Unified communications (UC) is the integration of real-time communication services such as instant messaging (chat), presence information, VoIP, video conferencing, data sharing, call control and speech recognition with non-real-time communication services such as unified messaging (integrated Voicemail, Email, SMS and Fax).

UC is not a single product; it is a set of products that provide a consistent unified user interface and experience across multiple devices and media types.

UC Allows an individual to send a message on one medium and receive the same communication on another medium. For example, one can receive a voicemail message and choose to access it through e-mail or a cell phone. If the sender is online according to the presence information and currently accepts calls, the response can be sent immediately through text chat or video call. Otherwise, it may be sent as a non-real-time message that can be accessed through a cariety of media. 

ITD has traditionally offered components of unified messaging with Fax, Voice Mail, and Instant Messaging services that integrate with Email. Going forward, the integration of Voice and Video services will significantly enhance unified communications and transform business processes.