Select the device that has the fax module & fax line connected by checking the checkbox next to the correct one (you can always confirm you select the correct one by its IP address),

Hit next once you have selected them. The next screen will display the installation summary with the devices to be installed and drivers that will be installed for those devices. Click Install to continue. The installation will add the drivers, one of them in my case is the Fax driver that will add any printout to the outgoing fax queue. On the next screen, the installation completed summary will display giving you the chance of renaming the printers if you would like to use a meaningful name, define a default system printer and testing the printing capabilities. Click Finish to exit the installation wizard.