Twilio で実装する通話状態検知システム - 留守電・電源オフを自動判定

exports.handler = async function(context, event, callback) {
  const twilioClient = context.getTwilioClient();

  try {
    const toNumber = event.to || context.TARGET_PHONE_NUMBER;
    const fromNumber = context.TWILIO_PHONE_NUMBER;

    // StatusCallback URL の構築
    const callbackUrl = `https://${context.DOMAIN_NAME}/call-status`;

    console.log(`通話開始: ${fromNumber} → ${toNumber}`);

    // Call API の実行
    const call = await twilioClient.calls.create({
      from: fromNumber,
      to: toNumber,
      twiml: '<Response><Say language="ja-JP">テスト通話です</Say></Response>',

      // StatusCallback の設定
      statusCallback: callbackUrl,
      statusCallbackEvent: ['initiated', 'ringing', 'answered', 'completed'],

      // AMD の有効化
      machineDetection: 'Enable',
      timeout: 30
    });

    console.log(`Call SID: ${call.sid}`);

    return callback(null, {
      statusCode: 200,
      body: JSON.stringify({
        success: true,
        callSid: call.sid,
        status: call.status
      })
    });

  } catch (error) {
    console.error('通話エラー:', error);
    return callback(error);
  }
};

exports.handler = function(context, event, callback) {
  const { CallSid, CallStatus, AnsweredBy, Duration, SipResponseCode } = event;

  console.log(`=== StatusCallback: ${CallStatus} ===`);
  console.log(`Call SID: ${CallSid}`);

  // 状態に応じた分岐処理
  switch (CallStatus) {
    case 'initiated':
      console.log(`📞 通話開始`);
      break;

    case 'ringing':
      console.log(`🔔 呼び出し中`);
      break;

    case 'answered':
      console.log(`📱 応答検知`);
      break;

    case 'completed':
      console.log(`✅ 通話完了 (${Duration}秒)`);

      if (AnsweredBy === 'machine') {
        console.log(`🤖 留守電検知`);
        // 留守電用の後処理
      } else if (AnsweredBy === 'human') {
        console.log(`👤 人応答検知`);
        // 人応答用の後処理
      }
      break;

    case 'no-answer':
      console.log(`❌ 応答なし (SIP: ${SipResponseCode})`);
      // 電源オフ・圏外の処理
      break;

    case 'busy':
      console.log(`📵 通話中`);
      break;

    case 'failed':
      console.log(`💥 通話失敗 (SIP: ${SipResponseCode})`);
      break;
  }

  // Twilio への応答
  return callback(null, { statusCode: 200, body: 'OK' });
};