You can send a fax by dialing using the connected telephone when you want to talk over the phone before sending a fax, or when the recipient's fax machine does not switch to the fax automatically.
Pick up the handset of the connected telephone, and then dial the recipient's fax number using the phone.
When the recipient answers the phone, you can talk with the recipient.
Select Fax on the home screen.
Make necessary settings on the Fax Settings.
When you hear a fax tone, tap 
, and then hang up the handset.
When a number is dialed using the connected telephone, it takes longer to send a fax because the printer performs scanning and sending simultaneously. While sending the fax, you cannot use the other features.