diff --git a/route/api.twilio.php b/route/api.twilio.php
index 7e39fd9..f4bbe12 100644
--- a/route/api.twilio.php
+++ b/route/api.twilio.php
@@ -3,26 +3,50 @@
  * @file api.twilio.php
  * @date 2019-04-15
  * @author Go Namhyeon <gnh1201@gmail.com>
- * @brief Twilio API controller
- */
+ * @brief Twilio API controller (or domestic API)
+  */
 
-loadHelper("twilio.api");
+loadHelper("twilio.api"); // for voice, or international
+loadHelper("lguplus.api"); // for domestic
+loadHelper("string.utils");
 
 $action = get_requested_value("action", array("_JSON", "_ALL"));
 $message = get_requested_value("message", array("_JSON", "_ALL"));
 $to = get_requested_value("to", array("_JSON", "_ALL"));
 
+$country = get_requested_value("country", array("_JSON", "_ALL"));
+$is_domestic = array_key_equals("lguplus_country", $config, $country);
+if(!$is_domestic) {
+    $to = sprintf("+%s%s", $country, $to);
+}
+
 $response = false;
 
+// temporary filter
+$terms = get_tokenized_text($message);
+if(!(in_array("LNCPLIMSDB", $terms) || in_array("LNCPSRMDBDEV", $terms))) {
+    exit;
+}
+
 switch($action) {
   case "text":
-    $response = twilio_send_message($message, $to);
+    if(!$is_domestic) {
+        $response = twilio_send_message($message, $to);
+    } else {
+        $response = lguplus_send_message($message, $to);
+    }
     break;
 
   case "voice":
     $response = twilio_send_voice($message, $to);
     break;
+
+  default:
+    $response = array("error" => "action is required");
+    break;
 }
 
+write_common_log(sprintf("message: %s, to: %s", $message, $to), "api.twilio");
+
 header("Content-Type: application/json");
 echo json_encode($response);