diff --git a/resources/templates/provision/yealink/t21p/y000000000052.cfg b/resources/templates/provision/yealink/t21p/y000000000052.cfg
index 922832fd03..9ca8c5b157 100644
--- a/resources/templates/provision/yealink/t21p/y000000000052.cfg
+++ b/resources/templates/provision/yealink/t21p/y000000000052.cfg
@@ -1355,7 +1355,7 @@ distinctive_ring_tones.alert_info.1.ringer =
 ##                                   Call Waiting                                    ##
 #######################################################################################
 #Enable or disable the call waiting feature; 0-Disabled, 1-Enabled (default);
-call_waiting.enable =
+call_waiting.enable = {$call_waiting}
 #Enable or disable the playing of call waiting tone; 0-Disabled, 1-Enabled (default);
 call_waiting.tone =