Lexmark MX310
Open a Web browser, and then type the printer IP address in the address field.
Notes:
Click Settings > Fax Settings > Analog Fax Setup.
From the Fax Settings menu, type the name to be printed on all outgoing faxes in the Fax Name or Station Name field.
In the Fax Number or Station Number field, enter the printer fax number.
Click Submit.
General Fax Setup Troubleshooting for Most Lexmark MFPs (2011)
Here are troubleshooting steps when unable to 'Send' a fax with Laser Multifunction Printers (MFPs).