I am working through a conference module problem I am having. I have a simple dialplan implementation that answers an incoming call, plays a prompt, and then connects the call to a conference. Initially, I would dial in on two clients (one PSTN/SIP gateway and the other a SIP client on my laptop). The freeswitch console messages indicate the calls would connect to the conference but I heard no voice path. I have been working on it this morning and simplified my dialplan to the following. I have not modified the conference.conf.xml and I am using the default values. What I am experiencing now is a tremendous amount of echo. Any pointers on what the issue might be? Jonathan Here is my dialplan: <action application="answer"/> <action application="sleep" data="1000"/> <action application="playback" data="/usr/local/freeswitch/sounds/PlumbleIntro.wav"/> <action application="conference" data="airespring"/> Here is the freeswitch output: call number 1: 2007-12-10 11:40:38 [NOTICE] switch_core_state_machine.c:135 switch_core_standard_on_execute() Execute conference(airespring) 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'mute' bound to '0'. 2007-12-10 11:40:38 [DEBUG] switch_ivr.c:1095 switch_ivr_digit_stream_parser_set_event() max len 1 2007-12-10 11:40:38 [DEBUG] switch_ivr.c:1099 switch_ivr_digit_stream_parser_set_event() min len 1 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'deaf mute' bound to '*'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'energy up' bound to '9'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'energy equ' bound to '8'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'energy dn' bound to '7'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'vol talk up' bound to '3'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'vol talk zero' bound to '2'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'vol talk dn' bound to '1'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'vol listen up' bound to '6'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'vol listen zero' bound to '5'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'vol listen dn' bound to '4'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4439 conf_default_controls() Installing default caller control action 'hangup' bound to '#'. 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4175 conference_function() Raw Codec Activation Success L16@8000hz 1 channel 20ms 2007-12-10 11:40:38 [DEBUG] mod_conference.c:4214 conference_function() Raw Codec Activation Success L16@8000hz 1 channel 20ms 2007-12-10 11:40:38 [DEBUG] mod_sofia.c:810 sofia_receive_message() De-activate timed RTP! 2007-12-10 11:40:38 [DEBUG] switch_core_session.c:339 switch_core_session_receive_message() Kill sofia/default/17476338055@proxy01.sipphone.com:5060 [BREAK] 2007-12-10 11:40:38 [DEBUG] mod_conference.c:1531 conference_loop_output() setup timer soft success interval: 20 samples: 160 2007-12-10 11:40:38 [DEBUG] mod_conference.c:724 conference_thread_run() setup timer success interval: 20 samples: 160 2007-12-10 11:40:38 [DEBUG] switch_core_io.c:292 switch_core_session_read_frame() Engaging Read Buffer at 320 bytes call number 2: 2007-12-10 11:44:00 [NOTICE] switch_core_state_machine.c:135 switch_core_standard_on_execute() Execute conference(airespring) 2007-12-10 11:44:00 [DEBUG] mod_conference.c:4175 conference_function() Raw Codec Activation Success L16@8000hz 1 channel 20ms 2007-12-10 11:44:00 [DEBUG] mod_conference.c:4214 conference_function() Raw Codec Activation Success L16@8000hz 1 channel 20ms 2007-12-10 11:44:00 [DEBUG] mod_sofia.c:810 sofia_receive_message() De-activate timed RTP! 2007-12-10 11:44:00 [DEBUG] switch_core_session.c:339 switch_core_session_receive_message() Kill sofia/default/+16266880158@72.37.161.251:5060 [BREAK] 2007-12-10 11:44:00 [DEBUG] mod_conference.c:1531 conference_loop_output() setup timer soft success interval: 20 samples: 160 2007-12-10 11:44:00 [DEBUG] switch_core_io.c:292 switch_core_session_read_frame() Engaging Read Buffer at 320 bytes