To register a handset to your telephone base, To register a handset to your, Telephone base – AT&T CL81219 User Manual
Page 45: Expansion handset, Adding and registering handsets (optional)

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Appendix C
Expansion handset
Adding and registering handsets (optional)
Handsets purchased separately (AT&T CL80109) 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 30 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 (1-12).
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.
NOT REGISTERED
PLEASE WAIT...
HANDSET X
REGISTERED
PRESS HNDST LOC
4 SEC ON BASE
NOT REGISTERED