diff --git a/app/devices/device_edit.php b/app/devices/device_edit.php
index 8bfa777b47..bf68462055 100644
--- a/app/devices/device_edit.php
+++ b/app/devices/device_edit.php
@@ -1239,7 +1239,7 @@
 					if (empty($row['server_address'])) { $row['server_address'] = $_SESSION['domain_name']; }
 				}
 				if (empty($row['sip_transport'])) { $row['sip_transport'] = $_SESSION['provision']['line_sip_transport']['text']; }
-				if (empty($row['sip_port'])) { $row['sip_port'] = $_SESSION['provision']['line_sip_port']['numeric']; }
+				if (!isset($row['sip_port'])) { $row['sip_port'] = $_SESSION['provision']['line_sip_port']['numeric']; }
 				if (empty($row['register_expires'])) { $row['register_expires'] = $_SESSION['provision']['line_register_expires']['numeric']; }
 
 			//add the primary key uuid