Where should I write this line

<extension name="international dialing">
 <condition field="${toll_allow}" expression="international">
   <anti-action application="playfile"
data="misc/you-are-not-authorized.wav"/>
   <anti-action application="hangup"/>
 </condition>
 <condition field="destination_number" expression="^(\d+)$"> <!-- use
whatever value works for you -->

   <action application="bridge" data="sofia/internal/$1@whatever"/>
 </condition>

on the default.xml or in the default category?