You can find the menu on the printer's control panel below.
Settings > General Settings > Fax Settings > Basic Settings
On the Web Config screen, you can find the menu below.
Fax tab > Basic Settings
Fax Speed
ECM
Dial Tone Detection
Dial Mode
Line Type
Your Phone Number
Rings to Answer
Fax Speed
ECM
Dial Tone Detection
Dial Mode
Line Type
Your Phone Number
Rings to Answer
The functions for each item are the same as for standard faxing. See "Related Information" below for details on each item.