diff --git a/kamailio/registrar-role.cfg b/kamailio/registrar-role.cfg
index e43cf08..0dab254 100644
--- a/kamailio/registrar-role.cfg
+++ b/kamailio/registrar-role.cfg
@@ -154,4 +154,15 @@ route[ATTEMPT_AUTHORIZATION]
     exit;
 }
 
+## kazoo event route , {"directory", "reg_flush")  => reg-flush by kamailio limitations
+## when a Event-Category or Event-Name has a underscore (_) we need to declare it with a dash (-) 
+event_route[kazoo:consumer-event-directory-reg-flush]
+{
+    $var(user) = $(kzE{kz.json,Username}) + "@" + $(kzE{kz.json,Realm});
+    if ($sht(auth_cache=>$var(user)) != $null) {
+        xlog("L_INFO", "log|removing SIP credentials cache for $var(user)");
+        $sht(auth_cache=>$var(user)) = $null;
+    }
+}
+
 # vim: tabstop=4 softtabstop=4 shiftwidth=4 expandtab