[Freeswitch-users] [VAD events][conference call]

Hi Users, I want to get the VAD events on a conference call, i want to join a conference call silently and just wanted to get vad events. What i did is to land the conference call in a context and run echo application.(as vad events appears on b leg) But that caused noise in conference, so i droped the rtp packets using iptables rules. Problem: Everything works great, but now i want to traverse in conference(like pin etc) and i send dtmf 2833 which also get droped by iptables. Question: is there a way i can get vad events and be as a silent listener of conference as well. P.S: previously i used originate conference and landed on park(), but that do not generate vad events. So i switched to echo() Regards Abbasi