Get Started with Python

Python & Flask

Get Started with Python Using Flask Framework

Start by signing up for a free trial account that you can use to experiment with and learn about our services. The free trial account comes with free credits, and you can add more as you go along. You can also add a phone number to your account to start testing the full range of our voice and SMS features. A page in our support portal walks you through the signup process.

You can start making and receiving calls either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

Using PHLO

Set up your Python Flask dev environment

You must set up and install Python, Flask, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install Flask and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mypythonapp
$ cd mypythonapp

Install the modules using pip.

pip install flask plivo

Alternatively, you can download the Plivo source code from this repo and run

python setup.py install

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Make your first outbound call

You can create and deploy a PHLO to make an outbound call with a few clicks on the PHLO canvas, and trigger it with some simple code.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Initiate Call component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s API Request trigger state to the Initiate Call node.

• In the Configuration pane at the right of the canvas, configure the Initiate Call node with a caller ID in the From field. Enter the destination number you wish to call in the To field.

  Note: You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through Liquid

  templating parameters when you trigger the PHLO from your application.

• Once you’ve configured the node, click Validate to save the configuration.

• Similarly, create a node from the Play Audio component. Connect the Initiate Call node to the Play Audio node using the Answered trigger state.

• Configure the Play Audio node to play a message to the user by entering text in the Speak Text box in the Prompt section of the Configuration pane — for example, “Hello, you just received your first call.”

• Connect the Initiate Call node’s Answered trigger state to the Play Audio node.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

Your PHLO is now ready to test.

Trigger the PHLO

You integrate a PHLO into your application workflow by making an API request to trigger the PHLO with the required payload — the set of parameters you pass to the PHLO. You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through parameters when you trigger the PHLO from your application.

In either case, you need your Auth ID and Auth Token, which you can get from the overview page of the Plivo console.

You also need the PHLO ID, which you can copy from the PHLO list page.

With a static payload

When you configure values when creating the PHLO, they act as a static payload.

Code

Create a file called trigger_phlo.py and paste into it this code.

import plivo

auth_id = '<auth_id>'
auth_token = '<auth_token>'
phlo_id = '<phlo_id>'
phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
phlo = phlo_client.phlo.get(phlo_id)
response = phlo.run()
print str(response)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console.

With a dynamic payload

To use dynamic values for the parameters, use Liquid templating parameters when you create the PHLO and pass the values from your code when you trigger it.

Code

Create a file called trigger_phlo.py and paste into it this code.

import plivo

auth_id = '<auth_id>'
auth_token = '<auth_token>'
phlo_id = '<phlo_id>'
payload = {"from" : "<caller_id>","to" : "<destination_number>"}
phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
phlo = phlo_client.phlo.get(phlo_id)
response = phlo.run(**payload)
print str(response)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Test

Save the file and run it.

$ python trigger_phlo.py

Receive your first inbound call

You can create and deploy a PHLO to receive an inbound call with a few clicks on the PHLO canvas, without writing a single line of code.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Play Audio component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Call trigger state to the Play Audio node.

• In the Configuration pane at the right of the canvas, configure the Play Audio node to play a message to the caller.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

Test

You can now make a call to your Plivo phone number and see how the inbound call is handled.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

Forward an inbound call

You can create and deploy a workflow to implement call forwarding with a few clicks on the PHLO canvas.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Call Forward component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node‘s Incoming Call trigger state to the Call Forward node.

• In the Configuration tab at the right of the canvas, configure the Call Forward node to select the From number using a variable. Enter two curly brackets to view all available variables, and choose the appropriate one. Enter all the numbers you want to call in the To field, separated with commas.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign your PHLO to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the phone number, then click Update Number.

Test

You can now call your Plivo phone number and see how the inbound call is forwarded.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

More use cases

We illustrate more than 20 use cases with code for both PHLO and API/XML on our documentation pages.

Using XML

Install Python, Flask, and the Plivo Python SDK

You must set up and install Python, Flask, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install Flask and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mypythonapp
$ cd mypythonapp

Install Flask and the Plivo Python SDK using pip.

$ pip install flask plivo

Alternatively, you can download the source code and run

$ python setup.py install

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Once you’ve set up your development environment, you can start making and receiving calls using our APIs and XML documents. Here are three common use cases to get you started.

Make your first outbound call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use https://s3.amazonaws.com/static.plivo.com/answer.xml as an answer URL to test your first outgoing call. The file contains this XML code:

<Response> 
<Speak>Congratulations! You've made your first outbound call!</Speak> 
</Response>

This code instructs Plivo to say, “Congratulations! You’ve made your first outbound call!” to the call recipient. You can find the entire list of valid Plivo XML verbs in our XML Reference documentation.

