freeswitch/conf/testing/dialplan/default/0002_leave_videomail.xml

<extension name="leave_videomail">
  <condition field="destination_number" expression="^6000$">
    <action application="answer"/>
    <action application="sleep" data="1000"/>
    <action application="voicemail" data="videomail ${domain_name} 1000"/>  
  </condition>
</extension>

<extension name="check_videomail">
  <condition field="destination_number" expression="^6001$">
    <action application="answer"/>
    <action application="sleep" data="1000"/>
    <action application="voicemail" data="check videomail ${domain_name} 1000"/>  
  </condition>
</extension>