[Freeswitch-dev] Lua session:execute did not return on conference

Had a try following the example found at http://wiki.freeswitch.org/wiki/Simple_conference.lua However, the session:execute seems wont return until the caller hangs up Following is my test script session:answer() session:setAutoHangup(false) session:sleep(200) session:execute("conference", "12345@default") freeswitch.consoleLog("notice", "testing conference\n") The freeswitch.consoleLog wont be execute unless the caller hangs up What's wrong with it? Regards Scott