diff --git a/lib/rest/utils.js b/lib/rest/utils.js
index 98bcabf..1ece32a 100644
--- a/lib/rest/utils.js
+++ b/lib/rest/utils.js
@@ -32,6 +32,10 @@ export function camelCaseRequestWrapper(requestFunc) {
         'message_time__gt', 'message_time__gte',
         'end_time__gt', 'end_time__gte',
         'end_time__lt', 'end_time__lte',
+        'bill_duration__gt', 'bill_duration__gte',
+        'bill_duration__lt', 'bill_duration__lte',
+        'add_time__gt', 'add_time__gte',
+        'add_time__lt', 'add_time__lte',
       ]
       if (skipParamsFromSnakeCasing.indexOf(key) >= 0) {
         return key;