I.356 

ITU-T Specifications for Traffic Measurement

I.361 

ITU-T B-ISDN ATM Layer Specification

I.362 

ITU-T B-ISDN ATM Layer (AAL) Functional Description

I.363 

ITU-T B-ISDN ATM Layer (AAL)  Specification

I.432 

ITU-T Recommendation for  B-ISDN User-network Interface

IANA 

Internet Assigned Numbers Authority

IAP 

Internet Access Provider

IAS 

Integrated Access System

IAS 

Integrated Access Server

IC 

Integrated Circuit

ICANN 

Internet Cooperation of Assigned Names and Numbers

ICC 

International Country Code

ICD 

International Code Designator

ICE Protocol 

Information Content Exchange Protocol

ICMP 

Internet Contol Message Protocol

ICR 

Initial Cell Rate

I-CSCF 

Interrogating Call Session Control Function

IESG 

Internet Engineering……………

IETF 

Internet Engineering Task Force

IISP 

Interim Inter Switch Protocol

ILMI 

Interim Local Management Interface

ILSUP 

International ISDN User Part

ILT 

Integrated Line Terminal

IM 

Instant Messaging

IM 

IP Multimedia

IMA 

Inverse Multiplexing over ATM

IMAP 

Internet Mail

IMAP 

Internet Message Access Protocol

IMEI 

International Mobile Equipment Identity

IMGI 

International Mobile Group Identity

IMS 

IP Multimedia Subsystem

IMSI 

Internationale Mobile Subscriber Identity

IMT-2000 

International Mobile Communications 2000

IN 

Intelligent Network

INAP 

Intelligent Network Application Part

INM 

Internet Messaging

INRIA 

Institut National de Recherche Informatique et Automatique

IP 

Intelligent Peripheral

IP 

Internet Protocol

IP MS 

IP Multimedia Subsystem

IPDR 

IP Date Record

IPv4 

Internet Protocol version 4

IPv6 

Internet Protocol version 6

IPX 

Novell Internetwork Packet Exchange

IS 

Intermediate System

ISDN 

Integrated Services Digital Network

ISDN-BRI 

Basic Rate Interface

ISDN-E 

ETSI ISDN

ISO 

International Standardization Organisation

ISP 

Internet Service Provider

ISPBX 

Integrated Services Private Branch Exchange (ISDN PBX)

ISUP 

ISDN User Part; part of the signalling System number 7 dedicated to signalling for ISDN Subscribers

ITU 

International Telecommunication Union

ITU-T 

International Telecommunication Union - Telecommunications

IVR 

Interactive Voice Response

IWF 

Interworking Function

IWU 

Inter Working Unit