In addition to cordless phones and products from AVM such as repeaters, radiator controllers, switchable sockets and pushbuttons, 10 smart home devices from other manufacturers can be registered with a Fritz!Box.
If more than 10 belt winders are to be operated together, a second DECT-capable Fritz!Box (e.g. a 7530) can be used in the mesh, to which 10 devices can then be registered again.
Info on the subject can also be found under this link.
Info on the subject can also be found under this link.