diff --git a/resources/templates/provision/grandstream/ht704/{$mac}.xml b/resources/templates/provision/grandstream/ht704/{$mac}.xml
index 9db23a49f6..2a68a443b7 100644
--- a/resources/templates/provision/grandstream/ht704/{$mac}.xml
+++ b/resources/templates/provision/grandstream/ht704/{$mac}.xml
@@ -396,7 +396,7 @@
 <!-- Register Expiration (in minutes. default 1 hour, max 45 days)-->
 <!-- Number: 1 to 64800-->
 <!-- Mandatory-->
-<P32>3</P32>
+<P32>{math equation="x / y" x=$account.1.register_expires y=40}</P32>
 
 <!-- Reregister before Expiration (in seconds. Default 0 second)-->
 <!-- Number: 1 to 64800-->
@@ -1057,7 +1057,7 @@
 <!-- Register Expiration (in minutes. default 1 hour, max 45 days) -->
 <!-- Number: 1 to 64800 -->
 <!-- Mandatory -->
-<P732>3</P732>
+<P732>{math equation="x / y" x=$account.2.register_expires y=40}</P732>
 
 <!-- Reregister before Expiration (in seconds. Default 0 second) -->
 <!-- Number: 1 to 64800 -->