Deregister Handsets; Deregister All Handsets From The Telephone Base - AT&T DAL75121 Complete User's Manual

Appendix

Deregister handsets

You may need to deregister your handsets if:
You have five registered handsets and need to replace a handset.
f
-OR-
You wish to change the designated handset number of your registered
f
handsets.
You must first deregister ALL 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.

Deregister all handsets from the telephone base

In addition to the cordless handsets, this operation will also deregister all
cordless headsets registered to your telephone base.
1. Make sure that all handsets are out of the telephone base and chargers
before you begin deregistration.
2. Press and hold
when the IN USE light starts flashing, release
it again within two seconds.
turns off and all handsets display To register HS... and ... see user manual
alternately. Allow up to one minute for the process to complete.
3. To register the handset(s) to the telephone base again, follow the
registration instructions on pages 123-124.
Notes:
If the deregistration process fails, you may need to reset the system and try again. To reset, unplug the power from
f
the telephone base and plug it back in.
You cannot deregister the handsets if any other system handset is in use.
f
Even if the battery is depleted, you can still deregister the handsets by following the steps. After the handset is
f
charged for at least 10 minutes, the screen shows To register HS... and ... see manual alternately.
FIND HS on the telephone base. After about 20 seconds,
You hear a confirmation tone. The IN USE light
FIND HS and then press
125