[Freeswitch-users] Stopping TTS when play_and_detect_speech gets MRCP START-OF-INPUT

Hi, I'm trying play_and_detect_speech with an ESL app but START-OF-INPUT doesn't interrupt the TTS being played. Is this expected? ( https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools%3A+play_and... is not clear about it) Or maybe I need to set some channel variable for this to work.