<include>
  <language name="en" sound-path="$${base_dir}/sounds/en/us/callie" tts-engine="cepstral" tts-voice="callie">
    <X-PRE-PROCESS cmd="include" data="demo/demo.xml"/>
    <!--voicemail_en_tts is purely implemented with tts, we need a files based implementation too -->
    <X-PRE-PROCESS cmd="include" data="vm/sounds.xml"/>
  </language>
</include>