diff --git a/resources/templates/provision/yealink/w7xp/{$mac}.cfg b/resources/templates/provision/yealink/w7xp/{$mac}.cfg
index 2e2881fbef..683ff3f77b 100644
--- a/resources/templates/provision/yealink/w7xp/{$mac}.cfg
+++ b/resources/templates/provision/yealink/w7xp/{$mac}.cfg
@@ -142,14 +142,15 @@ account.1.dtmf.info_type =
 ##                                   NAT Settings                                    ##
 #######################################################################################
 
+
 #Enable or disable the NAT traversal; 0-Disabled (default), 1-STUN;
-account.1.nat.nat_traversal = {if isset($stun_server)}1{else}0{/if}{""}
+account.1.nat.nat_traversal = {if isset($stun_server)}1{else}0{/if}
 
 #Configure the STUN server address.
-account.1.nat.stun_server = {$stun_server}
+account.1.nat.stun_server = {if isset($stun_server)}{$stun_server}{/if}
 
 #Configure the STUN server port, the default value is 3478.
-account.1.nat.stun_port = {if isset($stun_port)}{$stun_port}{else}3478{/if}{""}
+account.1.nat.stun_port = {if isset($stun_port)}{$stun_port}{else}3478{/if}
 
 #Enable or disable the NAT keep-alive; 0-Disabled, 1-Default (default), 2-Option, 3-Notify;
 account.1.nat.udp_update_enable = {if isset($account.1.password)}{if isset($yealink_udp_update_enable)}{$yealink_udp_update_enable}{else}3{/if}{else}1{/if}{""}