This is a method of providing a phone service to people over the Internet. This type of service moves the traditional phone switch off site and allows more than one company to use a particular switch.
Network router transformed, from the device used only for connection between different networks, into a device capable of performing many additional functions. More and more customers of Cisco deploy routers with integrated network services – complex network routers, which transmit voice, video and data, ensure the Internet connection and provide Wi-Fi and other add-ons.