Question about Gigaset CL660 Duo (CH-Version)

You cannot connect the Gigaset base station directly to the Sunrise Connect Box 3 with an RJ45 plug, as the Gigaset base station is normally connected to the phones via DECT. The DECT phones connect wirelessly to the Gigaset base station, not via Wi-Fi. If you want to connect the Gigaset base station to the router to use VoIP functions, you need to make sure that the base station supports VoIP and is compatible with the router. In this case, the Gigaset Box 100 could be a suitable option to establish the connection, as it can be connected directly to the Connect Box 3.