hello sometimes , conference play command dose not return immediately. Example 1.make default conference 2.enter command in fs_cli many times conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav 3. sometimes not return 4.if input dtmf return prompt why conference play command does not return immediately? freeswitch@internal> version FreeSWITCH Version 1.4.13+git~20141024T064225Z~e8a01c97f9~64bit (git e8a01c9 2014-10-24 06:42:25Z 64bit) uname -a Linux ITS-SIP-07 2.6.32-504.el6.x86_64 #1 SMP Wed Oct 15 04:27:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux CentOS release 6.6 (Final) Kernel \r on an \m console log freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav _yes_no.wav ::::::::: not response conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav 2014-12-19 05:57:45.588937 [DEBUG] switch_rtp.c:6041 RTP RECV DTMF 1:2080 2014-12-19 05:57:45.588937 [DEBUG] switch_channel.c:488 RECV DTMF 1:2080 (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav 2014-12-19 05:57:45.608938 [DEBUG] mod_conference.c:5659 Queueing file '/usr/local/freeswitch/sounds/en/us/callie/currency/negative.wav' for play 2014-12-19 05:57:45.608938 [DEBUG] mod_conference.c:5659 Queueing file '/usr/local/freeswitch/sounds/en/us/callie/digits/1.wav' for play freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav freeswitch@internal> conference aaaaaa play /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav (play) Playing file /usr/local/freeswitch/sounds/en/us/callie/voicemail/8000/vm-tutorial_yes_no.wav