It is a call which is made over internet protocol (VoIP). For example,
one can call using Google Voice to other recipient located miles away. Such
call can also be international.
Integration of real time products, such as chat, telephony (including IP telephony), video conferences, call control and speech recognition, together with “un-real” time products such as voice mail, SMS messages and Fax. “Unified Communications” is not a standalone product, but a set of products, which present a constant user’s interface among many devices and media types.