Refer to the printer's User's Guide on how to connect your Lexmark X5470 to your telephone line for faxing. If the printer software is already installed on your computer, you can access the printer's User's Guide by going to the Start
menu -> Programs
-> Lexmark 5400 Series
-> User's Guide
(applicable to Windows OS). If not, you can download it from the Lexmark website for free using this link: Lexmark 5400 Series All-In-One User's Guide
. Scroll to page 12 for the fax setup instructions. Also, check page 71for faxing instructions (sending, receiving, etc.). Hope this helps.
If you need additional assistance, please contact Lexmark technical support. Thanks.