Nik,

Right now there is mod_vmd.  It sets the channel variable vmd_detect if it detects a beep.  If a beep is detected it will set vmd_detect=TRUE.  If no beep is detected then it won't do anything.

Example of usage as follows (with the outcome being hangup if answering machine is detected):

<extension name="110">

  <condition field="destination_number" expression="^110$">

    <action application="answer"/>

    <action application="vmd"/>

    <action application="playback" data="$SOMEFILE"/>

    <action application="transfer" data="111 xml $context/>

  </condition>

</extension>

<extension name="111">

  <condition field="destination_number" expression="^111$"/>

  <condition field="${vmd_detect}" expression="^TRUE">

    <action application="hangup"/>

    <anti-action application="transfer" data="112 xml $context"/>

  </condition>

</extension>

And Ken Rice also has a mod that can be licensed that probably is a better solution and works much better.  

Hope this helps.

SDR