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.
Grandstream has introduced us with a new device model. This new handset, according to characteristics, can rival Gigaset and Panasonic. The main advantage of this device is 4 simultaneous calls to one base, allowing a registration of up to 5 handsets.