How do I disable the CTCSS/DCS tone on the Durafon-UHF? EnGenius Admin Updated January 31, 2017 20:22 Follow Press Mode button three times. Use the up and down button to change the code. (Set “code” to “0”) Related articles I would like to replace a DuraFon PRO handset, but there is no “clear HS” option. Can you program each line on UHF/PRO/SIP handset to a specific extension? What type of headset will work with the DuraFon-UHF handset? What frequency channels are set for the DuraFon UHF to by default? Can I change the frequency of my DurafonPRO system? Comments 0 comments Please sign in to leave a comment.