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.
Mediatrix 4404Plus series products are designed to reduce the cost of communications through the use of IP technology. These devices have ISDN BRI interfaces. Mediatrix 4404Plus gateways are specifically designed for enterprises, enhancing the existing capabilities of digital access to telephony by integrating it with a variety of modern VoIP standards.