bigbluebutton-Github/bbb-voice-conference/config/freeswitch/conf/dialplan/public.xml

<!--
    NOTICE:

    This context is usually accessed via the external sip profile listening on port 5080.
    
    It is recommended to have separate inbound and outbound contexts.  Not only for security
    but clearing up why you would need to do such a thing.  You don't want outside un-authenticated
    callers hitting your default context which allows dialing calls thru your providers and results 
    in Toll Fraud.
-->

<!-- http://wiki.freeswitch.org/wiki/Dialplan_XML -->
<include>
  <context name="public">

    <extension name="unloop">
      <condition field="${unroll_loops}" expression="^true$"/>
      <condition field="${sip_looped_call}" expression="^true$">
	<action application="deflect" data="${destination_number}"/>
      </condition>
    </extension>
    <!--
	Tag anything pass thru here as an outside_call so you can make sure not
	to create any routing loops based on the conditions that it came from 
	the outside of the switch.  
    -->
    <extension name="outside_call" continue="true">
      <condition>
	<action application="set" data="outside_call=true"/>
	<action application="export" data="RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)}"/>
      </condition>
    </extension>

    <!--
        You can place files in the public directory to get included.
    -->
    <X-PRE-PROCESS cmd="include" data="public/*.xml"/>


  </context>

</include>