How do I set or change the fax header on the M428/M429?
From the printer control panel, touch Fax, then touch Setup, then Preferences, and then touch Fax Header. Enter your personal or company name and touch Done, then enter your fax number and touch Done. The maximum number of characters for the fax header is 25, and the maximum for the fax number is 20. (Page 5)
From the official HP Laserjet Pro Mfp M428 M429 manual, page 5
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