update the config to reflect you need to set this per conference.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9842 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/autoload_configs/conference.conf.xml

@@ -122,6 +122,8 @@
       <param name="caller-id-name" value="$${outbound_caller_name}"/>
       <param name="caller-id-number" value="$${outbound_caller_id}"/>
       <param name="comfort-noise" value="true"/>
+      <!--<param name="tts-engine" value="flite"/>-->
+      <!--<param name="tts-voice" value="kal16"/>-->
     </profile>
 
     <profile name="ultrawideband">
@@ -145,6 +147,8 @@
       <param name="caller-id-name" value="$${outbound_caller_name}"/>
       <param name="caller-id-number" value="$${outbound_caller_id}"/>
       <param name="comfort-noise" value="true"/>
+      <!--<param name="tts-engine" value="flite"/>-->
+      <!--<param name="tts-voice" value="kal16"/>-->
     </profile>
   </profiles>
 </configuration>