gistfile1.xml

<extension name="match_source_web">
  <condition field="${sip_h_X-CallTrackingApp-InboundSource}" expression="^Website$">
    <action application="answer"/>
    <action application="playback" data="tone_stream://%(251,0,1004);loops=1"/>
  </condition>
</extension>
<extension name="match_source_mag">
  <condition field="${sip_h_X-CallTrackingApp-InboundSource}" expression="^Publication$">
    <action application="answer"/>
    <action application="playback" data="tone_stream://path=${base_dir}/conf/tetris.ttml;loops=1"/>
  </condition>
</extension>