freeswitch/conf/testing/dialplan/public/000001.xml

<!-- Image Playback Party -->
<extension name="image-play-back">
  <condition field="destination_number" expression="^playimg(\d+)$">
    <action application="set" data="test_role=playimg$1"/>
    <action application="answer"/>
    <action application="spandsp_start_dtmf"/>
    <action application="playback" data="{audio_file=silence_stream://-1,png_ms=-1}/${sip_h_X-File}"/>
  </condition>
</extension>

<!-- Conference MCU -->
<extension name="conf">
  <condition field="destination_number" expression="^6070$">
    <action application="set" data="test_role=${sip_h_X-Test-Role}"/>
    <!--
    <action application="set" data="video_mirror_input=true"/> 
    <action application="set" data="video_use_dedicated_encoder=true"/>
    -->
    <action application="push" data="conference_member_flags=moderator"/>
    <action application="conference" data="6070@video-mcu-stereo"/>  
  </condition>
</extension>