Spring Boot - Make a Voice Call Using Twilio

In this blog, we will use the Twilio API to make a voice call using our Spring Boot application.

Create a Spring Boot Application

  1. Go to https://start.spring.io/

  1. We will go for a maven project for this article.

  2. Generate the project and a zip file will download.

  3. Unzip the project and open the project in any IDE of your preference ( IntelliJ, VSCode, Eclipse )

Add Twilio Dependency to the pom.xml file


Create a Twilio Account

After signing up you will get an

  • Account SID

  • Auth Token

  • Twilio Phone Number

Create a Configuration file for Twilio

  • Add a Config.java files


import com.twilio.Twilio;
import org.springframework.context.annotation.Configuration;

public class Config
    public final static String VC_ACCOUNT_SID = "Your Twilio SID";
    public final static String VC_AUTH_ID = "Your Twilio Auth Token";
    public final static String VC_FROM_NUMBER ="Your Twilio Phone Number";
    public final static String VC_TO_NUMBER =
                "The number you want to make a call to";

    static {
        Twilio.init(VC_ACCOUNT_SID, VC_AUTH_ID);

Note 1:

Make sure you add the country code in VC_TO_NUMBER. For example, if the country code is +91, then VC_TO_NUMBER should be "+91XXXXXXXXXX"

Note 2:

Make sure you add the "@ Configuration" annotation

Implement ApplicationRunner interface

  • We will implement ApplicationRunner interface so that the call is made as soon as we run the application.

  • Add a MyAppRunner.java class


import com.twilio.rest.api.v2010.account.Call;
import com.twilio.type.PhoneNumber;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

import java.net.URI;

public class MyAppRunner implements ApplicationRunner {
    public void run(ApplicationArguments args) throws Exception {
                new PhoneNumber(Config.VC_TO_NUMBER), 
                new PhoneNumber(Config.VC_FROM_NUMBER),
                new URI("http://demo.twilio.com/docs/voice.xml")).create();

Run the application

  • Now run the application and if there are no errors, then you will see a voice call on the mobile number you used in the code.

I hope you found the article useful.

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Happy Coding :)