How to Change DTMF settings on a Durafon 1x V2 system. EnGenius Updated March 16, 2017 21:43 Follow Press MENU *##* then choose option "8" and select base “10”. You can then change the DTMF duration. Related articles How to use PBX options that have been enabled on the handset? I would like to replace a DuraFon PRO handset, but there is no “clear HS” option. How to Extend Phone Coverage Outdoors What should I do when my Visual Message Waiting Indication on PRO is not working? A pair of ENH202 in WDS Bridge mode is not passing traffic. Comments 0 comments Please sign in to leave a comment.