How to get JSON API response for call made from twilio?

Question

I am unable to fetch the JSON response as shown in the tutorial.

I have implemented a Programmable Voice program. I want to show the user the details of the call and if I get the JSON response I would be able to get all of them (cost, duration, status, etc).

# views.py
def start_campaign(request, campaign_id):

    try:
        campaign = Campaign.objects.get(pk=campaign_id)
        account_sid = 'XXX'
        auth_token = 'XXX'
        client = Client(account_sid, auth_token)

        phone_numbers = Contact.objects.filter(phone_book=campaign.phone_book)
        custom_url = 'http://XXX.ngrok.io/assets/' + str(campaign_id)

        for phone_number in phone_numbers:

            call = client.calls.create(
                method='GET',
                status_callback='http://XXX.ngrok.io/events',
                status_callback_event='completed',
                status_callback_method='GET',
                url=str(custom_url),
                to=str(phone_number),
                from_='+1XXX'
            )
            detail = client.calls(str(call.sid)).fetch()
            print(detail.price)

    except Campaign.DoesNotExist:
        raise Http404("Campaign Does Not Exist")

    context = {
        'all_campaigns': campaign
    }

    return render(request, "CallCenter/start_campaign.html", context)


def events(request):
    status = request.GET.getlist('CallStatus', default=None)
    duration = request.GET.getlist('CallDuration', default=None)

    print("Duration:{}\nStatus:{}".format(duration, status))

    return render(request, "CallCenter/events.html")

In the terminal, I get a output which prints out the status and duration of the call from

"GET /events?Called=%2BXX&ToState=&CallerCountry=US&Direction=outbound-api&Timestamp=Sat,+12+Oct+2019+19:11:50+%2B0000&CallbackSource=call-progress-events&SipResponseCode=200&Ca llerState=AL&ToZip=&SequenceNumber=0&CallSid=XXX&To=%2BXXX&CallerZip=35766&ToCountry=IN&CalledZip=&ApiVersion=2010-04-01&CalledCity=&CallStatus=completed&Duration=1&From= %2BXXX&CallDuration=5&AccountSid=XXX&CalledCountry=IN&CallerCity=ESTILLFORK&ToCity=&FromCountry=US&Caller=%2B12563804721&FromCity=ESTILLFORK&CalledState=&FromZip=35766&Fro mState=AL HTTP/1.1" 200 123

printing out

Duration:['5', '5']

Status:['completed', 'completed']

Unfortunately, I don't know how to ask for the JSON response from Twilio.

Your question is unclear. You're printing in a completely different view from the one where you make the Twilio call, and what you're printing is what is being sent from your frontend. — Daniel Roseman
@DanielRoseman at ./start-campaign it creates a call resource which calls all the numbers present in the phonebook. Using the status_callback, I tried to create a JSON response as shown in the tutorial(example 3) on Create a Call resource and specify a StatusCallbackEvent, in it sends a GET request to ./events. I tried to follow the tutorial, but I feel that I'm lost. — Ayodele Ashad
But I don't understand why you think there should be a "JSON response". Twilio has called your callback endpoint with the parameters you see, and you've successfully printed two of them. What else are you expecting? — Daniel Roseman
The Twilio python library is already parsing the JSON response into a python object that you can fetch properties from. The call object you have will include all the details. (Although, since you only just created the call, it won't have a duration or price yet. You'll want to store the SID and make the API call once the call is completed.) — philnash
@philnash How to make the API call? I know how to get the SID I'm trying to use if call.status == 'completed': pass. But it is not working and I am unable to find how to approach the problem — Ayodele Ashad

Daniel Roseman Daniel Roseman · Accepted Answer · 2019-10-13T10:57:42

Once the callback is received, you have the CallSid ID in the GET data. So you can use that to fetch the complete Call resource:

def events(request):
    sid = request.GET['CallSid']
    call = client.calls(sid).fetch()
    print(call.price)

How to get JSON API response for call made from twilio?

1 Answers