freeswitch/conf/vanilla/lang/en/en.xml

<include>
  <language name="en" say-module="en" sound-prefix="$${sounds_dir}/en/us/callie" tts-engine="cepstral" tts-voice="callie">
    <phrases>
      <macros>
        <X-PRE-PROCESS cmd="include" data="demo/*.xml"/> <!-- Note: this now grabs whole subdir, previously grabbed only demo.xml -->
        <!-- voicemail_en_tts is purely implemented with tts, we have the files based one that is the default. -->
        <X-PRE-PROCESS cmd="include" data="vm/sounds.xml"/> <!-- vm/tts.xml if you want to use tts and have cepstral -->
        <X-PRE-PROCESS cmd="include" data="dir/sounds.xml"/> <!-- dir/tts.xml if you want to use tts and have cepstral -->
        <X-PRE-PROCESS cmd="include" data="ivr/*.xml"/>  <!-- IVR and custom phrases go here -->
      </macros>
      <X-PRE-PROCESS cmd="include" data="vm/voicemail_ivr.xml"/>
    </phrases>
  </language>
</include>
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