Konica Minolta bizhub 421 - Manual (Page 240)

501/421/361 9-23
Administrator mode settings 9
Line Monitor Sound Vol.
Specify the speaker volume between zero and 31 (Default: 16).
9.4.10 Fax Settings - TX/RX Settings
Specify file handling for polling TX operations and printing method for RX operations.
Duplex Print (RX)
Specify "ON" to have received documents to be printed on both sides of paper.
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Detail
It does not appear if "Print Separate Fax Pages" is set to "ON".
Letter/Ledger over A4/A3
Specify "ON" to select an inch-type paper over others for printing received documents.