diff --git a/resources/templates/provision/polycom/4.x/{$mac}.cfg b/resources/templates/provision/polycom/4.x/{$mac}.cfg
index 4b91fa1e5d..951bad3d30 100644
--- a/resources/templates/provision/polycom/4.x/{$mac}.cfg
+++ b/resources/templates/provision/polycom/4.x/{$mac}.cfg
@@ -115,6 +115,8 @@
 	<GENERAL
 		nat.keepalive.interval="30"
 		voIpProt.SIP.specialEvent.checkSync.alwaysReboot="1"
+		voIpProt.SIP.requestValidation.1.request="INVITE" 
+		voIpProt.SIP.requestValidation.1.method="source"
 		feature.broadsoftUcOne.enabled="0"
 		voice.volume.persist.handset="1"
 		voice.volume.persist.handsfree="1"