diff --git a/lib/NGCP/Panel/Controller/API/CFMappings.pm b/lib/NGCP/Panel/Controller/API/CFMappings.pm
index 93b788fc02..70235421d9 100644
--- a/lib/NGCP/Panel/Controller/API/CFMappings.pm
+++ b/lib/NGCP/Panel/Controller/API/CFMappings.pm
@@ -35,7 +35,7 @@ sub documentation_sample {
         }],
         cfna => [],
         cft => [],
-        cft_ringtimeout => "200",
+        cft_ringtimeout => 200,
         cfu => [],
         cfs => [],
         cfr => [],
diff --git a/lib/NGCP/Panel/Role/API/CFMappings.pm b/lib/NGCP/Panel/Role/API/CFMappings.pm
index 23fede3a3d..67cc554ce5 100644
--- a/lib/NGCP/Panel/Role/API/CFMappings.pm
+++ b/lib/NGCP/Panel/Role/API/CFMappings.pm
@@ -112,7 +112,7 @@ sub hal_from_item {
         resource => $resource,
         run => 0,
     );
-    $resource->{cft_ringtimeout} = $ringtimeout_preference;
+    $resource->{cft_ringtimeout} = (length($ringtimeout_preference) ? $ringtimeout_preference + 0 : undef);
     $resource->{id} = int($item->id);
 
     $self->expand_fields($c, $resource);