When registering a recipient to the contacts list, you can select IP-FAX as the line setting.
Select the menus on the printer's control panel as described below.
Settings > Contacts Manager
Select Add/Edit/Delete.
Do one of the following.
Select Fax from the type options displayed.
You cannot change the type after registration is complete. If you want to change the type, delete the destination and then register again.
Select Fax Number (Required).
Select IP-FAX in Select Line.
Enter a destination.
Select OK to apply the settings.