diff --git a/packages/core/src/Core/Model/Response/CdrResponse.php b/packages/core/src/Core/Model/Response/CdrResponse.php
index <HASH>..<HASH> 100644
--- a/packages/core/src/Core/Model/Response/CdrResponse.php
+++ b/packages/core/src/Core/Model/Response/CdrResponse.php
@@ -34,6 +34,16 @@ class CdrResponse
     protected $notes;
 
     /**
+     * @return bool
+     */
+    public function isAccepted()
+    {
+        $code = intval($this->getCode());
+
+        return $code === 0 && $code >= 4000;
+    }
+
+    /**
      * @return string
      */
     public function getId()
add is accepted, close giansalex/greenter#<I>