A system includes a network interface for sending and receiving at least video data between two or more endpoints, where each endpoint includes a display screen. A camera may be located at more than one endpoint capturing video data. The system also includes a control unit for controlling spatial arrangement of one or more video data streams displayed on a display screen of one or more endpoints. The control unit determines a state and configuration of a videoconference and accesses a route description corresponding to the state and configuration of the videoconference. The route description includes a video data stream destination, one or more video data stream sources, and layout information determining the spatial arrangement of one or more video data streams displayed on the video data stream destination.