Browser Calls with Python and Django

Download the Code

This Django web application shows how you can use Twilio Client to make browser-to-phone and browser-to-browser calls.

Browser Calls home page

This application powers the support site for the Birchwood Bicycle Polo Co., which sells equipment to those who play "the sport of kings." It has three main features:

  • Unsatisfied customers can submit support tickets with their phone number and their problem
  • Support agents can call customers' phones from their browser to follow up on support tickets
  • Customers can also use their browser to speak with support agents live when available

In this tutorial, we'll point out the key bits of code that make this application work. Check out the project README on GitHub to see how to run the code yourself.

Learn how Zendesk uses Twilio Client to make phone support available in 40+ countries.

Submit a support ticket

The home page of our app displays a form for customers to submit support tickets. We use one of Django's generic class-based views, CreateView to power the page.

The SupportTicket model itself has just a few fields. The phone_number field uses the django-phonenumber-field library.

class SupportTicket(models.Model):
    """A support ticket submitted by an unsatisfied customer"""

    name = models.CharField(max_length=100)
    phone_number = PhoneNumberField()
    description = models.TextField()

    timestamp = models.DateTimeField(auto_now_add=True)
Loading Code Samples...
Language
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
browser_calls/views.py
Submit a support ticket

browser_calls/views.py

Now we can create a ticket. Next up, let's work on the dashboard for the support agent.

The support dashboard

When a support agent visits /support/dashboard, they see all the support tickets which have been submitted.

Browser Calls support dashboard

Each ticket also has a "Call Customer" button which invokes a JavaScript function we wrote named callCustomer(). That function kicks off a Twilio Client call to the phone number passed as its sole parameter.

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{% extends "base.html" %}

{% load bootstrap_tags %}

{% block title %}Support Dashboard{% endblock title %}

{% block content %}
  <div class="container">

    <h2>Support Tickets</h2>

    <p class="lead">
      This is the list of most recent support tickets. Click the "Call customer" button to start a phone call from your browser.
    </p>

    <div class="row">

      <div class="col-md-4 col-md-push-8">
        <div class="panel panel-primary client-controls">
          <div class="panel-heading">
            <h3 class="panel-title">Make a call</h3>
          </div>
          <div class="panel-body">
            <p><strong>Status</strong></p>
            <div class="well well-sm" id="call-status">
              Connecting to Twilio...
            </div>

            <button class="btn btn-lg btn-success answer-button" disabled>Answer call</button>
            <button class="btn btn-lg btn-danger hangup-button" disabled onclick="hangUp()">Hang up</button>
          </div>
        </div>
      </div>

      <div class="col-md-8 col-md-pull-4">
        {% for ticket in support_tickets %}
          <div class="panel panel-default">
            <div class="panel-heading">
              <h3 class="panel-title">Ticket #{{ ticket.id }} <small class="pull-right">{{ ticket.timestamp }}</small></h3>
            </div>

            <div class="panel-body">

              <div class="pull-right">
                <button onclick="callCustomer('{{ ticket.phone_number }}')" type="button" class="btn btn-primary btn-lg call-customer-button">
                  <span class="glyphicon glyphicon-earphone" aria-hidden="true"></span>  Call customer
                </button>
              </div>

              <p><strong>Name:</strong> {{ ticket.name }}</p>
              <p><strong>Phone number:</strong> {{ ticket.phone_number.as_international }}</p>
              <p><strong>Description:</strong></p>
              {{ ticket.description|linebreaks }}

            </div>
          </div>
        {% endfor %}
      </div>

    </div>
  </div>
{% endblock %}
templates/browser_calls/support_dashboard.html
The support dashboard

templates/browser_calls/support_dashboard.html

Great, now we have an interface good enough for our support agents. Next up, in order to let our agents make calls to their customers through the browser, we need to provide them a capability token.

Generate a capability token

We use the Twilio Python helper library to generate and configure our capability tokens. To allow our support agents to call the phone numbers on our tickets, we use the allow_client_outgoing() method.

