Select whether to use the F-Code TX function.
F-Code TX is a function that sends documents to a destination by entering a SUB address and a sender ID (communication password) of a specific user box. The remote machine must support the F-Code TX/RX. Faxing is possible without specifying a sender ID (communication password). This setting is used for Confidential Communication, Relay Distribution, or PC-Fax RX.
[ON] is selected by default.