diff --git a/app/calls/calls.php b/app/calls/calls.php
index 8644a98be1..9ba6322017 100644
--- a/app/calls/calls.php
+++ b/app/calls/calls.php
@@ -102,7 +102,7 @@ else {
 
 //rework select data query
 	$sql = str_replace('count(extension_uuid) as count', '*', $sql);
-	$sql .= ' order by extension';
+	$sql .= ' order by cast(extension as int)';
 	$sql .= " limit ".$rows_per_page." offset ".$offset." ";
 
 //execute select data query