Set up a Flask server to handle outbound calls

Create a file called makecall.py and paste into it this code.

import plivo

client = plivo.RestClient('<auth_id>','<auth_token>')
response = client.calls.create(
    from_='<caller_id>',
    to_='<destination_number>',
    answer_url='https://s3.amazonaws.com/static.plivo.com/answer.xml',
    answer_method='GET', )
print(response)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Note: We recommend that you store your credentials in the auth_id and auth_token environment variables to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use os.environ to store environment variables and retrieve them when initializing the client.

Test

Save the file and run your code.

$ python makecall.py

Receive your first inbound call

Plivo requests an answer URL when it answers the call (step 2) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo’s text-to-speech engine plays a message using the Speak XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Set up a Flask server to handle incoming calls

Create a file called receive_call.py and paste into it this code.

from flask import Flask, Response
from plivo import plivoxml

app = Flask(__name__)

@app.route('/receive_call/', methods=['GET','POST'])
def speak_xml():
    # Generate a Speak XML document with the details of the text to play on the call
    response = (plivoxml.ResponseElement()
            .add(plivoxml.SpeakElement('Hello, you just received your first call')))
    return Response(response.to_string(), mimetype='application/xml')

if __name__ == "__main__":
    app.run(host='0.0.0.0', debug=True)

Save the file and run the code.

$ python receive_call.py

You should see your basic server application in action at http://localhost:5000/receive_call/.

Expose your local server to the internet

To receive incoming calls, your local server must connect with Plivo API services. For that, we recommend using ngrok, which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

Run ngrok on the command line, specifying the port that hosts the application on which you want to receive calls (8000 in this case):

./ngrok http 8000

This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

You can check the app in action at https://6ea358b0f703.ngrok.io/receivecall/ and check the XML response.

Create a Plivo application to receive calls

Associate the Flask server you created with Plivo by creating a Plivo application. Visit Voice > Applications and click Add New Application. You can also use Plivo’s Application API.

Give your application a name — we called ours Receive_call. Enter the server URL you want to use (for example https://<yourdomain>.com/receive_call.php/) in the Primary Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Receive_call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone.

Forward an incoming call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo forwards the call using the Dial XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Set up a Flask server to forward calls

Create a file called forward_call.py and paste into it this code.

from flask import Flask, request, make_response, Response
from plivo import plivoxml

app = Flask(__name__)

@app.route('/forward_call/', methods=['GET', 'POST'])
def forwardcall():

    response = plivoxml.ResponseElement()
    response.add(
        plivoxml.DialElement().add(
            plivoxml.NumberElement('<destination_number>')))
    return(response.to_string())

if __name__ == '__main__':
    app.run(host='0.0.0.0', debug=True)

Replace the destination number placeholder with an actual phone number (for example, 12025551234).

Create a Plivo application to forward calls

Associate the Flask server you created with Plivo by creating a Plivo application. Visit Voice > Applications in the Plivo console and click on Add New Application, or use Plivo’s Application API.

Give your application a name — we called ours Forward Call. Enter the server URL you want to use (for example https://<yourdomain>.com/forward_call/) in the Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Forward Call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone. Plivo will send a request to the answer URL you provided requesting an XML response and then forward the call according to the instructions in the XML document the server provides.

More use cases

We illustrate more than 20 use cases with code for both API/XML and PHLO on our documentation pages.

Python & Django

Get Started with Python Using Django Framework

Start by signing up for a free trial account that you can use to experiment with and learn about our services. The free trial account comes with free credits, and you can add more as you go along. You can also add a phone number to your account to start testing the full range of our voice and SMS features. A page in our support portal walks you through the signup process.

You can start making and receiving calls either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

Using PHLO

Set up your Python Django dev environment

You must set up and install Python, Django, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install Django and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mydjangoapp
$ cd mydjangoapp

Install the latest version of the modules using pip.

$ pip3 install django plivo

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Create a Django project

Start a new Django project.

$ django-admin startproject VoiceProj

This command creates a VoiceProj directory in your projects directory.

Once you’ve set up your development environment, you can start making and receiving calls using PHLO, our visual workflow design studio, or using our APIs and XML documents. Here are three common use cases to get you started.

Make your first outbound call

You can create and deploy a PHLO to make an outbound call with a few clicks on the PHLO canvas, and trigger it with some simple code.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note:

  The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Initiate Call component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s API Request trigger state to the Initiate Call node.

• In the Configuration pane at the right of the canvas, configure the Initiate Call node with a caller ID in the From field. Enter the destination number you wish to call in the To field.

  Note: You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through Liquid

  templating parameters when you trigger the PHLO from your application.

• Once you’ve configured the node, click Validate to save the configuration.

• Similarly, create a node from the Play Audio component. Connect the Initiate Call node to the Play Audio node using the Answered trigger state.

• Configure the Play Audio node to play a message to the user by entering text in the Speak Text box in the Prompt section of the Configuration pane — for example, “Hello, you just received your first call.”

• Connect the Initiate Call node’s Answered trigger state to the Play Audio node.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

Your PHLO is now ready to test.

Trigger the PHLO

You integrate a PHLO into your application workflow by making an API request to trigger the PHLO with the required payload — the set of parameters you pass to the PHLO. You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through parameters when you trigger the PHLO from your application.

In either case, you need your Auth ID and Auth Token, which you can get from the overview page of the Plivo console.

You also need the PHLO ID, which you can copy from the PHLO list page.

Change to the project directory and run this command to create a Django application for outbound calls.

$ python manage.py startapp outboundcall

This command creates an outboundcall directory in your VoiceProj directory.

With a static payload

When you configure values when creating the PHLO, they act as a static payload.

Code

Edit outboundcall/views.py and paste into it this code.

from django.conf import settings
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
import plivo

@csrf_exempt
def outboundcall_response(request):

  auth_id = '<auth_id>'
  auth_token = '<auth_token>'
  phlo_id = '<phlo_id>'
  phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
  phlo = phlo_client.phlo.get(phlo_id)
  response = phlo.run()
  return HttpResponse(response)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console.

With a dynamic payload

To use dynamic values for the parameters, use Liquid templating parameters when you create the PHLO and pass the values from your code when you trigger it.

Code

Edit outboundcall/views.py and paste into it this code.

from django.conf import settings
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
import plivo

@csrf_exempt
def outboundcall_response(request):
  auth_id = '<auth_id>'
  auth_token = '<auth_token>'
  phlo_id = '<phlo_id>'
  payload = {"from" : "<caller_id>","to" : "<destination_number>"}
  phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
  phlo = phlo_client.phlo.get(phlo_id)
  response = phlo.run(**payload)
  return HttpResponse(response)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Add a route

Create a file called outboundcall/urls.py and paste into it this code.

from django.conf.urls import url
from . import views
urlpatterns = [
   url(r'^$', views.outboundcall_response, name='outboundcall'),
]

Add a route for the outboundcall app into the urls.py of your VoiceProj project. Edit VoiceProj/urls.py and add this code.

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
   url(r'^outboundcall/', include('outboundcall.urls')),
   url(r'^admin/', admin.site.urls),
   ]

Test

Run your code.

$ python manage.py runserver

Receive your first inbound call

You can create and deploy a PHLO to receive an inbound call with a few clicks on the PHLO canvas, without writing a single line of code.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Play Audio component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Call trigger state to the Play Audio node.

• In the Configuration pane at the right of the canvas, configure the Play Audio node to play a message to the caller.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

Test

You can now make a call to your Plivo phone number and see how the inbound call is handled.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

Forward an inbound call

You can create and deploy a workflow to implement call forwarding with a few clicks on the PHLO canvas.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Call Forward component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node‘s Incoming Call trigger state to the Call Forward node.

• In the Configuration tab at the right of the canvas, configure the Call Forward node to select the From number using a variable. Enter two curly brackets to view all available variables, and choose the appropriate one. Enter all the numbers you want to call in the To field, separated with commas.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign your PHLO to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the phone number, then click Update Number.

Test

You can now call your Plivo phone number and see how the inbound call is forwarded.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

More use cases

We illustrate more than 20 use cases with code for both PHLO and API/XML on our documentation pages.

Using XML

Install Python, Django, and the Plivo Python SDK

You must set up and install Python, Django, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install Django and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mydjangoapps
$ cd mydjangoapps

Install Django and the Plivo Python SDK using pip.

$ pip install django plivo

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Once you’ve set up your development environment, you can start making and receiving calls using our APIs and XML documents. Here are three common use cases to get you started.

Make your first outbound call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use https://s3.amazonaws.com/static.plivo.com/answer.xml as an answer URL to test your first outgoing call. The file contains this XML code:

<Response> 
<Speak>Congratulations! You've made your first outbound call!</Speak> 
</Response>

This code instructs Plivo to say, “Congratulations! You’ve made your first outbound call!” to the call recipient. You can find the entire list of valid Plivo XML verbs in our XML Reference documentation.

Create a Django project

Use django-admin to auto-generate code for a Django project.

$ django-admin startproject VoiceProj

This command creates a VoiceProj directory in your mydjangoapps directory.

Create a Django app for outbound calls

Change to the new directory and create a Django app for outbound calls.

$ python manage.py startapp outboundcall

This command creates an outboundcall directory in your VoiceProj directory.

