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var accountSid = 'YOUR TWILIO ACCOUNTSID';
var authToken = 'YOUR TWILIO AUTHCODE';
var fromNumber = 'YOUR TWILIO PHONE NUMBER';
var toNumber = 'SET PHONE NUMBER CALL TO';
var configUrl = 'http://twimlets.com/echo?Twiml=%3CResponse%3E%0A%3CSay%3E%20This%20is%20emergency%20call.%20This%20is%20emergency%20call.%20%3C%2FSay%3E%0A%3CSay%3E%20IoT%20button%20is%20pushed%2C%20escape%20now.%20%3C%2FSay%3E%0A%3C%2FResponse%3E&';

var https = require('https');
var queryString = require('querystring');

exports.handler = function (event, context) {
  console.log('Start twilio call');

  callTwilio(function(status) {
    context.done(null, status);
  });
};

function callTwilio(callback) {
  var messageString = queryString.stringify({
    From: fromNumber,
    To: toNumber,
    Url: configUrl,
    Method: 'GET'
  });

  var options = {
    host: 'api.twilio.com',
    port: 443,
    path: '/2010-04-01/Accounts/' + accountSid + '/Calls.json',
    method: 'POST',
    headers: {
      'Authorization': 'Basic ' + new Buffer(accountSid + ':' + authToken).toString('base64'),
      'Content-Type': 'application/x-www-form-urlencoded',
      'Content-Length': Buffer.byteLength(messageString)
    }
  };

  var req = https.request(options, function(res) {
    res.setEncoding('utf-8');

    var responseString = '';
    res.on('data', function(data) {
      responseString += data;
    });

    res.on('end', function() {
      console.log('Twilio Response: ' + responseString);
      callback('API request sent successfully.');
    });
  });

  req.on('error', function(e) {
    console.error('HTTP error: ' + e.message);
    callback('API request completed with error(s).');
  });

  console.log('Twilio API call: ' + messageString);
  req.write(messageString);
  req.end();
}