Twilio 语音回拨

Question

I'm having a tough time getting the Twilio Voice callback function to work properly, and would greatly appreciate any assistance in resolving this.

I have a working VOIP webapp using Python, twilio package and twilio voice SDK.

I need to get call status when a call is being made: answered, completed, ringing, in-progress and the likes.

is_record = fetch_recording_data_from_DB
handle_url = '/handle'
callback_url = '/events'
events = 'answered ringing initiated completed'

#incoming call 
dial = Dial(timeout=15, record='record-from-ringing' if is_record else 'false', action=handle_url)
        dial.client(
                identity=contact_data['company_id'] or company_id,
                status_callback_event = events,
                status_callback = callback_url,
                status_callback_method = 'POST'
            )

        return response.append(dial)

The handle_url is triggered after call ends or the 20s is exhausted with no answer to determine whether to make a call forwarding or play VM, this works fine. No error whatsoever, calls come in - I answer and talk for a while, if I don't, it goes to voicemail, records and hangs up. I see my recording, cost, duration and other data on the calls tab on Twilio console, under Monitor. All fine. I just can't get the status callback bit.

#status callback function
def stat_events():
    return request.values, {'Content-Type': 'text/xml'}

.....

class StatEvents(Resource):
    def post(self):
        return stat_events()

Now, on the Twilio console, I can see the response and the other information (fromstate, sequencenumber,...) under Request Inspector (multiple times, as it should be) xdxxdxd.ngrok.io/events (POST, 200) regarding the call, but on my network tab (chrome) (when I make a call on the frontend) I check under the events network and see {} - empty

I tried console.log() on the events, nothing. so either I am not using this option well or there's something magical at play.

I need the status so I can save the call log to my DB (background task) when it's completed or no-answer .

data I want but it's only showing up on Twilio console and empty on network tab (apart from saving call log, I need this data to show the status on the front-end):

    "Called": "+653xxxxxx",
    "ParentCallSid": "CAd1ed07xxxxxxxxxxxxxxx",
    "ToState": "",
    "CallerCountry": "US",
    "Direction": "outbound-dial",
    "Timestamp": "Fri, 22 Jul 2022 08:58:56 +0000",
    "CallbackSource": "call-progress-events",
    "CallerState": "MI",
    "ToZip": "",
    "SequenceNumber": "0",
    "CallSid": "CA3a39c6b1xxxxxxxxxxxxxx",
    "To": "+653xxxxxxxx",
    "CallerZip": "",
    "ToCountry": "SG",
    "CalledZip": "",
    "ApiVersion": "2010-04-01",
    "CalledCity": "",
    "CallStatus": "initiated",
    "From": "+194xxxxxxx",
    "AccountSid": "ACb9f4fe8f52xxxxxxxxxxxxx",
    "CalledCountry": "SG",
    "CallerCity": "",
    "ToCity": "",
    "FromCountry": "US",
    "Caller": "+1947xxxxxx",
    "FromCity": "",
    "CalledState": "",
    "FromZip": "",
    "FromState": "MI"
}```

```handle_url```'s function uses ```DialCallStatus``` in place of ```CallStatus```, as I read that this would be sent by Twilio request to the endpoint.

Answer 1

Events looks to be a list:

status_callback_event=['initiated', 'answered']

Answer 2

You describe that you are receiving requests to your /events webhook, but that you're not getting events in the browser.

When you register to receive events via a status_callback_url then those events are only sent as webhooks to your server.

However, if you have implemented the Twilio Voice SDK in JavaScript, then you can get call events by listening to events on the Twilio.Device object and on Twilio.Call objects . For example, the Twilio.Device will emit the incoming event when there is a new incoming call. And the Twilio.Call will emit accept events when an incoming call is accepted, and disconnect for when a call is over.

You can use these events to show call progress in your UI.