AT&T TL32100 - Telephone Base Ringer Volume

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Telephone settings
When the telephone is not in use, press VOLUME
on the telephone base to set the ringer volume level
(1-6), or turn the ringer off. A sample of the ringer
sounds as you adjust the volume. The telephone base
announces, “Base ringer is off” when you set the
volume to 0.
NOTE: If a handset is on an outside call or accessing the answering system, the telephone
base volume cannot be changed.
Telephone base ringer volume