diff --git a/resources/templates/provision/grandstream/gxp2135/{$mac}.xml b/resources/templates/provision/grandstream/gxp2135/{$mac}.xml
index cbeb6c49b6..21c609ecfc 100644
--- a/resources/templates/provision/grandstream/gxp2135/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2135/{$mac}.xml
@@ -42,7 +42,7 @@
 
 <!--  Backup Outbound Proxy -->
 <!--  String -->
-<P2333></P2333>
+<P2333>{$outbound_proxy_secondary_1}</P2333>
 
 <!--  BLF Server -->
 <!--  String -->