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.
Polycom HDX4500 is a universal personal telepresence system that allows you use the latest UltimateHD technology in your existing environment of unified communications. The HDX 4500 system is made in a new form-factor, equipped with 24-inch display, 1080p camera and powerful speakers; it easy transforms any desktop computer into a multimedia communications center.