sigh.. some phones don't add it to the req params

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9722 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/dialplan/features.xml

@@ -39,7 +39,7 @@
 
     <extension name="is_secure">
       <!-- Only Truly consider it secure if its TLS and SRTP --> 
-      <condition field="${sip_req_params}" expression="transport=tls"/>
+      <condition field="${sip_contact_params}" expression="transport=tls"/>
       <condition field="${sip_secure_media_confirmed}" expression="^true$">
 	<action application="sleep" data="1000"/>
 	<!--<action application="send_display" data="Secure Music On Hold "/>-->