diff --git a/autoload_configs/switch.conf.xml b/autoload_configs/switch.conf.xml
index f60157f..595aa37 100644
--- a/autoload_configs/switch.conf.xml
+++ b/autoload_configs/switch.conf.xml
@@ -41,7 +41,7 @@
         <!--<param name="timer-affinity" value="disabled"/>-->
         <param name="rtp-start-port" value="16384"/>
         <param name="rtp-end-port" value="32768"/>
-        <param name="rtp-enable-zrtp" value="false"/>
+        <param name="rtp-enable-zrtp" value="true"/>
         <!--<param name="core-db-dsn" value="fs_core"/>-->
         <!--<param name="core-dbtype" value="MSSQL"/>-->
     </settings>
diff --git a/sip_profiles/internal.xml b/sip_profiles/internal.xml
index 340451b..bc911f8 100644
--- a/sip_profiles/internal.xml
+++ b/sip_profiles/internal.xml
@@ -106,7 +106,7 @@
 
 
             <!-- DTMF -->
-            <param name="dtmf-duration" value="350"/>
+            <param name="dtmf-duration" value="500"/>
             <param name="rfc2833-pt" value="101"/>
             <param name="dtmf-type" value="rfc2833"/>
             <param name="pass-rfc2833" value="false"/>