Browse here for the Telecom Definitions - - Updated till date

3GPP - Third Generation Partnership Project

100BaseT - 100 Megabit per sec Ethernet

10BaseT - 10 Megabit per sec Ethernet

3GPP - Third Generation Partnership Project

AAA - Authentication, Authorization, Accounting

ABR - Area Border Router

ACM - Access Control Manager

ACO - Alarm Cut Off

ACP - Access Control Protocol

ADC - Accounting Data Collection

ADPCM - Adaptive Differential Pulse Code Modulation

ADSL - Asynchronous Digital Subscriber Line

AGC - Access Gateway Controller

AGW - Access Gateway

AH - Authentication Header

AIN - Advanced Intelligent Network

ALOC - Average Length Of Call

ALR - Application Location Register

AMA - Automatic Message Accounting

ANSI - American National Standards Institute

API - Application Program Interface

APS - Automatic Protection Switching

ARP - Address Resolution Protocol

AS - Application Server

ASBR - Autonomous System Boundary Router

ASCII - American Standard Code for Information Interchange

ASIC - Application Specific Integrated Circuit

ATM - Asynchronous Transfer Mode

BA - Basic Access

BCL - Barring CLass

BDH - Bulk Data Handling

BERT - Bit Error Rate Testing

BFD - Bi-directional Forwarding Detection

BGP - Border Gateway Protocol

BHCA - Busy Hour Call Attempts

BICC - Bearer Independent Call Control

BIDH - Binary Interface Device Handler

BITS - Building Integrated Timing Source

BL - Black List

BOAM - Basic Operation & Administration Management

BOOTP - Bootstrap Protocol

BRAS - Broadband Remote Access Server

BRI - Basic Rate Interface

BSC - Base Station Controller

BSD - Berkeley Software Distribution

BTS - Base Transceiver Station

CA - Call Agent

CAGW - Centralised Access Gateway

CAPEX - CAPital Expenditure

CAS - Channel Associated Signaling

CC - Content of Communication

CCB - Customer Care & BillingC

CBS - Customer Care & Billing System

CCF - Call Control Function

CCP - Call Control Platform

CCR - Call Completion Ratio

CCS - Customer and Care System

CCS#7 - Common Channel Signalling #7

CDB - Circular Database

CDBM - Configuration Database Manager

CDR - Call Detail Record

CDRE - Call Detail Record Generator Element

CE - Control Element

CELP - Code Excited Linear Prediction Compression

CF - Call Forwarding

CFA - Call Failure Announcement

CFB - Call Forwarding on Busy

CFNR - Call Forwarding on No Reply

CFU - Call Forwarding Unconditional

CGI - Common Gateway Interface

CHAP - Challenge Handshake Authentication Protocol

CHT - Call Hold Time

CIC - Channel Identification Code

CIM - Circuit Interface Module

CISE - Command Interface Service Element

CLEC - Competitive Local Exchange Carrier

CLI - Command Line Interface

CLID - Calling Line Identification identity

CLIP - Calling Line Identification Presentation

CLIR - Calling Line Identification Restriction

CMC - Convergent (Network) Management Centre

CMIP - Common Management Information Protocol

CMIS - Common Management Information Service (X.710 IS 9595)

CMISE - Common Management Information Service Element

CNG - Comfort Noise Generator

CO - Central Office

CODEC - Coder-DECoder

COPS - Common Open Policy Service protocol

CORBA - Common Object Request Broker Architecture

CoS - Class of Service

CP - Coordination Processor

CPC - Carrier Portability Codec

PCI - Compact Peripheral Component Interface

CPE - Customer Premises Equipment

CPN - Calling Party Number

CPU - Central Processing Unit

CRV - Call Reference Value

CS-ACELP - Conjugate Structure Algebraic Code Excited Linear Prediction

CSC - Call Session Controller

CSCF - Call Session Control Function

CSM - Call State Machine

CSPF - Constrained Shortest Path First

CSS - Call Screening Server

CSV - Comma Separated Value file

CTB - Call Type BlockingcT

CA - Compact Telecom Computing Architecture

CTI - Computer Telephony Integration

CTM - Cordless Terminal Mobility

CTX - CentrexD161 - Digital Link Interface Card providing 16 E1 or DS1 links

DB- DataBase

DC - Direct Current

DCE - Distributed Computing Environment (OSF)

