This document summarizes opportunities for integrating SMS and VoIP capabilities into Drupal websites. It discusses: 1) Popular SMS and VoIP use cases like direct marketing, event organization, and reducing infrastructure costs. 2) Benefits of integrating these services like accessing existing data, automation, and ability to store data. 3) The current state of Drupal 7 modules for SMS and VoIP integration, and opportunities to build custom modules using the Twilio API. 4) Examples of apps the author has built using a custom Twilio module, including a party planning app and a door buzzer app.