You can use Twilio Programmable Voice to make and receive voice calls in your software application by using the Twilio CLI. To get started, you need a free Twilio account, Node.js installed on your machine, and set up your environment with the Twilio CLI installed. You can buy a Twilio phone number from the CLI and create a TwiML Bin to host your TwiML document. When your Twilio phone number makes a call, Twilio looks up the URL associated with your number and sends a request to that URL. If your URL contains TwiML, Twilio will follow the instructions found in the document. You can use the CLI to make a phone call through your new Twilio phone number by running a specific command, replacing placeholders with your actual phone numbers and the URL of your TwiML Bin.