This tutorial demonstrates how to create a custom conference call solution using PHP and Twilio Programmable Voice, allowing team members to connect from anywhere in the world. To build this application, you need to have PHP 5 or above, Composer globally installed, Ngrok installed, and a Twilio account. You will also need to install the Twilio PHP helper library. The tutorial guides you through creating a new project directory, defining your composer.json file to include the Twilio SDK, handling incoming calls via PHP, making your application accessible to the internet using ngrok, and connecting the webhook to a Twilio phone number. With this solution, you can create your own custom conference call line in just ten lines of PHP code.