The Microsoft Unified Communications Managed API 2.0 is a managed-code platform that empowers developers to build applications that provide access to and control over Microsoft’s Enhanced Presence information, instant messaging, telephone and video calls and audio/video conferencing. It enables both text based, as well as voice based - speech technology enabled – conversations and collaboration. The UC Managed API 2.0 is intended to support the development of server side, middle-tier applications targeting Microsoft Office Communicator 2007 R2 and Microsoft Office Communications Server 2007 R2. It contains a SIP stack, a media stack as well as powerful speech engines for both automatic speech recognition (ASR) as well as speech synthesis (TTS).