ng, presence, groups or chat, and shared content. IMS (IP Multimedia Subsystem) A standard that defines a generic architecture that offers VoIP and other multimedia services within wireline and wireless infrastructures. The aim of IMS is to provide all the services, current and future, that the Internet provides. IMS creates a tele- phony-oriented signaling network that overlays an underlying IP network. Using the IP protocol as its foundation, IMS supports data, video, SIP-based VoIP, and non-SIP packetized voice, such as H.323 and MGCP. IMS was designed to integrate with the PSTN and provide traditional tele- phony services such as 800 numbers, caller ID, and local number portability. IMT-2000 (International Mobile Telecommunications 2000) An evolving standard for 3G mobile communications that enables personal mobility and converging mobile and fixed networks. IMUN (International Mobile User Number) A number used to dial a subscriber mobile networks. IN (intelligent network) An architecture for providing advanced services in telecommuni- cations networks. in-band management A system in which management information is communicated across the network. induction coil An apparatus for obtaining intermittent high voltage consisting of a primary coil through which the direct current flows, an interrupter, and a secondary coil with a larger number of turns in which the high voltage is induced. information infrastructure High-speed communications networks capable of carrying voice, data, text, image, and video (multimedia) information in an interactive mode serving an enterprise computing architecture. information path The functional route by which information is routed. information signals Signals associated with activating and delivering various enhanced fea- tures, such as call waiting. information systems network A network of multiple operating-level systems and one management-oriented system (centered around planning, control, and measurement processes). The network retrieves data from databases and synthesizes th