That method requires an identifier for a TwiML Application. Twilio will send a POST request to our backend every time a user makes a Twilio Client call — the TwiML Application tells Twilio which URL to send that request to.

Loading Code Samples...
Language
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
browser_calls/views.py
Generate a capability token

browser_calls/views.py

Once we are equipped with our Capability Token, the next step is to set up the Twilio Device Client in the browser.

Setting up a Twilio Device Client

To use the Twilio Device Client in a web browser we use the twilio.js library.

We start by retrieving a capability token from the view we defined in the previous step with a POST request through AJAX. Then we enable the Twilio Device Client for this page by passing our token to Twilio.Device.setup().

After that the Twilio.Device.ready() callback will let us know when the browser is ready to make and receive calls.

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/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
browser_calls/static/js/browser-calls.js
Setting up a Twilio Device Client

browser_calls/static/js/browser-calls.js

Now that we have almost everything in place, it's time to see the core of this tutorial. Let's look at how we can let our agents start a call from their browsers.

Calling a Customer (browser-to-phone)

When our support agents click on the Call Customer button on a support ticket, the function highlighted on the code snippet will initiate the call.

We use Twilio.Device.connect() to begin a new outgoing call. Our backend will tell Twilio how to handle this call, so we include a phoneNumber parameter that we'll use on our Connect route.

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/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
browser_calls/static/js/browser-calls.js
Calling a Customer (browser-to-phone)

browser_calls/static/js/browser-calls.js

Great! Now our agents are able to make calls to their customers. Next up, let's look at how to connect that call to a phone number.

Connect the call to a phone number

Whenever one of our users makes a call, Twilio will send a POST request to the URL we set on our TwiML Application - in this case, /support/call.

We use TwiML to respond to the request and tell Twilio how to handle the call. Twilio will pass along the phoneNumber parameter from the previous step in its request, which we will then Dial in our TwiML.

Loading Code Samples...
Language
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
browser_calls/views.py
Connect the call to a phone number

browser_calls/views.py

After our call view responds, Twilio completes the connection between our support agent's browser and the customer's phone. Let's go back to the browser and look at how to notify the agent of a call in progress.

The call is live

We use the Twilio.Device.connect() callback to update some UI elements to notify our users that they are in a call. This function receives a Connection object, which offers some additional details about the call.

Loading Code Samples...
Language
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
browser_calls/static/js/browser-calls.js
Indicating a live call

browser_calls/static/js/browser-calls.js

And that's all for our browser-to-phone example. Next up, we will go even further and show a browser-to-browser example.

Call a support agent (browser-to-browser)

Support tickets are useful, but sometimes a customer needs help right now. With just a little more work we let customers speak with a support agent live via a browser-to-browser call.

Browser Calls call support

When a customer clicks the Call support button on the home page we again use Twilio.Device.connect() to initiate the call. This time we don't pass any additional parameters — our backend will route this call to our support agent.

Loading Code Samples...
Language
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
browser_calls/static/js/browser-calls.js
Call a support agent (browser-to-browser)

browser_calls/static/js/browser-calls.js

Setting up the browser-to-browser call was rather simple right? Now let's look at how our backend will route this call to our support agent.

Connect the call to the support agent's client

To allow our support agents to accept incoming calls we use the allow_client_incoming() method when generating their capability token. We have to also pass support_agent as the client's name to this method.

When Twilio sends a POST request to our call view, we can connect the call to our support agent by responding with a <Client> TwiML noun and the support_agent name.

Loading Code Samples...
Language
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
browser_calls/views.py
Connect the call to the support agent's client

browser_calls/views.py

That's how we prepare everything for accepting incoming calls. Now we should go back in the browser and see how to handle the connection this time.

Answering the call

When our support agent's client receives an incoming call, it will trigger the function we defined on the Twilio.Device.incoming() callback.

The incoming connection will be in a pending state until we invoke its .accept() method, which we do in a function bound to the Answer Call button.

We also set a .accept() callback to update the UI once the call is live.

Loading Code Samples...
Language
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
browser_calls/static/js/browser-calls.js
Answering the call

browser_calls/static/js/browser-calls.js

Great! Now we know how to work on both cases: browser-to-phone and browser-to-browser calls! Next up, we will see what happens when they decide to hang up the call.

