The KNX connection is established via KNXnetIP tunneling. A KNX IP router or a KNX IP interface is required in the system. It comes with an integrated room temperature controller and temperature sensor. The room temperature sensor/room temperature control is currently only enabled for applications in KNX: display of the video image from the outdoor station. During the conversation, an image of the visitor can be captured and stored in the image memory. When door calls occur in the absence of the resident, three images of the visitor are automatically saved in the image memory. Different ringtones for door and floor calls can be set, with five polyphonic ringtones available for selection.