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.
TELTUB Inc. is a provider of unprecedented phone services to consumers and small businesses. TELTUB phone services can interact, in real-time, with other messaging technologies and platforms.