=` This summary provides an overview of the article's content. The author explains how to extend FastEndpoints to respond with TwiML using Twilio for messaging and voice webhooks, securing the application by validating incoming requests from Twilio. The tutorial covers setting up a new FastEndpoints project, creating endpoints that accept JSON requests and respond with TwiML, handling SMS and voice calls, configuring webhooks on Twilio Phone Numbers, and securing the application to prevent unauthorized access.