Unified Communications is a concept that describes the integration of enterprise communication services, Unified Communications Server from Matrix is a tool/portal/hardware providing enterprise communication services such as IM, presence information, voice (including IP telephony), Mobility features, audio, web & video conferencing, fixed-mobile convergence FMC, desktop sharing, data sharing, call control. with non-real-time communication services such as unified_messaging (integrated voicemail, e-mail, SMS, and fax).