Hanging up the Call

In order to finish a call we invoke Twilio.Device.disconnectAll(), which we wired to the Hang up button in our UI.

We also pass a callback function to Twilio.Device.disconnect() above, to reset some UI elements.

Loading Code Samples...
Language
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
browser_calls/static/js/browser-calls.js
Hanging up the Call

browser_calls/static/js/browser-calls.js

That's it! Our Django application now powers browser-to-phone and browser-to-browser calls using Twilio Client.

Where to next?

If you're a Python developer working with Twilio, you might also enjoy these tutorials:

Click-To-Call (Flask)

Put a button on your web page that connects visitors to live support or sales people via telephone.

Automated Survey (Django)

Instantly collect structured data from your users with a survey conducted over a voice call or SMS text messages.

Did this help?

Thanks for checking this tutorial out! If you have any feedback to share with us please contact us on Twitter, we'd love to hear it.

Andrew Baker
Jose Oliveros
Samuel Mendes
David Prothero
Agustin Camino

Need some help?

We all do sometimes; code is hard. Get help now from our support team, or lean on the wisdom of the crowd browsing the Twilio tag on Stack Overflow.

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Loading Code Samples...
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
{% extends "base.html" %}

{% load bootstrap_tags %}

{% block title %}Support Dashboard{% endblock title %}

{% block content %}
  <div class="container">

    <h2>Support Tickets</h2>

    <p class="lead">
      This is the list of most recent support tickets. Click the "Call customer" button to start a phone call from your browser.
    </p>

    <div class="row">

      <div class="col-md-4 col-md-push-8">
        <div class="panel panel-primary client-controls">
          <div class="panel-heading">
            <h3 class="panel-title">Make a call</h3>
          </div>
          <div class="panel-body">
            <p><strong>Status</strong></p>
            <div class="well well-sm" id="call-status">
              Connecting to Twilio...
            </div>

            <button class="btn btn-lg btn-success answer-button" disabled>Answer call</button>
            <button class="btn btn-lg btn-danger hangup-button" disabled onclick="hangUp()">Hang up</button>
          </div>
        </div>
      </div>

      <div class="col-md-8 col-md-pull-4">
        {% for ticket in support_tickets %}
          <div class="panel panel-default">
            <div class="panel-heading">
              <h3 class="panel-title">Ticket #{{ ticket.id }} <small class="pull-right">{{ ticket.timestamp }}</small></h3>
            </div>

            <div class="panel-body">

              <div class="pull-right">
                <button onclick="callCustomer('{{ ticket.phone_number }}')" type="button" class="btn btn-primary btn-lg call-customer-button">
                  <span class="glyphicon glyphicon-earphone" aria-hidden="true"></span>  Call customer
                </button>
              </div>

              <p><strong>Name:</strong> {{ ticket.name }}</p>
              <p><strong>Phone number:</strong> {{ ticket.phone_number.as_international }}</p>
              <p><strong>Description:</strong></p>
              {{ ticket.description|linebreaks }}

            </div>
          </div>
        {% endfor %}
      </div>

    </div>
  </div>
{% endblock %}
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse, JsonResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import CreateView
from twilio.twiml.voice_response import Dial
from twilio.jwt.client import ClientCapabilityToken

from .models import SupportTicket


class SupportTicketCreate(SuccessMessageMixin, CreateView):
    """Renders the home page and the support ticket form"""
    model = SupportTicket
    fields = ['name', 'phone_number', 'description']
    template_name = 'index.html'
    success_url = reverse_lazy('home')
    success_message = "Your ticket was submitted! An agent will call you soon."


def support_dashboard(request):
    """Shows the list of support tickets to a support agent"""
    context = {}

    context['support_tickets'] = SupportTicket.objects.order_by('-timestamp')

    return render(request, 'browser_calls/support_dashboard.html', context)


def get_token(request):
    """Returns a Twilio Client token"""
    # Create a TwilioCapability token with our Twilio API credentials
    capability = ClientCapabilityToken(
        settings.TWILIO_ACCOUNT_SID,
        settings.TWILIO_AUTH_TOKEN)

