Unified communications (UC) is the concept describing the integration of communication services such as voice (including VOIP telephony), instant messaging (chat), presence information, mobility features (including extension mobility and single number reach), audio, web & video conferencing, desktop sharing, data sharing, and call control 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 solution that provides a consistent unified user interface and user experience across multiple devices and media types.