This document describes Teleku, a service that allows web developers to build phone applications using simple APIs. Teleku provides an open source telephony stack running on Amazon EC2 that supports voice, text, and SIP. It also offers speech recognition, text-to-speech in multiple languages, and phone numbers that scale easily. Developers can use PhoneML, a simple XML/JSON-based language, or integrate with Twilio. The service aims to empower developers while addressing enterprises' security and privacy concerns regarding cloud computing.