Selecting On disables manual entry of the recipient's fax numbers allowing the operator to select recipients only from the contacts list or sent history.
Selecting Enter Twice requires the operator to enter the fax number again when the number was manually entered.
Selecting Off enables manual entry of the recipient's fax numbers.
Selecting On displays a recipient confirmation screen before starting the transmission.
Backup copies of sent and received documents are usually temporarily stored in the printer's memory to prepare for an unexpected power failure due to an electricity failure or incorrect operations.
Selecting On automatically erases the backups when sending or receiving a document completes successfully and the backups become unnecessary.