AT&T EL52100 - Telephone Base Settings; Base Ringer Volume Adjustment

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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 (1-5),
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 the handset is on an outside call, the telephone base
volume cannot be changed.
Telephone base ringer volume