How do I configure an analog phone line for faxing?
Remove the cover from the fax ports and connect the provided phone cord to both the printer's fax port and a wall jack. Reinstall the cover, then proceed with configuration in Fax Set-Up Utility (Page 10).
From the official HP Color Laserjet Pro Mfp 4301 4303dw Fdn Fdw Printer manual, page 10
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