Lexmark MX331
A fax server mode in fax settings is not available or missing.
Going through EWS > Settings > Fax setting > Fax mode > no fax server option.
Check the firmware and make sure that it is updated to FW74 or higher. The fax server is supported in 2.8” panel size devices since FW7.4.
After upgrading the firmware, import the EnableFaxServer.zip configuration file and restart the device.
LEGACY ID: SO9036
Configure the printer for you to send and receive fax messages using the fax server.
Use the Embedded Web Server or the setup wizard to configure your printer to send and receive analog fax messages.