Play an Audio File Into a Voice Call With Go

This tutorial guides you through setting up a server using Go and the Vonage API to receive voice calls, play an audio file into the call, and add a Text-To-Speech message to the call. To follow along with this tutorial, you need a phone number, a Vonage API account, and a virtual phone number purchased from Vonage. You will create a new Go application with a single webhook URL to handle incoming calls, run the server using `http.ListenAndServe(":3000", nil)`, and write code to play an audio file into the active call. To expose your project to the internet, you can use Ngrok to get a public URL for your application and configure it in the Vonage Dashboard. Once set up, you can test your project by calling the virtual number and triggering the event to play the audio file into the call.