diff --git a/lib/utils/plivoxml.js b/lib/utils/plivoxml.js
index 8da06fd..fd5a887 100644
--- a/lib/utils/plivoxml.js
+++ b/lib/utils/plivoxml.js
@@ -749,7 +749,7 @@ function Dial(Response) {
   this.valid_attributes = ['action', 'method', 'timeout', 'hangupOnStar',
     'timeLimit', 'callerId', 'callerName', 'confirmSound',
     'dialMusic', 'confirmKey', 'redirect', 'callbackUrl',
-    'callbackMethod', 'digitsMatch', 'digitsMatchBLeg', 'sipHeaders'];
+    'callbackMethod', 'digitsMatch', 'digitsMatchBLeg', 'sipHeaders', 'confirmTimeout'];
   this.nestables = ['Number', 'User'];
 }
 util.inherits(Dial, Response);