 60 seconds to complete the registration. There is a beep sound when the registration is successful. The handset shows HANDSET X REGISTERED, with X being the handset number
NOTES:
1.If the registration is not successful, the screen shows NOT REGISTERED. To reset the handset, remove the handset from the telephone base or charger, then start again from
step 2 above.
2.You cannot register a handset if any other system handset is in use.
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