Call Tracking with Java and Servlets

This Java Servlet application demonstrates how to use Twilio to track the effectiveness of different marketing channels by purchasing phone numbers, forwarding incoming calls, and recording statistics. The application consists of three main features: search for available phone numbers, buy a phone number, and display charts showing data about the phone numbers and calls they receive. The backend part of the code creates LeadSources and Twilio Numbers, while the frontend uses JavaScript and Chart.js to visualize statistics.