It is the business practice of sending all clients' billing info to a separate company, who then does everything for you. It also allows a company to cut down on time and human resources spent on administrative tasks.
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.