Replace A Handset - AT&T TL90070 User Manual

Appendix

Replace a handset

If you want to replace a handset or re-assign the designated
handset number of a registered handset, you must deregister all
the handsets and then individually register each handset.
To make deregistration easier, read all of the instructions on this
page before you begin.
To deregister all handsets:
1. Press and hold
base for about 10 seconds until the IN USE light flashes, then
release /HANDSET LOCATOR.
/HANDSET LOCATOR again. You must press
2. Press
/HANDSET LOCATOR while the IN USE light is still flashing.
The IN USE light flashes for about seven seconds.
3. All system handsets show Out of range OR No power at base
for a few seconds and then show Press and hold HANDSET
LOCATOR on base for 4 sec, then press # on handset when
the deregistration is completed. The deregistration process
takes about 10 seconds to complete.
If deregistration fails, you may need to reset the telephone and
try again.
To reset:
• Press and hold
the telephone base.
-OR-
• Unplug the power from the telephone base, then plug it
back in.
After deregistering, register each handset individually. See
Add and register a handset on page 11.
NOTE: You cannot deregister the handsets if any other system handset is
in use.
/HANDSET LOCATOR on the telephone
OFF/CLEAR or place the handset back in
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