I fixed it by putting <param name="member-flags" value="dist-dtmf" /> into SLA profile in conference.conf.xml (I had it on in the default) … From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Bob McCarthy Sent: Thursday, March 01, 2012 1:25 AM To: freeswitch-users@lists.freeswitch.org Subject: [Freeswitch-users] send_dtmf fails on sla barge in dialplan default.xml has <action application="set" data="dtmf_type=info"/> prior to the bridge internal.xml has no dtmf statements uncommented when sending dtmf from the Polycom dialpad after a barge in using SLA, (also after the barging phone hangs up) I get the following error: 2012-03-01 03:05:53.841090 [ERR] switch_ivr_async.c:547 dmachine overflow error! FreeSWITCH Version 1.0.head (git-23645b6 2012-02-27 16-49-12 -0600) Bob McCarthy