In today's applications we need functionalities to make calls and receive calls. You need to meet the below requirements before we start.

• Set up a free Twilio account.

• Node.js 

• A phone to test the project.

First step is to set up a new Node.js Project. In a new directory open a terminal or command prompt and type the following commands.

mkdir nodejs-phone-call
cd nodejs-phone-call

Then install Twilio Node Helper Library with the following command line.

npm install twilio

Your Node.js project needs your Twilio credentials like Account SID and Auth Token. Create a .env file in your project and add these credentials in it. Set TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN as environment variables to store the values. Then buy a Twilio number. You can provide instructions using Twilio markup language TwiML. When someone makes a call to your Twilio number, Twilio looks up the URL associated with your number and sends a request to the URL. Twilio will follow the instructions sent using TwiML. You can host TwiML through Twilio in a TwiML Bin. To create a new TwiML Bin click create new TwiML Bin button. You will be redirected to a new page where you can configure your bin. You should give a name to your bin first then copy and paste the following TwiML into the TwiML field .

<?xml version="1.0" encoding="UTF-8"?>
<Response>
  <Say>Hello, from Node.js!</Say>
</Response>

Then click the create button and copy the URL. To make a phone call, create a new JavaScript file in the Nodejs-phone -call directory which you created at the beginning. Paste the following code in the JavaScript file.

require('dotenv').config();

const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = require('twilio')(accountSid, authToken);

client.calls
  .create({
    from:'<YOUR_TWILIO_PHONE_NUMBER>',
    to:'<YOUR_PHONE_NUMBER>',     
    url: '<YOUR_TWIML_BIN_URL>'
  })
  .then(call => console.log(call.sid));

Update the above code with Twilio Phone number, personal phone number, URL you copied from TwiML bin.

Run the script using the below given command.

node make-call.js