[Freeswitch-users] how to Ignore DTMF shorter than Fixed duration ?

Hi, We have a bugged provider that send us throw RTP wrong DTMF during call. It seems that wrong DTMF are shorter than 1200ms (about 90%) so I want to try to ignore them. For the moment, FS catch them and send it back to the bridged side, boring user. switch_rtp.c:3410 RTP RECV DTMF C:552 Does min-dtmf-duration will make FS ignore them and not RECV them ? I saw the DTMF in "normal" RTP packet, but no digit was pressed in user side. It's commented in my FS switch.conf.xml, how can I see the current value ? <!--<param name="min-dtmf-duration" value="400"/>--> Any other idea ? thanks