Konica Minolta bizhub 421 - Manual (Page 258)

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Administrator mode settings 9
Function Settings - PC-FAX TX Setting
Specify the line to use for PC-FAX transmission.
Multi Line Setting
Select a communications method for extension lines from "TX and RX", "RX Only", and "TX Only".
Sender Fax No.
Register the sender fax number for the extension line. The registered fax number is printed as the sender
information on the document received by the recipient. Enter the fax number within 20 characters, using the
keypad, characters * and, #, and the [+] and [Space] keys.