Volume Control HIGH or LOW Set the fax (handset or extension phone) to ring (in FaxTel or FaxOnly mode) ON or OFF Set the volume of the line (Hook) monitor (sound during dialing). 0 (off), 1, 2 or 3 Set the volume of the error alarm sound. 0 (off), 1, 2 or 3 Set the volume of the keypad.
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