diff --git a/app/extensions/resources/classes/extension.php b/app/extensions/resources/classes/extension.php
index b03fe61ea1..962fa75e6a 100644
--- a/app/extensions/resources/classes/extension.php
+++ b/app/extensions/resources/classes/extension.php
@@ -293,6 +293,7 @@
 							$xml .= "      <param name=\"dial-string\" value=\"" . $dial_string . "\"/>\n";
 							$xml .= "    </params>\n";
 							$xml .= "    <variables>\n";
+							$xml .= "      <variable name=\"domain_name\" value=\"" . $_SESSION['domain_name'] . "\"/>\n";
 							$xml .= "      <variable name=\"domain_uuid\" value=\"" . $_SESSION['domain_uuid'] . "\"/>\n";
 							$xml .= "      <variable name=\"extension_uuid\" value=\"" . $extension_uuid . "\"/>\n";
 							if (strlen($row['call_group']) > 0) {