\\ More than 3500 Telecom abbreviations maintained by Ioan (Nini) Indreias // 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y All words I&R Installation and Repair I/O Input and Output IA5 International Alphabet #5 (ITU-T) IAA Initial Address Acknowledgement IAB Internet Advisory Board IAB Internet Architecture Board (formerly Activities) IAC Initial Alignment Control IAC International Access Code IAC Internet Access Controler IACS Integrated Access and Crossconnect System IAD Integrated Access Device IAM Initial Address Message IAM Initial Address Message (SS7) IANA Internet Address Naming Authority IAR Initial Address Reject IAT Integrated Access Terminal IBC In-Band Control IBDN Integrated Building Distrubution Network IBO Input Back Off IC-POT Interexchange Carrier-Point of Termination IC Independent Company IC Installation Center IC Integrated Circuit IC Interexchange Carrier ICANN Internet Corporation for Assigned Names and Numbers ICB Individual Case Basis ICC Interface Controller Card ICCB Internet Control and Configuration Board ICCF Industry Carriers Compatibility Forum ICCF Interexchange Carrier Compatibility Forum ICCID Integrated Circuit Card ID (GSM - UMTS) ICD International Code Designator ICI Inter-Carrier Interface (SMDS) ICI Interexchange Carrier Interface (Bellcore) ICID Interexchange Carrier ID ICID Internet Caller IDentification service ICIP Inter-Carrier Interface Protocol ICL Inserted Connection Loss ICLID Incoming Caller Line IDentification ICM Intelligent Call Management ICMP Internet Control Message Protocol ICMP Internet Control Message Protocol (IETF) ICOT Inner City and Outstate Trunk ICP Intelligent Call Processing ICP Internet Control Protocol ICR Intelligent Call Router ICRL Indirect Certificate Revocation List (X.509) ICSC Interexchange Carrier Service Center ICSWE Interexchange Carrier Serving Wire Center ICU ISA Configuration Utility IDB Interface Description Block IDC Internet Data Center IDCP Internet Device Control Protocol IDCT Inverse Discrete Cosine Transform (DCT) IDE Integrated Device Electronics IDE Intelligent Drive Electronics IDEA International Data Encryption Algorithm IDEC Integrated Dynamic Echo Canceller (PictureTel) IDF Intermediate Distributing Frame IDF Intermediate Distributing/Distribution Frame IDI Initial Domain Identifier (ISO) IDLC Integrated Digital Loop Carrier IDN Integrated Digital Network IDN International Data Number (X.121) IDNX Integrated Digital Network Exchange IDP Initial Detection Point (GSM - UMTS) IDP Initial Domain Part IDP Internet Datagram Protocol IDPR Interdomain Policy Routing IDR Internet Detail Record IDS Information Display System (BISYNC) IDS Intrusion Detection System IDT Information Distribution Company IDT Integrated Digital Terminal IDU Interface Data Unit IE Information Element (ISDN/B-ISDN DSS) IEA International Ergonomics Association IEC InterExchange Carrier IEC International Electrotechnical Commission IEEE Institute of Electrical & Electronics Engineers IEEE Institute of Electrical and Electronics Engineers IESG Internet Engineering Steering Group IETF Internet Engineering Task Force IF Intermediate Frequency IFA IP Floating Address IFC Installed First Cost IFR Item for Resolution IFRB International Frequency Registration Board IG Interface Group IGES Initial Graphics Exchange Specification IGMP Internet Group Management Protocol IGOSS Industry/Government Open Systems Specification IGP Interior Gateway Protocol (IETF) IGRP Interior Gateway Routing Protocol (Cisco) IHL Internet Header Length (IP) IIHSO Intercompany Interconnection Held Service Order IIME Intra-network, Inter-SSS Mapping Entity IIS Internet Information Server IISO Intercompany Interconnection Service Order IIT Interactive Information Technology IKE Internet Key Exchange ILD Injection Laser Diode ILEC Incumbent Local Exchange Carrier ILEC Independent Local Exchange Carrier ILMI Interim Local Management Interface ILP IntraLATA Presubscription IM Instant Messaging IM Intensity Modulation IMA International Multimedia Association IMA Inverse Multiplexing over ATM IMAP4 IMAP version 4 IMAP4 Internet Message Access Protocol 4 IMAP Internet Messaging Access Protocol IMD Integrated Management Display IMDB In-Memory Data Base IMEI International Mobile Equipment Identity (GSM - UMTS) IMG Industry Markets Group IML Incoming Matching Loss IML Integrated Management Log IML Integrated Management Log (HP) IMP Interface Message Processor(s) IMS Interactive Multimedia Server IMS Interface Management System IMSI International Mobile Subscriber Identity (GSM - UMTS) IMT Inter-Machine Trunk IMTC International Multimedia Teleconferencing Consortium IMTS Improved Mobile Telephone Service IMUX Intelligent