Edit outboundcall/views.py and paste into it this code.

from django.conf import settings
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
import plivo

@csrf_exempt
def outboundcall_response(request):

   client = plivo.RestClient(settings.<auth_id>, settings.<auth_token>)
   response = client.calls.create(
       from_=settings.<caller_id>,
       to_='<destination_number>',
       answer_url='https://s3.amazonaws.com/static.plivo.com/answer.xml',
       answer_method='GET', )
   return HttpResponse(response)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Note: We recommend that you store your credentials in the auth_id and auth_token environment variables to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use os.environ to store environment variables and retrieve them when initializing the client.

Add a route

Create the file outboundcall/urls.py and paste into it this code.

from django.conf.urls import url
from . import views
urlpatterns = [
   url(r'^$', views.outboundcall_response, name='outboundcall'),
]

Add a route for the outboundcall app into the urls.py of your VoiceProj project. Edit VoiceProj/urls.py and paste into it this code.

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
   url(r'^outboundcall/', include('outboundcall.urls')),
   url(r'^admin/', admin.site.urls),
   ]

Test

Run your code.

$ python manage.py runserver

Receive your first inbound call

Plivo requests an answer URL when it answers the call (step 2) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo’s text-to-speech engine plays a message using the Speak XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create a Django app to handle incoming calls

Change to the VoiceProj directory and create a Django app to handle incoming calls.

$ python manage.py startapp receivecall

This command creates a receivecall directory in the VoiceProj directory. Edit receivecall/views.py and paste into it this code.

from django.conf import settings
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
from plivo import plivoxml

@csrf_exempt
def receivecall_response(request):

   # Generate a Speak XML document with the details of the text to play on the call
   response = (plivoxml.ResponseElement()
           .add(plivoxml.SpeakElement('Hello, you just received your first call')))
   return HttpResponse(response.to_string(), content_type='text/xml')

Add a route

Create the file receivecall/urls.py and paste into it this code.

from django.conf.urls import url
from . import views
urlpatterns = [
   url(r'^$', views.receivecall_response, name='receivecall'),
]

Add a route for the receivecall app into the urls.py of your VoiceProj project. Edit VoiceProj/urls.py and paste into it this code.

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
   url(r'^outboundcall/', include('outboundcall.urls')),
   url(r'^receivecall/', include('receivecall.urls')),
   url(r'^admin/', admin.site.urls),
   ]

Run the code.

$ python3 manage.py runserver

You should see your basic server app in action at http://localhost:8000/receivecall/.

Expose your local server to the internet

To receive incoming calls, your local server must connect with Plivo API services. For that, we recommend using ngrok, which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

Note: Before starting the service, add ngrok in the allowed hosts list in the settings.py file in your project.

ALLOWED_HOSTS = ['.ngrok.io']

Run ngrok on the command line, specifying the port that hosts the application on which you want to receive calls (8000 in this case):

./ngrok http 8000

This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

You can check the app in action at https://6ea358b0f703.ngrok.io/receivecall/ and check the XML response.

Create a Plivo application to receive calls

Associate the Django app you created with Plivo by creating a Plivo application. Visit Voice > Applications and click Add New Application. You can also use Plivo’s Application API.

Give your application a name — we called ours Receive_call. Enter the server URL you want to use (for example https://<yourdomain>.com/receive_call.php/) in the Primary Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Receive_call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone.

Forward an incoming call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo forwards the call using the Dial XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create a Django app to forward calls

Change to the VoiceProj directory and create a Django app to forward incoming calls.

$ python3 manage.py startapp forwardcall

This command creates a forwardcall directory in your VoiceProj directory. Edit forwardcall/views.py and paste into it this code.

from django.conf import settings
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
from plivo import plivoxml

@csrf_exempt
def forwardcall_response(request):

   # Generate a Dial XML forward the incoming call.
   response = plivoxml.ResponseElement()
    response.add(
        plivoxml.DialElement().add(
            plivoxml.NumberElement('<destination_number>')))
   return HttpResponse(response.to_string(), content_type='text/xml')

Replace the destination number placeholder with an actual phone number (for example, 12025551234).

Add a route

Create the file forwardcall/urls.py and paste into it this code.

from django.conf.urls import url
from . import views
urlpatterns = [
   url(r'^$', views.forwardcall_response, name='forwardcall'),
]

Add a route for the forwardcall app into the urls.py of your VoiceProj project. Edit VoiceProj/urls.py and paste into it this code.

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
   url(r'^outboundcall/', include('outboundcall.urls')),
   url(r'^receivecall/', include('receivecall.urls')),
   url(r'^forwardcall/', include('forwardcall.urls')),
   url(r'^admin/', admin.site.urls),
   ]

If you haven’t done so already, expose your local server to the internet.

Create a Plivo application to forward calls

Associate the Django app you created with Plivo by creating a Plivo application. Visit Voice > Applications in the Plivo console and click on Add New Application, or use Plivo’s Application API.

Give your application a name — we called ours Forward Call. Enter the server URL you want to use (for example https://<yourdomain>.com/forward_call/) in the Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Forward Call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone. Plivo will send a request to the answer URL you provided requesting an XML response and then forward the call according to the instructions in the XML document the server provides.

