unregister device on directory flush (#167)

kamailio/registrar-role.cfg

@@ -299,11 +299,21 @@ route[SAVE_LOCATION]
 event_route[kazoo:consumer-event-directory-reg-flush]
 {
     $var(user) = $(kzE{kz.json,Username}) + "@" + $(kzE{kz.json,Realm});
+    xlog("L_INFO", "$(kzE{kz.json,Msg-ID})|log|received directory flush for $var(user)\n");
     if ($sht(auth_cache=>$var(user)) != $null) {
-        xlog("L_INFO", "log|removing SIP credentials cache for $var(user)\n");
         $sht(auth_cache=>$var(user)) = $null;
     }
 
+    if(reg_fetch_contacts("location", "sip:$var(user)", "caller")) {
+       $var(i) = 0;
+       while($var(i) < $(ulc(caller=>count))) {
+          unregister("location", "sip:$(ulc(caller=>aor))", "$(ulc(caller=>ruid)[$var(i)])");
+          $var(i) = $var(i) + 1;
+       }
+       reg_free_contacts("caller");
+    }
+    
+
     #!ifdef ANTIFLOOD_ROLE
     route(ANTIFLOOD_RESET_AUTH);
     #!endif