I have three Gigaset AS28H at home and I wish to buy and install a fourth one 1. is it possible to buy an extra AS28H with its charger and synchronize it with the existing three I have ?
2. If I buy a single Gigaset AS28H, with its charger and connection to the telephone line, is it possible to synchronize it with the existing three I have without it being connected to the phone line ?