[Freeswitch-users] start_dtmf on BLeg Channel from the dialplan

Hi there, Is there a way to execute start_dtmf on the B Leg, from the dialplan, before you bridge call? I am using group_confirm, so that a called user is bridged when they answer and press 1. With one of my carriers, DTMF is not working - pressing 1 does nothing. If I use group_confirm=exec and send the B leg to a script on answer, and execute "start_dtmf" on the b leg session in the script, all works as expected and pressing 1 bridges the call. I would perfer not to use a script if there is a way of achieving this via the dialplan. Any help appreciated. Thanks Pj