diff --git a/conf/autoload_configs/switch.conf.xml b/conf/autoload_configs/switch.conf.xml
index 65ef667c10..c9570d07af 100644
--- a/conf/autoload_configs/switch.conf.xml
+++ b/conf/autoload_configs/switch.conf.xml
@@ -60,6 +60,7 @@
     <!--RTP port range -->
     <!--<param name="rtp-start-port" value="16384"/>-->
     <!--<param name="rtp-end-port" value="32768"/>-->
+    <param name="rtp-enable-zrtp" value="true"/>
   </settings>
 
 </configuration>