interesting

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6192 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/default_context.xml

 <context name="default">
+  <extension name="global">
+    <condition>
+      <action application="set" data="use_profile=${qq(${is_lan_addr(${network_addr})} == yes ? nat : default)}"/>
+    </condition>
+  </extension>
   <!-- 
   if the calling party is the called party, go to their VM
   if the calling party is NOT the called party dial the extension