    # Allow our users to make outgoing calls with Twilio Client
    capability.allow_client_outgoing(settings.TWIML_APPLICATION_SID)

    # If the user is on the support dashboard page, we allow them to accept
    # incoming calls to "support_agent"
    # (in a real app we would also require the user to be authenticated)
    if request.GET['forPage'] == reverse('dashboard'):
        capability.allow_client_incoming('support_agent')
    else:
        # Otherwise we give them a name of "customer"
        capability.allow_client_incoming('customer')

    # Generate the capability token
    token = capability.generate()

    return JsonResponse({'token': token})


@csrf_exempt
def call(request):
    """Returns TwiML instructions to Twilio's POST requests"""
    response = Dial(caller_id=settings.TWILIO_NUMBER)

    # If the browser sent a phoneNumber param, we know this request
    # is a support agent trying to call a customer's phone
    if 'phoneNumber' in request.POST:
        response.number(request.POST['phoneNumber'])
    else:
        # Otherwise we assume this request is a customer trying
        # to contact support from the home page
        response.client('support_agent')

    return HttpResponse(str(response))
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}
/**
 * Twilio Client configuration for the browser-calls-django
 * example application.
 */

// Store some selectors for elements we'll reuse
var callStatus = $("#call-status");
var answerButton = $(".answer-button");
var callSupportButton = $(".call-support-button");
var hangUpButton = $(".hangup-button");
var callCustomerButtons = $(".call-customer-button");

/* Helper function to update the call status bar */
function updateCallStatus(status) {
    callStatus.text(status);
}

/* Get a Twilio Client token with an AJAX request */
$(document).ready(function() {
    $.get("/support/token", {forPage: window.location.pathname}, function(data) {
        // Set up the Twilio Client Device with the token
        Twilio.Device.setup(data.token);
    });
});

/* Callback to let us know Twilio Client is ready */
Twilio.Device.ready(function (device) {
    updateCallStatus("Ready");
});

/* Report any errors to the call status display */
Twilio.Device.error(function (error) {
    updateCallStatus("ERROR: " + error.message);
});

/* Callback for when Twilio Client initiates a new connection */
Twilio.Device.connect(function (connection) {
    // Enable the hang up button and disable the call buttons
    hangUpButton.prop("disabled", false);
    callCustomerButtons.prop("disabled", true);
    callSupportButton.prop("disabled", true);
    answerButton.prop("disabled", true);

    // If phoneNumber is part of the connection, this is a call from a
    // support agent to a customer's phone
    if ("phoneNumber" in connection.message) {
        updateCallStatus("In call with " + connection.message.phoneNumber);
    } else {
        // This is a call from a website user to a support agent
        updateCallStatus("In call with support");
    }
});

/* Callback for when a call ends */
Twilio.Device.disconnect(function(connection) {
    // Disable the hangup button and enable the call buttons
    hangUpButton.prop("disabled", true);
    callCustomerButtons.prop("disabled", false);
    callSupportButton.prop("disabled", false);

    updateCallStatus("Ready");
});

/* Callback for when Twilio Client receives a new incoming call */
Twilio.Device.incoming(function(connection) {
    updateCallStatus("Incoming support call");

    // Set a callback to be executed when the connection is accepted
    connection.accept(function() {
        updateCallStatus("In call with customer");
    });

    // Set a callback on the answer button and enable it
    answerButton.click(function() {
        connection.accept();
    });
    answerButton.prop("disabled", false);
});

/* Call a customer from a support ticket */
function callCustomer(phoneNumber) {
    updateCallStatus("Calling " + phoneNumber + "...");

    var params = {"phoneNumber": phoneNumber};
    Twilio.Device.connect(params);
}

/* Call the support_agent from the home page */
function callSupport() {
    updateCallStatus("Calling support...");

    // Our backend will assume that no params means a call to support_agent
    Twilio.Device.connect();
}

/* End a call */
function hangUp() {
    Twilio.Device.disconnectAll();
}