diff --git a/resources/templates/provision/grandstream/grp2612/{$mac}.xml b/resources/templates/provision/grandstream/grp2612/{$mac}.xml
index 05a8a23214..9126e7f867 100644
--- a/resources/templates/provision/grandstream/grp2612/{$mac}.xml
+++ b/resources/templates/provision/grandstream/grp2612/{$mac}.xml
@@ -3304,7 +3304,11 @@
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
 		<!-- Pvalue P8393 -->
-		<item name="features.history.missedCallNotification">Yes</item>
+		{if isset($grandstream_missed_call_notification)}
+		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<!-- Pvalue P8391 -->
diff --git a/resources/templates/provision/grandstream/grp2612w/{$mac}.xml b/resources/templates/provision/grandstream/grp2612w/{$mac}.xml
index fc6943d226..a7a50b2d21 100644
--- a/resources/templates/provision/grandstream/grp2612w/{$mac}.xml
+++ b/resources/templates/provision/grandstream/grp2612w/{$mac}.xml
@@ -3304,7 +3304,11 @@
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
 		<!-- Pvalue P8393 -->
-		<item name="features.history.missedCallNotification">Yes</item>
+		{if isset($grandstream_missed_call_notification)}
+		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<!-- Pvalue P8391 -->
diff --git a/resources/templates/provision/grandstream/grp2613/{$mac}.xml b/resources/templates/provision/grandstream/grp2613/{$mac}.xml
index c7f92e3630..498035f90d 100644
--- a/resources/templates/provision/grandstream/grp2613/{$mac}.xml
+++ b/resources/templates/provision/grandstream/grp2613/{$mac}.xml
@@ -3304,7 +3304,11 @@
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
 		<!-- Pvalue P8393 -->
-		<item name="features.history.missedCallNotification">Yes</item>
+		{if isset($grandstream_missed_call_notification)}
+		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<!-- Pvalue P8391 -->
diff --git a/resources/templates/provision/grandstream/grp2614/{$mac}.xml b/resources/templates/provision/grandstream/grp2614/{$mac}.xml
index 05a8a23214..9126e7f867 100644
--- a/resources/templates/provision/grandstream/grp2614/{$mac}.xml
+++ b/resources/templates/provision/grandstream/grp2614/{$mac}.xml
@@ -3304,7 +3304,11 @@
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
 		<!-- Pvalue P8393 -->
-		<item name="features.history.missedCallNotification">Yes</item>
+		{if isset($grandstream_missed_call_notification)}
+		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<!-- Pvalue P8391 -->
diff --git a/resources/templates/provision/grandstream/grp2615/{$mac}.xml b/resources/templates/provision/grandstream/grp2615/{$mac}.xml
index 05a8a23214..9126e7f867 100644
--- a/resources/templates/provision/grandstream/grp2615/{$mac}.xml
+++ b/resources/templates/provision/grandstream/grp2615/{$mac}.xml
@@ -3304,7 +3304,11 @@
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
 		<!-- Pvalue P8393 -->
-		<item name="features.history.missedCallNotification">Yes</item>
+		{if isset($grandstream_missed_call_notification)}
+		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<!-- Pvalue P8391 -->
diff --git a/resources/templates/provision/grandstream/grp2616/{$mac}.xml b/resources/templates/provision/grandstream/grp2616/{$mac}.xml
index 05a8a23214..9126e7f867 100644
--- a/resources/templates/provision/grandstream/grp2616/{$mac}.xml
+++ b/resources/templates/provision/grandstream/grp2616/{$mac}.xml
@@ -3304,7 +3304,11 @@
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
 		<!-- Pvalue P8393 -->
-		<item name="features.history.missedCallNotification">Yes</item>
+		{if isset($grandstream_missed_call_notification)}
+		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<!-- Pvalue P8391 -->
diff --git a/resources/templates/provision/grandstream/gxp2130/{$mac}.xml b/resources/templates/provision/grandstream/gxp2130/{$mac}.xml
index 960170c361..4f808b01e4 100644
--- a/resources/templates/provision/grandstream/gxp2130/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2130/{$mac}.xml
@@ -2214,7 +2214,11 @@
 		<item name="sip.showError">Yes</item>
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
+		{if isset($grandstream_missed_call_notification)}
 		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<item name="call.dial.callComplete.enable"/>
diff --git a/resources/templates/provision/grandstream/gxp2135/{$mac}.xml b/resources/templates/provision/grandstream/gxp2135/{$mac}.xml
index 28ab42ad7b..42a9dad723 100644
--- a/resources/templates/provision/grandstream/gxp2135/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2135/{$mac}.xml
@@ -2214,7 +2214,11 @@
 		<item name="sip.showError">Yes</item>
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
+		{if isset($grandstream_missed_call_notification)}
 		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<item name="call.dial.callComplete.enable"/>
diff --git a/resources/templates/provision/grandstream/gxp2140/{$mac}.xml b/resources/templates/provision/grandstream/gxp2140/{$mac}.xml
index 7d37b5a672..01809835ac 100644
--- a/resources/templates/provision/grandstream/gxp2140/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2140/{$mac}.xml
@@ -2214,7 +2214,11 @@
 		<item name="sip.showError">Yes</item>
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
+		{if isset($grandstream_missed_call_notification)}
 		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<item name="call.dial.callComplete.enable"/>
diff --git a/resources/templates/provision/grandstream/gxp2160/{$mac}.xml b/resources/templates/provision/grandstream/gxp2160/{$mac}.xml
index 39d51c3897..372733e821 100644
--- a/resources/templates/provision/grandstream/gxp2160/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2160/{$mac}.xml
@@ -2214,7 +2214,11 @@
 		<item name="sip.showError">Yes</item>
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
+		{if isset($grandstream_missed_call_notification)}
 		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<item name="call.dial.callComplete.enable"/>
diff --git a/resources/templates/provision/grandstream/gxp2170/{$mac}.xml b/resources/templates/provision/grandstream/gxp2170/{$mac}.xml
index fdd0fa5e5d..60ed84b7b8 100644
--- a/resources/templates/provision/grandstream/gxp2170/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2170/{$mac}.xml
@@ -2214,7 +2214,11 @@
 		<item name="sip.showError">Yes</item>
 
 		<!-- # Enable Missed Call Notification. Yes or No -->
+		{if isset($grandstream_missed_call_notification)}
 		<item name="features.history.missedCallNotification">{$grandstream_missed_call_notification}</item>
+		{else}
+		<item name="features.history.missedCallNotification">No</item>
+		{/if}
 
 		<!-- # Enable Call Completion Service. Yes or No -->
 		<item name="call.dial.callComplete.enable"/>