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.
DrayTek Vigor2930Vn new series routers have two separate WAN ports for connection to Internet service providers through Ethernet with load balancing on interfaces and redundant communication. This solution is often necessary for connection of any office to two different providers to organize a permanent access to the Internet.