Multiplexer IMUX Inverse Multiplexer IN Ingress Node IN Intelligent Network (AIN) IN Interface Network INA Information Network Architecture INA Interactive Network Adapter INAP Intelligent Network Application Part/Protocol (SS7) INB Install Busy INC Industry Numbering Committee INCRP Intelligent Network Call Routing Protocol INE Intelligent Network Element INL Internodal Link INMARSAT INternational MARitime Satellite Service INP Interim Number Portability INP Internet Nodal Processor INPA Interchangeable Numbering Plan Area INPG Industry Number Plan Guide INR Information Request Message INS Information Network System INWATS INward Wide Area Telephone Service IO Inter-Office IOC Inter-Office Channel IOCC I/O Channel Controller IOP Input/Output Processor IOS Internet Operating System (Cisco) IP Information Provider IP Intelligent Peripheral (AIN) IP Internet Protocol (IETF) IPABX ISDN PABX IPAC ISDN PC Adapter Circuit IPAT ISDN Primary Access Transceiver IPC Inter Process Communication IPCP IP Control Protocol IPI Intelligent Peripheral Interface IPL Initial Program Load IPM Interpersonal Messaging System IPPI IP Plug-in IPR Intellectual Property Rights IPS Instructions Per Second IPSec IP Security IPSO IP Security Option IPSS Inter-Processor Signaling System IPX Internetwork Packet Exchange (NetWare) IPXCP IPX Control Protocol IPXWAN IPX Wide-Area Network IR Infra-Red IR Ingress Router IR Instruction Register IR Intermediate Reach IR Internet Registry IRB Integrated Routing and Bridging IRD Implementation Rate Design IRD Integrated Receiver Decoder IrDA Infra red Data Association IRDP ICMP Router Discovery Protocol IRDS Information Resource Dictionary System IRM Inherited Rights Mask IRN Intermediate Routing Node IRP Individual Routing Processor IRPC ISDN Remote Power Control IRQ Information Request (RAS) IRQ Interrupt ReQuest IRR Information Request Response (RAS) IRSG Internet Research Steering Group IRTF Internet Research Task Force IS-IS Intermediate System-Intermediate System (ISO) IS41 Interim Standard 41 IS In-Service IS Information Systems IS Interim Standard (ISO) IS Intermediate System (ISO) ISA Industry Standard Architecture ISAC ISDN Subscriber Access Controller ISAKMP Internet Security Association and Key Management Protocol ISAM Index Sequential Access Method ISC Industry Service Center ISCP Integrated Service Control Point ISDN Integrated Services Digital Network ISDNUP Integrated Services Digital Network User Part ISDNUP ISDN User Part ISI USC Information Sciences Institute ISID Idle Signal Identification ISL Inter-Switch Link (Cisco) ISLAN Integrated Services LAN (IEEE 802.9) ISLU ISDN Line Unit (AT&T 5ESS) ISM Industrial, Scientific, Medical ISM Internetwork Status Monitor ISN Information Systems Network ISO International Organization for Standardization ISO International Standards Organization ISP Intermediate Service Part ISP Internet/Information Service Provider ISPC International Signaling Point Code ISR Interconnection Service Request ISR Intermediate Session Routing ISSI Inter-Switching System Interface (SMDS) ISSIP Inter-Switching System Interface Protocol ISSN Integrated Special Services Network ISU Iridium Subscriber Unit ISUP ISDN Services User Part ISUP ISDN User Part (SS7) ISV Independent Software Vendor IT Information Technology IT Information Type ITA Interactive TV Appliances ITAC-T International Telecommunications Advisory Committee-Telecommunications ITAC ISDN Terminal Adaptor Circuit ITB Intermediate Text Block (BISYNC) ITC Independent telephony company ITCM Integrated Telephony Cable Modem ITFS Instructional Television Fixed Services ITG Interswitch Trunk Group ITGS Intelligent Traffic Guidance Systems ITN Independent Telecommunication Network ITSP Internet Telephony Service Provider ITU-D ITU-Telecommunication Development Sector (formerly BDT) ITU-R ITU-Radio Communication Sector (formerly CCIR and IFRB) ITU-T ITU-Telecommunication Standardization Sector (formerly CCITT) ITU International Telecommunication(s) Union ITU International Telecommunications Union ITV Interactive TeleVision IUM Internet Usage Manager IV Initialization Value IV Interactive Video IVD Internal Vapor Deposition IVDM Integrated Voice Data Multiplexer IVDS Interactive Video and Data Services (ITA) IVR Interactive Voice Responder IVS Interactive Video Services IVS Interactive Video System IVTTA Intelligent Vehicle and Transportation Technical Area IW Inside Wire IWF Inter-Working Function IWF Interworking Connection IWU Inter-Working Unit (B-ISDN) IWX Interworking Function IX IntereXchange IXC Inter-Exchange Carrier IXC IntereXchange Carrier IXVG IntereXchange Voice Grade channel SMBZ - SaMBoZaur - test for propagation of define: