add liberal-dtmf

freeswitch/sip_profiles/sipinterface_1.xml

@@ -109,7 +109,8 @@
             <param name="dtmf-duration" value="960"/>
             <param name="rfc2833-pt" value="101"/>
             <param name="dtmf-type" value="rfc2833"/>
-            <param name="pass-rfc2833" value="false"/>
+			<param name="pass-rfc2833" value="false"/>
+			<param name="liberal-dtmf" value="true"/>
 
 
             <!-- Codecs -->