Solved.

Ok. I have recieved good advise in IRC, thanks. I am able to not break playing of session:streamFile by returning 'true' from OnInput function.
Thus there is not matter that Mod_pocketsphinx generate "bad" events when I don't say anything, the  session:streamFile continue the playing of file.
I still don't know 100% what settings in pocketsphinx.conf.xml means but it works fine with default.

From: nasida@live.ru
To: freeswitch-users@lists.freeswitch.org
Date: Fri, 6 Jul 2012 21:18:58 +0400
Subject: [Freeswitch-users] sensibility of voice level for Mod_pocketsphinx

Hi guys,

Whether somebody know how to lower sensibility of voice level for Mod_pocketsphinx. I play with "threshold" in pocketsphinx.conf.xml but I have not any effect.
the Mod_pocketsphinx begins to generate event == "begin-speaking" when I don't say anything...

Also i would like do NOT break the  current playing of session:streamFile when events of Mod_pocketsphinx is being generated. Is it possible ?

Also can somebody explain that this parameters means ? 
I understand approximately but I would like to know for certain. I have found nothing in wiki.

    <param name="threshold" value="400"/>
    <param name="silence-hits" value="25"/>
    <param name="listen-hits" value="1"/>
    <param name="auto-reload" value="true"/>
    <!--<param name="language-weight" value="1"/>-->
    <!--<param name="narrowband-model" value="communicator"/>-->
    <!--<param name="wideband-model" value="wsj1"/>-->

Thanks.

_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com Join Us At ClueCon - Aug 7-9, 2012 FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org