More use cases

We illustrate more than 20 use cases with code for both API/XML and PHLO on our documentation pages.

Python & FastAPI

Get Started with Python Using FastAPI Framework

Start by signing up for a free trial account that you can use to experiment with and learn about our services. The free trial account comes with free credits, and you can add more as you go along. You can also add a phone number to your account to start testing the full range of our voice and SMS features. A page in our support portal walks you through the signup process.

You can start making and receiving calls either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

Using PHLO

Set up your Python FastAPI dev environment

You must set up and install Python, FastAPI, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install FastAPI and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mypythonapp
$ cd mypythonapp

Install the FastAPI framework using pip.

$ pip install fastapi

Install an ASGI server for production. Uvicorn and Hypercorn are two good ones.

$ pip install uvicorn

Install the Plivo Python SDK.

$ pip install plivo

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Make your first outbound call

You can create and deploy a PHLO to make an outbound call with a few clicks on the PHLO canvas, and trigger it with some simple code.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Initiate Call component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s API Request trigger state to the Initiate Call node.

• In the Configuration pane at the right of the canvas, configure the Initiate Call node with a caller ID in the From field. Enter the destination number you wish to call in the To field.

  Note: You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through Liquid

  templating parameters when you trigger the PHLO from your application.

• Once you’ve configured the node, click Validate to save the configuration.

• Similarly, create a node from the Play Audio component. Connect the Initiate Call node to the Play Audio node using the Answered trigger state.

• Configure the Play Audio node to play a message to the user by entering text in the Speak Text box in the Prompt section of the Configuration pane — for example, “Hello, you just received your first call.”

• Connect the Initiate Call node’s Answered trigger state to the Play Audio node.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

Your PHLO is now ready to test.

Trigger the PHLO

You integrate a PHLO into your application workflow by making an API request to trigger the PHLO with the required payload — the set of parameters you pass to the PHLO. You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through parameters when you trigger the PHLO from your application.

In either case, you need your Auth ID and Auth Token, which you can get from the overview page of the Plivo console.

You also need the PHLO ID, which you can copy from the PHLO list page.

With a static payload

When you configure values when creating the PHLO, they act as a static payload.

Code

Create a file called trigger_phlo.py and paste into it this code.

import plivo
from typing import Optional
from fastapi import FastAPI

app = FastAPI()

@app.get("/outbound/")
def make_call():

  auth_id = '<auth_id>'
  auth_token = '<auth_token>'
  phlo_id = '<phlo_id>'
  phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
  phlo = phlo_client.phlo.get(phlo_id)
  response = phlo.run()
  return response

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console.

With a dynamic payload

To use dynamic values for the parameters, use Liquid templating parameters when you create the PHLO and pass the values from your code when you trigger it.

Code

Create a file called trigger_phlo.py and paste into it this code.

import plivo
from typing import Optional
from fastapi import FastAPI

app = FastAPI()

@app.get("/outbound/")
def make_call():
    auth_id = '<auth_id>'
    auth_token = '<auth_token>'
    phlo_id = '<phlo_id>'
    payload = {"from" : "<caller_id>","to" : "<destination_number>"}
    phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
    phlo = phlo_client.phlo.get(phlo_id)
    response = phlo.run(**payload)
    return response

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Test

Save the file and run your code.

$ uvicorn trigger_phlo:app --reload

Receive your first inbound call

You can create and deploy a PHLO to receive an inbound call with a few clicks on the PHLO canvas, without writing a single line of code.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Play Audio component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Call trigger state to the Play Audio node.

• In the Configuration pane at the right of the canvas, configure the Play Audio node to play a message to the caller.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

Test

You can now make a call to your Plivo phone number and see how the inbound call is handled.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

Forward an inbound call

You can create and deploy a workflow to implement call forwarding with a few clicks on the PHLO canvas.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Call Forward component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node‘s Incoming Call trigger state to the Call Forward node.

• In the Configuration tab at the right of the canvas, configure the Call Forward node to select the From number using a variable. Enter two curly brackets to view all available variables, and choose the appropriate one. Enter all the numbers you want to call in the To field, separated with commas.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign your PHLO to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the phone number, then click Update Number.

Test

You can now call your Plivo phone number and see how the inbound call is forwarded.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

More use cases

We illustrate more than 20 use cases with code for both PHLO and API/XML on our documentation pages.

Using XML

Install Python, FastAPI, and the Plivo Python SDK

You must set up and install Python, FastAPI, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install FastAPI and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mypythonapp
$ cd mypythonapp

Install the FastAPI framework using pip.

$ pip install fastapi

Install an ASGI server for production. Uvicorn and Hypercorn are two good ones.