DCME - Digital Circuit Multiplication Equipment

DCN - Data Communication Network

DDCMP - Digital Data Communication Protocol

DES - Data Encryption Standard

DHCP - Dynamic Host Configuration Protocol

DiffServ - Differentiated Services

DLU - Digital Line Unit

DN - Directory Number or Dialed Number

DNIS - Dialled Number Information Service

DNS - Domain Name Server

DONUT - DOmain and NUmber Translation

DOPRA - Distributed Object-Oriented Programmable Real-time Architecture

DoS - Denial of Service

DPC - Destination Point Code

DQDB - Distributed Queue Dual Bus

DS0 - Digital Signal level 0DS1 - North American PDH carrier level 1 carries 24 DS0 or 1.544 Mbps

DS1 - 1544 kbitpers interface rate (US)

DS3 - North American PDH carrier level 3 carries 28 DS1 (672 DS0) or 45 Mbps

DSCP - DiffServ Code Point

DSI - Digital Speech Interpolation

DSL - Digital Subscriber Line

DSLAM - Digital Subscriber Line Access Module

DSM - Distributed System Management

DSP - Digial Signal Processing

DSS1 - Digital Subscriber Signalling System No.1

DTMF - Dual Tone Multi Frequency

DTX - Discontinuous Transmission

DXM - Digital eXchange Module

E1 - European PDH carrier level 1 carries 32 DS0 or 1.084 Mbps

EC - Events Collector

ECB - End Customer Billing

EFD - Event Forwarding Discriminator (X.721 IS 10165-2)

EH - Event Handling

ELM - Ethernet Link Maintenance

ELM - Event Log Management

EM - Element manager

EMC - Electro Magnetic Compatibility

EMI - Electro Magnetic Interface

EMS - Element Management System

EO - End Office

EP - EndPoint (terminal or GW)

EPS - External Policy Server

EPS - Equipment Protection Switching

EPX - Extended Proxy (SIP)

