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134 APPENDIX : GLOSSARY
IDE Integrated Drive Electronics—Standard interface to the hard disk drive on the PC.
IEC International Electrotechnical Commission—The international standards body for
electrotechnology.
IIS Internet Information Server—Microsoft Windows NT web based server. It allows
you to create control and manage a web site remotely.
IMT Inter-Machine Trunks—In the SS7 network, the IMT is the channel that carries the
data to the SSP.
ISUP Intergrated Services Digital Network User Part —This is the control function of the
SS7 protocol. It determines the call setup, administration, and call take down on
the SS7 network. In the SS7 system with VoIP enabled, the ISUP commands are
converted to SLAP commands.
I/O Input/Output
IP Internet Protocol—A set of instructions that controls the node addresses, routes
the messages, and so on of the internet.
IP Telephony Manager IP Telephony Manager is a software application developed by CommWorks, a
division of 3Com, that runs on a UNIX management station. This application
remotely manages 3Com Network Application Cards (NACs) and Network
Interface Cards (NICs) through a Network Management Card (NMC) installed on
the CommWorks 5210 IP Telephony Platform.
ISA Industry Standard Architecture—The most common bus architecture on the
motherboard of a MS-DOS based computer.
ISDN Integrated Service Digital Network—A system that provides simultaneous voice
and high-speed data transmission through a single channel to the user. ISDN is an
international standard for end-to-end digital transmission of voice, data, and
signaling.
ITG Internet Telephony Gateway— A bridge between traditional circuit-switched
telephony and the internet that extends the advantages of IP telephony to the
standard telephone by digitizing the standard telephone signal (if it isn't already
digital), significantly compressing it, packetizing it for the internet using Internet
Protocol (IP,) and routing it to a destination over the internet.
ITU International Telecommunications Union—An organization established by the
United Nations, of which almost every nation is a member. Its charter is to define
standards for telegraphic and telephone equipment.
LAN Local Area Network—A short distance data communications network. Usually
found within a building or a campus environment.
LCF Location Confirm—This is a call flow message.
LEC 1. Local Exchange Carrier—The telephone company servicing the local area. 2.
Line Echo Canceler—A module placed on the line to keep the noise and vibration
on the line to a minimum.
LED Light Emitting Diode—Semiconductor device that emits light. Status lights on
hardware devices are typically LEDs.