Canon Color imageCLASS MF8170c Software Manual page 169

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From the [File] menu, click [Printing Preferences].
You can also open the [MF8100 Series (FAX) Printing Preferences] dialog box by
right-clicking the corresponding printer driver icon and selecting [Printing
Preferences] from the pop-up menu.
The [Canon MF8100 Series (FAX) Printing Preferences] dialog box appears.
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Changing Fax Settings