ERLE - Echo Return Loss Enhancement

ESP - Encapsulation Payload

ESWT - Ethernet Switch

ETL - Echo Tail Length

ETSI - European Telecommunications Standards Institute

EXP - Experimental

FDM - Frequency Division Multiplex

FE - Fast Ethernet

FMM - File Maintenance Manager tool

FMP - File Maintenance Procedure

FoIP - Fax over IP

FPC - Flexible PIC concentrator

FTAM - File Transfer Access and Management

FTAM - Fault Tolerant Application Manager

FTP - File Transfer Protocol

GFI - Generic Forwading Interface

GK - GateKeeper

GOS - Grade Of Service

GTT - Global Title Translation

GUI - Graphical User Interface

GW - GateWay

H.248 - Protocol between MGC and MGW

HA - High Availability

HDLC - High Data Level Control

HTML - HyperText Markup Language

HTTP - Hyper Text Transfer Protocol

HTTPS - Hyper Text Transfer Protocol Secure sockets

HW - Hardware

IACHASTA - Inter Administration Charging And STAtistics

IAD - Integrated Access Device

ICB - Inter Carrier Billing

ICID - IMS Charging Identifier

ICMP - Internet Control Message Protocol

IDB - Interactive Document Browser

IEEE - Institute of Electrical and Electronics Engineers

IETF - Internet Engineering Task Force

IGP - Interior Gateway Protocol

IIS - Internet Information Service

IKE - Internet Key Exchange

ILEC - Incumbent Local Exchange Carrier

IMS - IP Multimedia Subsystem

IN - Intelligent Network

INAP - Intelligent Network Application Part

INOPSI - Intelligent Network Open Policy Server Interface

IOA - Input Output Adaptor

IP - Internet Protocol

IP Trunking - SURPASS network solution IP Trunking

IPM - Integrated Protection Module

IPN - IP Network

IPSec - Secure Internet Protocol

IRI - Intercept Related Information

ISDN - Integrated Services Digital Network

ISL - Integrated Service Logic

ISO - International Standardization Organization

ISP - Internet Service Provider

ISUP - ISDN Signaling User Part

ITCE - Information Technology Control Element

ITSP - Internet Telephony Service Provider

ITU - International Telecommunication Union

ITU-T - International Telecommunications Union - Telecommunications Standardization Sector (formerly know as CCITT)

IUA - ISDN Q.921 User Adaptation Layer

IVR - Interactive Voice Response Syetems

JSP - Java Server Page

L2SW - Layer-2 (LAN) Switch

LAN - Local Area Network

LCR - Least Cost Routing

LDAP - Lightweight Directory Access Protocol

LD-CELP - Low-Delay Code Excited Linear Prediction

LE - Local Exchange

LEA - Law Enforcement Agency

LEC - Local Exchange Carrier

LED - Light Emitting Diode

LEX - Local EXchange

LI - Lawful Interception

LIC - Line Interface Card

LNP - Local Number Portability

LSA - Link State Advertisement

LSP - Label Switched Path

M2PA - MTP Level 2 User Peer-to-Peer Adaptation Layer

M2UA - MTP Level 2 User Adaptation Layer

M3UA - MTP Level 3 User Adaptation Layer

MAC - Medium Access Control

MAC - Machine Address Code

Mb - Megabit

MB - Megabytes

MCM - Media Conversion Module

MCP - Media Control Platform

MCT - Media Control Task

MCU - Multipoint Control Unit

MD5 - Message Digest 5

MEGACO - Gateway Control Protocol (ITU-T H.248)

MF - Multi Frequency

MG - Media Gateway

MGAM - Media Gateway Alarm Manager

MGC - Media Gateway Controller

MGCP - Media Gateway Control Protocol (between MGC and MG)

MGEM - Media Gateway Element Manager

MGW - Media Gateway

MIB - Management Information Base

MIM - Media Interface Module

MIMO - Multiple Input Multiple Output ==> This technology exploits a radio-wave phenomenon called multipath, where transmitted information bounces off walls, doors, and other objects, reaching the receiving antenna multiple times via different routes and at slightly different times.

