AT&T CL84109 - Manual (Page 74)

68
Appendix C
Expansion handset
Deregistering a handset
You may need to deregister your handsets if:
You have twelve 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 re-register each handset
you wish to use, 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
INTERCOM
/HANDSET LOCATOR on the telephone base for
about 10 seconds (until the IN USE light starts to flash), then release the
INTERCOM
/HANDSET LOCATOR button.
2. Immediately press and release
INTERCOM
/HANDSET LOCATOR again. You
must press
INTERCOM
/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 charger, then start
again with step one above.)
3. The handsets show CONNECTING... and it takes about 10 seconds to
complete the deregistration process. ALL handsets show NOT REGISTERED
when deregistration is successful.
4. To re-register handsets to the telephone base, follow the registration
instructions on page 67.
NOTES:
1. If the deregistration process is not successful, you might need to reset the system and try
again. To reset: pick up the handset and press the PHONE/FLASH button, then press the
OFF/CLEAR button and place the handset back into the charger. You can also reset by
unplugging the power from the telephone base and plugging 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 NOT REGISTERED.