$ pip install uvicorn

Install the Plivo Python SDK.

$ pip install plivo

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Once you’ve set up your development environment, you can start making and receiving calls using our APIs and XML documents. Here are three common use cases to get you started.

Make your first outbound call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use https://s3.amazonaws.com/static.plivo.com/answer.xml as an answer URL to test your first outgoing call. The file contains this XML code:

<Response> 
<Speak>Congratulations! You've made your first outbound call!</Speak> 
</Response>

This code instructs Plivo to say, “Congratulations! You’ve made your first outbound call!” to the call recipient. You can find the entire list of valid Plivo XML verbs in our XML Reference documentation.

Set up a FastAPI server to handle outbound calls

Create a file called main.py and paste into it this code.

import plivo
from typing import Optional
from fastapi import FastAPI, Response
from plivo import plivoxml

app = FastAPI()

@app.get("/outbound/")
def make_call():
    client = plivo.RestClient('<auth_id>','<auth_token>')
    response = client.calls.create(
        from_='<caller_id>',
        to_='<destination_number>',
        answer_url='https://s3.amazonaws.com/static.plivo.com/answer.xml',
        answer_method='GET', )
    return response

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Note: We recommend that you store your credentials in the auth_id and auth_token environment variables to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use os.environ to store environment variables and retrieve them when initializing the client.

Test

Save the file and run your code.

$ uvicorn main:app --reload

Receive your first inbound call

Plivo requests an answer URL when it answers the call (step 2) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo’s text-to-speech engine plays a message using the Speak XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Set up a FastAPI server to handle incoming calls

Edit main.py and paste this code into it after the make_call function block.

import plivo
from typing import Optional
from fastapi import FastAPI, Response
from plivo import plivoxml

app = FastAPI()

@app.get("/outbound/")
def make_call():
    ......
    ......

@app.get("/inbound/")
def receive_call():
    # Generate a Speak XML document with the details of the text to play on the call
    response = (plivoxml.ResponseElement()
                .add(plivoxml.SpeakElement('Hello, you just received your first call')))
    return Response(response.to_string(), media_type="application/xml")

Save the the file and run the code.

$ uvicorn main:app --reload

You should see your basic server application in action at http://localhost:8000/inbound/.

Expose your local server to the internet

To receive incoming calls, your local server must connect with Plivo API services. For that, we recommend using ngrok, which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

Run ngrok on the command line, specifying the port that hosts the application on which you want to receive calls (8000 in this case):

./ngrok http 8000

This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

You can check the application in action at https://dc141ed7fbb9.ngrok.io/inbound/ and check the XML response.

Create a Plivo application to receive calls

Associate the FastAPI application you created with Plivo by creating a Plivo application. Visit Voice > Applications and click Add New Application. You can also use Plivo’s Application API.

Give your application a name — we called ours Receive_call. Enter the server URL you want to use (for example https://<yourdomain>.com/receive_call.php/) in the Primary Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Receive_call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone.

Forward an incoming call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo forwards the call using the Dial XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Set up a FastAPI server to forward calls

Edit main.py and paste this code into it after the receive_call function block.

import plivo
from typing import Optional
from fastapi import FastAPI, Response
from plivo import plivoxml

app = FastAPI()

@app.get("/outbound/")
def make_call():
    .......
    .......


@app.get("/inbound/")
def receive_call():
    .......
    .......

@app.get("/forward/")
def forward_call():
    response = (plivoxml.ResponseElement()
    # Generate a Dial XML document to forward the incoming call
​    response = plivoxml.ResponseElement()
​    response.add(
​        plivoxml.DialElement().add(
​            plivoxml.NumberElement('<destination_number>')))
​    return Response(response.to_string(), media_type="application/xml")

Replace the destination number placeholder with an actual phone number (for example, 12025551234).

If you haven’t done so already, expose your local server to the internet.

Create a Plivo application to forward calls

Associate the Django app you created with Plivo by creating a Plivo application. Visit Voice > Applications in the Plivo console and click on Add New Application, or use Plivo’s Application API.

Give your application a name — we called ours Forward Call. Enter the server URL you want to use (for example https://<yourdomain>.com/forward_call/) in the Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Forward Call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone. Plivo will send a request to the answer URL you provided requesting an XML response and then forward the call according to the instructions in the XML document the server provides.

More use cases

We illustrate more than 20 use cases with code for both API/XML and PHLO on our documentation pages.

Python & Sanic

Get Started with Python Using Sanic Framework

Start by signing up for a free trial account that you can use to experiment with and learn about our services. The free trial account comes with free credits, and you can add more as you go along. You can also add a phone number to your account to start testing the full range of our voice and SMS features. A page in our support portal walks you through the signup process.

You can start making and receiving calls either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

Using PHLO

Set up your Python Sanic dev environment

You must set up and install Python, Sanic, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install Sanic and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mypythonapp
$ cd mypythonapp

Install the latest version of the modules using pip.

