Problem
Investigate the videoconferencing equipment and software offerings of a major networking or telecommunication vendor, such as Cisco Systems, Tandberg, Radvision, or Polycom. What related standards are supported in each company's product line? Which vendors and products support high-definition video, and what are the related standards? Describe available infrastructure products, including gatekeepers and multipoint control units (MCUs), and compare their capabilities with routers and switches in data networks.