add options ping to gateway

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8223 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/directory/default/brian.xml

@@ -35,6 +35,8 @@
       <!--<param name="caller-id-in-from" value="false"/>-->
       <!--extra sip params to send in the contact-->
       <!--<param name="contact-params" value="tport=tcp"/>-->
+      <!--send an options ping every x seconds, failure will unregister and/or mark it down-->
+      <!--<param name="ping" value="25"/>-->
       <!--</gateway>-->
     </gateways>
     <params>