$ pip3 install sanic
$ pip3 install plivo

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Make your first outbound call

You can create and deploy a PHLO to make an outbound call with a few clicks on the PHLO canvas, and trigger it with some simple code.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Initiate Call component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s API Request trigger state to the Initiate Call node.

• In the Configuration pane at the right of the canvas, configure the Initiate Call node with a caller ID in the From field. Enter the destination number you wish to call in the To field.

  Note: You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through Liquid

  templating parameters when you trigger the PHLO from your application.

• Once you’ve configured the node, click Validate to save the configuration.

• Similarly, create a node from the Play Audio component. Connect the Initiate Call node to the Play Audio node using the Answered trigger state.

• Configure the Play Audio node to play a message to the user by entering text in the Speak Text box in the Prompt section of the Configuration pane — for example, “Hello, you just received your first call.”

• Connect the Initiate Call node’s Answered trigger state to the Play Audio node.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

Your PHLO is now ready to test.

Trigger the PHLO

You integrate a PHLO into your application workflow by making an API request to trigger the PHLO with the required payload — the set of parameters you pass to the PHLO. You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through parameters when you trigger the PHLO from your application.

In either case, you need your Auth ID and Auth Token, which you can get from the overview page of the Plivo console.

You also need the PHLO ID, which you can copy from the PHLO list page.

With a static payload

When you configure values when creating the PHLO, they act as a static payload.

Code

Create a file called trigger_phlo.py and paste into it this code.

import plivo
from sanic import Sanic
from sanic.response import text

app = Sanic('Plivo Voice App')

@app.route('/outbound', methods=['POST', 'GET'])
async def make_call(request):
  auth_id = '<auth_id>'
  auth_token = '<auth_token>'
  phlo_id = '<phlo_id>'
  phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
  phlo = phlo_client.phlo.get(phlo_id)
  response = phlo.run()
  return text(response, content_type="text/json")

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8000)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console.

With a dynamic payload

To use dynamic values for the parameters, use Liquid templating parameters when you create the PHLO and pass the values from your code when you trigger it.

Code

Create a file called trigger_phlo.py and paste into it this code.

import plivo
from sanic import Sanic
from sanic.response import text

app = Sanic('Plivo Voice App')

@app.route('/outbound', methods=['POST', 'GET'])
async def make_call(request):
    auth_id = '<auth_id>'
    auth_token = '<auth_token>'
    phlo_id = '<phlo_id>'
    payload = {"from" : "<caller_id>","to" : "<destination_number>"}
    phlo_client = plivo.phlo.RestClient(auth_id=auth_id, auth_token=auth_token)
    phlo = phlo_client.phlo.get(phlo_id)
    response = phlo.run(**payload)
    return text(response, content_type="text/json")

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8000)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Test

Save the file and run it.

$ python trigger_phlo.py

Receive your first inbound call

You can create and deploy a PHLO to receive an inbound call with a few clicks on the PHLO canvas, without writing a single line of code.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Play Audio component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Call trigger state to the Play Audio node.

• In the Configuration pane at the right of the canvas, configure the Play Audio node to play a message to the caller.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

Test

You can now make a call to your Plivo phone number and see how the inbound call is handled.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

Forward an inbound call

You can create and deploy a workflow to implement call forwarding with a few clicks on the PHLO canvas.

Prerequisite

To receive incoming calls, you must have a voice-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left side, drag and drop the Call Forward component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node‘s Incoming Call trigger state to the Call Forward node.

• In the Configuration tab at the right of the canvas, configure the Call Forward node to select the From number using a variable. Enter two curly brackets to view all available variables, and choose the appropriate one. Enter all the numbers you want to call in the To field, separated with commas.

• Once you’ve configured the node, click Validate to save the configuration.

• Give the PHLO a name by clicking in the upper left, then click Save.

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign your PHLO to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.
• In the Number Configuration box, select PHLO from the Application Type drop-down.
• From the PHLO Name drop-down, select the PHLO you want to use with the phone number, then click Update Number.

Test

You can now call your Plivo phone number and see how the inbound call is forwarded.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

More use cases

We illustrate more than 20 use cases with code for both PHLO and API/XML on our documentation pages.

Using XML

Install Python, Sanic, and the Plivo Python SDK

You must set up and install Python, Sanic, and Plivo’s Python SDK before you make your first call.

Install Python

Download and install Python from its official site.

Install Sanic and the Plivo Python SDK

Create a projects directory and change into it.

$ mkdir mypythonapp
$ cd mypythonapp

Install the Sanic framework and the Plivo Python SDK using pip.

$ pip install sanic plivo

We recommend that you use virtualenv to manage and segregate your Python environments, instead of using sudo with your commands and overwriting dependencies.

