text: // Download the Node helper library from twilio.com/docs/node/install
  // These identifiers are your accountSid and authToken from
  // https://www.twilio.com/console
  const accountSid = 'ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';
  const authToken = 'your_auth_token';
  const client = require('twilio')(accountSid, authToken);
  
  const filterOpts = {
    status: 'in-progress',
    startTimeAfter: '2016-07-04',
    startTimeBefore: '2016-07-06',
  };
  
  client.calls.each(filterOpts, call => console.log(call.direction));
  