IAHC International Ad Hoc Committee

IAM Initial Address Message

IAS Integrated Access System

IBC Integrated Broadband Communication

IBCN Integrated Broadband Communication Network

ICA Independent Computing Architecture (protocol)

ICC Internal Control Cluster

ICN International Communications Network

ICP Internal Control Procedure

ICRF International Connection Related Function

ICS Internal Control System

ICT Information and Communication Technologies (same as TIC)

IDD International Direct Dialling (GB, Tel.)

IDN Integrated Digital Network

IDN International Directory Network

IF Intermediate Frequency

IIEM Identité Internationale d'Equipement de Station Mobile

IMA Inverse Multiplexing over ATM

IMEI International Mobile Station Equipment Identity (same as IIEM)

IMTS Improved Mobile Telephone Service

IN Intelligent Network

INAF Intelligent Network Access Function

INDB Intelligent Network Data Base

INI Inter-Network Interface

INS Intelligent Network Server

INSM Indicatif National de Station Mobile

INT Institut National des Télécommunications (FR)

INTERNET International Network

INTUG International Telecommunication Users Group

ION Integrated Optical Network

IPX Inter-network Packet Exchange (protocol)

ISC International Switching Center

ISDN Integrated Services Digital Network (same as RNIS)

ISSN International Standard Serial Number

IST Inter Switch Trunks

ISUP Integrated Services User Part (same as SSUR)

IT Information Technology (same as TI)

ITA Installation Terminale d'Abonné

ITAM Identification Temporaire de l'Abonné Mobile

ITM Intelligent Traffic Management

ITN International Transit Node (same NTI)

ITU International Telecommunication Union