It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
D-Link introduced a Wi-Fi phone, designed in the shell that combines the ability to connect to a wireless network and to use the benefits of IP-telephony in one portable device. Thanks to this Wi-Fi VoIP-phone home and business users get a significant reduction in expenditures for local and long distance calls comparing to standard phone service.