Once you’ve set up your development environment, you can start making and receiving calls using our APIs and XML documents. Here are three common use cases to get you started.

Make your first outbound call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use https://s3.amazonaws.com/static.plivo.com/answer.xml as an answer URL to test your first outgoing call. The file contains this XML code:

<Response> 
<Speak>Congratulations! You've made your first outbound call!</Speak> 
</Response>

This code instructs Plivo to say, “Congratulations! You’ve made your first outbound call!” to the call recipient. You can find the entire list of valid Plivo XML verbs in our XML Reference documentation.

Set up a Sanic server to handle outbound calls

Create a file called main.py and paste into it this code.

import plivo
from plivo import plivoxml
from sanic import Sanic
from sanic.response import text

app = Sanic('Plivo Voice App')

@app.route('/outbound', methods=['POST', 'GET'])
async def make_call(request):
  client = plivo.RestClient('<auth_id>','<auth_token>')
  response = client.calls.create(
      from_='<caller_id>',
      to_='<destination_number>',
      answer_url='https://s3.amazonaws.com/static.plivo.com/answer.xml',
      answer_method='GET', )
  print(response)
  return text(response, content_type="text/json")

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8000)

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, [phone]).

Note: We recommend that you store your credentials in the auth_id and auth_token environment variables to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use os.environ to store environment variables and retrieve them when initializing the client.

Test

Save the file and run your code.

$ python main.py

Receive your first inbound call

Plivo requests an answer URL when it answers the call (step 2) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo’s text-to-speech engine plays a message using the Speak XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Set up a Sanic server to handle incoming calls

Edit main.py and paste this code into it after the make_call function block.

import plivo
from plivo import plivoxml
from sanic import Sanic
from sanic.response import text

app = Sanic('Plivo Voice App')

@app.route('/outbound', methods=['POST', 'GET'])
async def make_call(request):
  .......
  .......


@app.route('/inbound', methods=['POST', 'GET'])
async def receive_call(request):
    # Generate a Speak XML document with the details of the text to play on the call
    response = (plivoxml.ResponseElement()
                .add(plivoxml.SpeakElement('Hello, you just received your first call')))
    return text(response.to_string(), content_type="text/xml")

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8000)

Save the file and run the code.

$ python main.py

You should see your basic server application in action at http://localhost:8000/inbound/.

Expose your local server to the internet

To receive incoming calls, your local server must connect with Plivo API services. For that, we recommend using ngrok, which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

Run ngrok on the command line, specifying the port that hosts the application on which you want to receive calls (8000 in this case):

./ngrok http 8000

This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

You can check the application in action at https://dc141ed7fbb9.ngrok.io/inbound/ and check the XML response.

Create a Plivo application to receive calls

Associate the Sanic application you created with Plivo by creating a Plivo application. Visit Voice > Applications and click Add New Application. You can also use Plivo’s Application API.

Give your application a name — we called ours Receive_call. Enter the server URL you want to use (for example https://<yourdomain>.com/receive_call.php/) in the Primary Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Receive_call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone.

Forward an incoming call

Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. In this example, when an incoming call is received, Plivo forwards the call using the Dial XML element.

You must have a voice-enabled Plivo phone number to receive incoming calls; you can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

Set up a Sanic server to forward calls

Edit main.py and paste this code into it after the receive_call function block.

import plivo
from plivo import plivoxml
from sanic import Sanic
from sanic.response import text

app = Sanic('Plivo Voice App')

@app.route('/outbound', methods=['POST', 'GET'])
async def make_call(request):
  .......
  .......


@app.route('/inbound', methods=['POST', 'GET'])
async def receive_call(request):
  .......
  .......


@app.route('/forward', methods=['POST', 'GET'])
async def forward_call(request):
    response = plivoxml.ResponseElement()
    response.add(
        plivoxml.DialElement().add(
            plivoxml.NumberElement('<destination_number>')))
    return text(response.to_string(), content_type="text/xml")

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8000)

Replace the destination number placeholder with an actual phone number (for example, 12025551234).

If you haven’t done so already, expose your local server to the internet.

Create a Plivo application to forward calls

Associate the Django app you created with Plivo by creating a Plivo application. Visit Voice > Applications in the Plivo console and click on Add New Application, or use Plivo’s Application API.

Give your application a name — we called ours Forward Call. Enter the server URL you want to use (for example https://<yourdomain>.com/forward_call/) in the Answer URL field and set the method to POST. Click Create Application to save your application.

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Forward Call (the name we gave the application).

Click Update Number to save.

Test

Make a call to your Plivo number using any phone. Plivo will send a request to the answer URL you provided requesting an XML response and then forward the call according to the instructions in the XML document the server provides.

More use cases

We illustrate more than 20 use cases with code for both API/XML and PHLO on our documentation pages.