freeswitch/conf/insideout/dialplan/public/00_inbound_did.xml

<include>
  <extension name="public_did">
    <condition field="destination_number" expression="^(5551212)$">
      <!--
	  If you're hosting multiple domains you will want to set the
	  target_domain on these calls so they hit the proper domain after you
	  transfer the caller into the default context. 
	  
	  $${domain} is the default domain set from vars.xml but you can set it
	  to any domain you have setup in your user directory.

      --> 
      <action application="set" data="domain_name=$${domain}"/>
      <!-- This example maps the DID 5551212 to ring 1000 in the default context -->
      <action application="transfer" data="1000 XML default"/>
    </condition>
  </extension>
</include>