diff --git a/res/res_pjsip/pjsip_config.xml b/res/res_pjsip/pjsip_config.xml
index a0049be36c..86a606b649 100644
--- a/res/res_pjsip/pjsip_config.xml
+++ b/res/res_pjsip/pjsip_config.xml
@@ -533,6 +533,9 @@
 							<enum name="inband">
 								<para>DTMF is sent as part of audio stream.</para>
 							</enum>
+							<enum name="none">
+								<para>DTMF is not sent or received.</para>
+							</enum>
 							<enum name="info">
 								<para>DTMF is sent as SIP INFO packets.</para>
 							</enum>