AT&T CL82350 - Manual (Page 55)

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Deregistering a handset
You may need to deregister your handsets if:
You have 12 registered handsets and need to replace a handset.
-OR-
You wish to change the designated handset number of your registered
handsets.
You must first deregister ALL the handsets, and then register each handset
you wish to use again, one at a time.
Please read carefully through all the instructions on this page before
beginning the deregistration process.
To deregister all handsets
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
/ HANDSET LOCATOR button.
2. Immediately press / HANDSET LOCATOR while the IN USE light is still
flashing. (The light flashes for about seven seconds. If the light stops
flashing, pick up the handset and place it back into the telephone base,
then start again with step one above.)
3. It takes up to 60 seconds to complete the deregistration process. Wait
for the cordless handset screen to alternately display 1.Press HS LOC
on base 4sec and 2.Then press # on handset before registering the
handset(s) again.
4. To register the handset(s) to the telephone base again, follow the
registration instructions on the previous page.
After you deregister the handset(s), the telephone base is in idle mode but
the system date and time information needs to be reset. For instructions,
see
Set date/time on page 12.
NOTES:
1. If the deregistration process is not successful, you might need to reset the system and try
again. To reset, unplug the power from the telephone base and plug it back in.
2. You cannot deregister the handset(s) if any other system handset is in use.
3. Even if the battery is depleted, you can still deregister the handset by following the steps
above. After the handset is charged for at least 10 minutes, the screen shows 1.Press HS
LOC on base 4sec and 2.Then press # on handset.
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Appendix