I

	Internet Gateway
	A gateway for accessing the Internet, which is loosely defined as the complex of wide area networks (WANs) joining government, university, corporate and private computers (nodes) in a vast web of network interconnection.
	IP
	Internet Protocol.
	IP Address
	An address that uniquely identifies each host on a network or Internet. An IP address has a length of 32 bits, and is divided into four 8-bit parts, each separated by a period, as in 149.122.3.30. This kind of notation is called dotted decimal notation. Each part can consist of a number between 1 and 255. In addition to an IP address, you can use a symbolic (domain) name provided by Domain Name Services (DNS) to designate an Internet address.
	ISDN (Integrated Services Digital Network)
	An international standard for end-to-end digital transmission of voice, data, and signalling. In a videoconference it is a system that provides simultaneous voice, video, and text transmission between individual desktop videoconferencing systems and group (room) videoconferencing systems.