AT&T TL90078 - Manual (Page 14)

10
Getting started
Replacing a handset
You may need to de-register your handsets if:
You have twelve registered handsets and need to replace a unit.
-OR-
You wish to change the designated handset number of your
registered handsets.
You must first de-register ALL the handsets, and then re-register
each handset you wish to use.
Please read carefully through all the instructions on this page
before beginning the de-registration process.
To de-register all handsets
1. Press and hold
HANDSET LOCATOR on the telephone base
for about 10 seconds (until the IN USE light turns on and
starts to flash), then release the HANDSET LOCATOR button.
2. Immediately press and release HANDSET LOCATOR again.
You must 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. The handset(s) will show SEARCHING FOR BASE and it will
take about 10 seconds to complete the de-registration process.
ALL handsets will show
NOT REGISTERED if de-registration
was successful.
4. To re-register the handset(s) to the telephone base, follow the
registration instructions on page 9.
NOTES:
1. If the de-registration process was not successful, you may need to reset the
system and try again. To reset: pick up the handset and press the HOME/
FLASH
button, then press the OFF/
CLEAR
button and place the handset back into the
telephone base. You may also reset by unplugging the power from the telephone
base and plugging it back in.
2. You cannot de-register the handset(s) if any other system handset is in use.