With the Gigaset Box 100, you can create your own telephone system tailored to your preferences. Up to six HX handsets can be registered to the box and placed freely throughout your home. This is an ideal solution for families living under one roof, for those working from home, or simply for larger spaces. Two calls can be made simultaneously: one external and one internal call between two handsets. Internal calls are free of charge. The internal handset name can be customized according to the person or room.