Ricoh Aficio MP 1600L Operating Instructions Manual page 27

Note
❒ You can also adjust the On Hook volume when you press the {On Hook Di-
al} key. See "On Hook Dial", Facsimile Reference.
❒ If the extended security function prevents you from changing this setting,
contact the administrator.
❒ You can set the volume level to between 0 and 7.
Adjusting the Volume
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3