[Freeswitch-users] dtmf mode = none

Hello FS Experts, I need to disable dtmf tones on an active call in FS. My case scenario is: regular call is setup by caller -> FS -> outgoing trunk and dtmf codes should be working fine. After some time a dtmf blocking event will be send by lua script or FS command line. This should block sending dtmf codes for caller and makes them "invisible" on outgoing trunk. Is this possible to do this with FS? I was thinking that maybe I can change dtmf_mode during active call to none, but this doesn't seem to be working. Any ideas? Best wishes, bugi