Businesses in the communication equipment category supply equipment used to transmit voice, video and data between people, teams and organisations. Products may include business telephone systems, desk phones, headsets, two-way radios, radio base stations, intercoms, pagers, video-conferencing equipment and public address systems. Some suppliers also provide routers, switches, antennas, cabling and other components needed to connect communication devices. Services can include assessing requirements, recommending compatible equipment, configuring systems and installing or integrating them with existing networks. Businesses may also provide repairs, fault diagnosis, replacement parts, software updates, user training and ongoing maintenance. The range varies: some focus on supplying individual devices, while others design and support complete communication systems for offices, industrial sites, public services or other settings.