[Freeswitch-users] setting VAD & TALK / NOTALK Events on ongoing call

Hi, is it possible to enable VAD to get TALK / NOTALK events for an ongoing call, i.e. switch_channel_set_variable(channel, "rtp_enable_vad_in", "true"); switch_channel_set_variable(channel, "rtp_enable_vad_out", "true"); switch_channel_set_variable(channel, "fire_talk_events", "true"); switch_channel_set_variable(channel, "fire_not_talk_events", "true"); Should this work ? Is there another way instead of settings channel vars ? Thanks in advance. gw