AT&T TL30100 User Manual page 16

Adding the handset to your telephone base
Deregistering all handsets
To register the handset(s) to the telephone base again, follow
the registration instructions in Registering a handset on page 9.
NOTES:
• 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.
• You cannot deregister the handset(s) if any system handset is in use.
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