thanks trixter

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6469 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/dialplan/default.xml

 <context name="default">
   <extension name="global" continue="true">
-    <condition>
-      <action application="set" data="use_profile=${cond(${is_lan_addr(${network_addr})} == yes ? nat : default)}"/>
+    <condition field="${network_addr}" condition="^$">
+      <action application="set" data="use_profile=${cond(${is_lan_addr($${local_ip_v4})} == yes ? nat : default)}"/>
+      <anti-action application="set" data="use_profile=${cond(${is_lan_addr(${network_addr})} == yes ? nat : default)}"/>
     </condition>
     <!-- This will setup some variables if the user isn't authenticated.
          numbering_plan is required for the demo to function properly.