GE 29115 Series - Manual (Page 40)

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NOTE: IF you are re-registering the handset
through the handset menu; to rename your
handset you must go to the Handset Name
Section and start from the beginning step.
De-Registration
De-registration cancels registration. During the
de-registration process, keep the handset near the base.
From the Handset Setup Menu:
1. Press the caller ID-volume ( 6 or 5) button to scroll to the
DEREGISTRATION sub-menu.
. Press the program/mute button to enter the menu.
DEREGISTRATION 1YES42NO - - - shows in the display
The default setting is "2NO".
. Use the touch-tone pad to select 1 for YES or  for NO. Or
use the caller ID-volume ( 6 or 5) button to scroll to 1YES
or 2NO.
WARNING: It is not recommended that a
handset be de-registered unless absolutely
necessary because once a handset is
de-registered, that handset’s telephone
features cannot be used until the handset is
re-registered.
. Select NO, if you do not want to de-register.