Oki MB780 User Manual page 62

To connect a telephone, an answering machine, or other telecommunications equipment to the printer:
1
Remove the plug from the back of the printer.
2
Connect your telecommunications equipment directly to the EXT port
Note: Once this plug is removed, any country- or region-specific equipment that you connect to the printer by way
of the adapter, as shown, will not function properly.
Country/region
•
Germany
•
Austria
•
Switzerland
Additional printer setup
62
on the back of the printer.