diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea66c7ca..355578df 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # bitrix24-php-sdk change log
 
-## 2.0-beta.1 — 10.11.2022
+## 2.0-beta.1 — 25.02.2023
 
 ### Added
 
@@ -30,7 +30,8 @@
 * fix [typehint at ContactItemResult](https://github.com/mesilov/bitrix24-php-sdk/issues/320)
 * fix [return types in DealCategoryItemResult](https://github.com/mesilov/bitrix24-php-sdk/issues/322)
 * fix [add auth node in telephony voximplant events requests](https://github.com/mesilov/bitrix24-php-sdk/issues/331)
-
+* fix [add helper metods isError for registerCallResult fortelephony](https://github.com/mesilov/bitrix24-php-sdk/issues/335)
+* 
 ### etc
 
 ## 2.0-alpha.7 — 8.08.2022
diff --git a/src/Services/Telephony/Result/ExternalCallRegisterItemResult.php b/src/Services/Telephony/Result/ExternalCallRegisterItemResult.php
index ba8a09c2..ef2759a1 100644
--- a/src/Services/Telephony/Result/ExternalCallRegisterItemResult.php
+++ b/src/Services/Telephony/Result/ExternalCallRegisterItemResult.php
@@ -16,14 +16,22 @@
 use Bitrix24\SDK\Core\Result\AbstractItem;
 
 /**
+ * If registration of the call was unsuccessful, the LEAD_CREATION_ERROR field will contain the error message.
+ *
  * @property-read  string $CALL_ID
- * @property-read  int $CRM_CREATED_LEAD
- * @property-read  int $CRM_ENTITY_ID
+ * @property-read  ?int $CRM_CREATED_LEAD
+ * @property-read  ?int $CRM_ENTITY_ID
  * @property-read  string $CRM_ENTITY_TYPE
  * @property-read  array $CRM_CREATED_ENTITIES
  * @property-read  string $LEAD_CREATION_ERROR
  */
 class ExternalCallRegisterItemResult extends AbstractItem
 {
-
+    /**
+     * @return bool
+     */
+    public function isError(): bool
+    {
+        return $this->data['LEAD_CREATION_ERROR'] !== '' && $this->data['LEAD_CREATION_ERROR'] !== null;
+    }
 }
\ No newline at end of file