Dell 3115cn Color Laser Printer - Manual (Page 336)

Open the file you want to send by fax. 1.
Open the print dialog box from the application, and then select Dell MFP Laser 3115cn Fax . 2.
Click Preferences . 3.
The Printing Preferences dialog box opens. You can use the FAX Settings to set the following settings. 4.
NOTE: The settings done here are only applied to a single fax job.