diff --git a/sip_profiles/sipinterface_1.xml b/sip_profiles/sipinterface_1.xml
index 614690e..ee473c6 100644
--- a/sip_profiles/sipinterface_1.xml
+++ b/sip_profiles/sipinterface_1.xml
@@ -112,7 +112,7 @@
             <!--<param name="bitpacking" value="aal2"/> -->
             <param name="disable-transcoding" value="false"/>
             <!--<param name="NDLB-allow-bad-iananame" value="true"/>-->
-            <!--<param name="t38-passthru" value="true"/>-->
+            <param name="t38-passthru" value="true"/>
 
 
             <!-- NAT -->