freeswitchforum.com

        <extension name="my_input_ext">
                <action application="bridge" data="${group_call(default@my_domain)}"/>
        </extension>

<user id="101">
        <!--  <variable name="callgroup" value="default"/> -->

      <group name="default">
        <users>
          <X-PRE-PROCESS cmd="include" data="my_domain/*.xml"/>
        </users>
      </group>

    <groups>
     <group name="default">
        <users>
          <X-PRE-PROCESS cmd="include" data="my_domain/*.xml"/>
        </users>
      </group>
    </groups>

   <X-PRE-PROCESS cmd="include" data="my_domain_other/*.xml"/>