bugfix: duration and sip_status display as numbers

lib/utils/snake-case.js

@@ -9,11 +9,12 @@ function snakeCase(obj) {
   }
   else if (typeof obj === 'object' && obj !== null) {
     Object.keys(obj).forEach((key) => {
-      obj[snake(key)] = obj[key];
+      const value = obj[key];
       delete obj[key];
+      obj[snake(key)] = value;
     });
   }
-  else if (typeof obj === 'string') {
+  else if (['string', 'number', 'boolean'].includes(typeof obj)) {
     obj = snake(obj);
   }
   return obj;