Design, installation, rental of multimedia audio-visual systems. Systems for video conferencing, simultaneous translation systems, video projection systems, video recording systems, setup of video conferencing rooms, setup of conference rooms, setup of classrooms, sale of multimedia interactive whiteboards, sale of projectors, sale of video conferencing equipment, sale of audio systems, rental of projectors, rental of audio systems, rental of video conferencing equipment, rental of simultaneous translation services, rental of hybrid telephone systems.