问检索的Answered_By响应为null

EN

 {"sid": "MYSID", 
  "to": "+1845555555", 
  "to_formatted": "(845) 555-5555", 
  "from": "+18569972628", "from_formatted": "(856) 997-2628", 
  "phone_number_sid": null, 
  "status": "queued"
  "start_time": null, 
  "end_time": null, 
  "duration": null, 
  "price": null, 
  "price_unit": "USD", 
  "direction": "outbound-api", 
  "answered_by": null, 
  "api_version": "2010-04-01", 
  "annotation": null, 
  "forwarded_from": null, 
  "group_sid": null, "caller_name": null, 
  "uri": "/2010-04-01/Accounts/mySIDaccount/Calls/C
            A303d158baf885d4480284d4529ce49a8.json", 
  "subresource_uris": 
       {"notifications": "/2010-04\ 
                     01/Accounts/myaccount/Calls/\
                            CA303d158baf885d448028\
                    4d4529ce49a8/Notifications.json", 
  "recordings": "/2010-04 \
                   01/Accounts/myaccount/Calls/\
                 CA303d158baf885d4480284d4529ce49a8/Recordings.json"}
  }

var request = require('request-promise');

request.post({url:  'https://api.twilio.com/2010-04-01/Accounts/'+
          config.accountSid+"/Calls.json",
          form: {To: phoneNumber,
                From: config.twilioNumber,
            MachineDetection: 'Enable',
            MachineDetectionTimout: 5,
            Url: url},
          auth: {user: config.accountSid,
                 pass: config.authToken
             },
          timeout: 10000
          }).then(function(parsedBody){
                console.log('\n\n\n\n'+parsedBody+'\n\n\n\n');
             response.send({message: 'Transferring...'});
             }).catch(function(parsedBody){
                console.log(parsedBody);
                response.status(500).send(parsedBody);
        });
});