Unified Communications (UC) describes the integration of real-time, enterprise, communication services such as instant messaging (chat), presence information, voice (including IP telephony), mobility features (including extension mobility and single number reach), audio, web & video conferencing, fixed-mobile convergence (FMC), desktop sharing, data sharing (including web connected electronic interactive whiteboards), call control and speech recognition … with non-real-time communication services such as unified messaging (integrated voicemail, e-mail, SMS and fax).

UC is not necessarily a single product, but a set of products that provides a consistent unified user-interface and user-experience across multiple devices and media-types.