voice call ends right away, nexmo hangs up within a second - json

Question

I have created an application in the Nexmo dashboard with an event url and answer url. I run the following code I got from Nexmo´s GitHub:
client = nexmo.Client(key=api_key, secret=api_secret, application_id=application_key, private_key=private_key)
response = client.create_call({
'to': [{'type': 'phone', 'number': 'call_to_number'}],
'from': {'type': 'phone', 'number': 'call_from_number'},
'answer_url': ['http://my_event_url']
})
And the phonenumber is called, but nexmo hangs up right away (within a second without saying anything).
On my server I see Nexmo calls the answer url (with the ncco)
what I do when the answer url is called:
import nexmo
import json
from django.http import JsonResponse
#csrf_exempt
def answer(request):
ncco = [{
"action": "talk",
"voiceName": "Amy",
"text": "Thank you for calling Nexmo. Please leave your message after the tone."
}]
d = json.dumps(ncco)
j = is_json(d)
if j:
MyObject.objects.create(message="valid")
else:
MyObject.objects.create(message=user_ip + "json error")
return JsonResponse(d, status=200, safe=False)
def is_json(myjson):
try:
json_object = json.loads(myjson)
except ValueError:
return False
return True
This is what I do when my event_url is called:
#csrf_exempt
def event(request):
d = json.dumps(request.POST)
DataReceived.objects.create(answer=d)
data = {"ok": True}
return JsonResponse(data, status=200)
The event url is called 5 times by Nexmo but the dictionaries are always empty.

Answer 1

`I think you might be "double JSON dumping" your NCCO,
you create the ncco as a python dict, then turn that into a json string with d = json.dumps(ncco) and then you are calling JsonResponse on it, try passing the ncco object to JsonResponse
return JsonResponse(ncco, status=200, safe=False)