Oki ES9160 MFP/ES9170 MFPES9460 MFP Scanning Manual page 105

6.INTERNET FAX
2
Press [2-SIDED SCAN].
The 2-SIDED SCAN screen appears.
3
Select either [BOOK] or [TABLET] for the original type, and then press [OK].
4
Press [ADDRESS] to return to the [ADDRESS] tab.
Continue the Internet faxing operation.
 P.95 "Sending Internet faxes"
6 INTERNET FAX
Sending Internet Faxes 103