diff --git a/utils/rtpengine-ng-client b/utils/rtpengine-ng-client
index 9091e42fcb..54a1a45dc6 100755
--- a/utils/rtpengine-ng-client
+++ b/utils/rtpengine-ng-client
@@ -100,6 +100,7 @@ my @int_opts = qw(
 	DTMF-delay
 	ptime
 	db-id
+	duration
 );
 
 my @string_arr_opts = qw(