Oki ES8453 MFP User Manual - page 539
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Setting So That You Can Hear Line Monitor Sound
To hear the monitor sound during fax transmission and reception, set as described below.
1.
Press [Device Settings] on the touch panel.
2.
Press or several times and press [Admin Setup].
3.
Enter the administrator name and password and press [OK].
The factory default administrator name and password are "admin" and "aaaaaa"
respectively.
4.
Press or several times and press [User Install].
5.
Press or several times and press [Monitor Control].
6.
Select a monitor control.
7.
Press [Back] until the home screen is displayed.
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