MLPP - Multi-Link Point-to-Point Protocol

MM - MultiMedia

MMAS - MultiMedia Application Server

MMCS - MultiMedia Call Server

MML - Man Machine Language

MMphoneR - MultiMedia phone Residential

MOS - Mean Opinion Score

MP - Main Processor

MPLS - Multi Protocol Label Switching

MRF - Media Resource Function or MediaServer

MS - Media Server

MSC - Mobile Switching Center

MSF - Multiservice Switching Forum

MSP - Multiplex Section Protection

MTA - Message Transfer Agent

MTBF - Mean Time Between Failures

MTP - Message Transfer Part

MTTR - Mean Time To Repair

NAPT - Network Address and Port Translation

NAS - Network Access Server

NAT - Network Address Translation

NCS - Network based Call Signaling

NE - Network Element

NEBS - Network Equipment Building System

NetM - Net Manager

NFAS - Non-Facility Associated Signaling

NGN - Next Generation Networks

NGS - Next Generation Switch

NMC - Network Management Center

NML - Network Management Layer

NMS - Network Management System

NNI - Network to Network Interface

NOA - Nature Of Address

NPA - Numbering Plan Area

NPV - Net Present Value

NSSA - Not-to-Stub-Area

NTP - Network Time Protocol

NUC - Nailed-UP Connection

NUT - Number Translation

NVI - New Voice Infrastructure

OA&M - Operation Administration & Maintenance

OAM&P - Operation, Administration Maintenance & Performance

OC3 - Synchronous Optical Network Level 3 (155 Mbps) for use in North America

OCI - Oracle Call Interface

OCS - Open Consumer Suite

OD - Optical Disc

ODBC - Open DataBase Connectivity

ODP - Outgoing Digit Preparation

OLC - Open Logical Channel

OLT - Optical Line Terminal

OMAP - Operation, Maintenance and Administration Part

ONU - Optical Network Unit

OPEN - Open Path to Enhanced Networking

OPEX - OPerating EXpenses

OPSAPI - Open Policy Server API

OPSI - Open Policy Server Interface

ORJ - Operator Requested Job

OS - Operating System

OSA - Open Service Access

OSP - Open Settlement Protocol

OSPF - Open Shortest Path First

OSS - Operation Support Systems

OTAF - On the Air Function

OWP - Operator Work Place

PAP - Password Authentication Protocol

PBN - Packet Based Network

PBX - Private Branch eXchange

PC - Personal Computer

PCI - Peripheral Component Interconnect

PCM - Pulse Code Modulation

PCU - Packet Control Unit

PDC - Performance Data Collector

PDH - Plesiochronous Digital HierarchyP

DN - Packet Data Netowrk

PEFD - Lower Feed Entry card

PEFU - Upper Feed Entry card

PIC - Physical Interface Card

PIF - Port Interface

PIM - Personal Information Manager

PIM - Packet Interface Module

PLC - Packet Loss Concealment

PLMN - Public Land Mobile Network

PLP - Packet Loss Priority

PM - Packet Manager

PNP - Private Numbering Plan

PoC - Push to talk over Cellular

POI - Point Of Interconnection

PoP - Point of Presense

POTS - Plain Old Telephone System

PPP - Point to Point Protocol

PRA - Primary Rate Access

PRI - Primary Rate Interface

PSAP - Public Safety Answering Points

PSF - Packet Switching Fabric

PSTN - Public Switched Telephone Network

PSU - Power Supply Unit

PVC - Permanent Virtual Circuit

QoS - Quality of Service

RADIUS - Remote Authentication Dial-In User Service

RAN - Remote Access Node

RAS - Remote Access Service

RAS - Registration Admission and Status

RAU - Rack Assembly Unit

RDE - Routes Determination Element

RDN - Radio Data Network

RED - Random Early Detection

RESIP - RESielent IP

RFC - Request For Comments

RGW - Residential Gateway

RIP - Routing Information Protocol

ROI - Return On Investment

RSD - Routing Server Daemon

RSU - Remote Subscriber Unit

RSVP - ReSource reserVation Protocol

RTCP - Real-time Transport Control Protocol

RTM - Rear Transition Module

RTP - Real time Transport Protocol

RUDP - Reliable Universal Datagram Protocol

SAC - Service Accept

SAP - Session Announcement Protocol

SBC - Session Border Controller

SCCP - Signaling Connection Control Part

SCE - Service Creation Environment

SCF - Service Control Function

SCM - System Control Module

SCN - Switched Circuit Network

SCP - Service Control Point

SCTP - Stream Control Transmission Protocol

SDH - Synchronous Digital Heirarchy

SDP - Session Description Protocol

SDSL - Synchronous Digital Subscriber Line

SEP - Signaling End Point

SFM - Switch Fabric Module

SFP - Small Form-factor Pluggable

SG - SS7 Signaling Gateway

SHA - Secure Hash Algorithm

SIGTRAN - Signaling Transport working group from IETF

SIP - Session Initiation Protocol

SIP A - SIP Interface to non-MGC SIP Servers

SIP I - SIP Interface to other MGC with encapsulated

ISUPSIP M - SIP Interface to Media Server (MRF)

SIP NNI - SIP Network-Network Interface

SIP T - Session Initiation Protocol for Telephones

SIP U - SIP Interface to user equipment (e.g. SIP IAD)

SLA - Service Level Agreement

SMC - Service Management Center

SME - Small and Medium-sized Enterprise

SMI - Structure of Managed Information

SMM - Session Monitoring Module

SMS - System Management Server

SMTP - Simple Mail Transfer Protocol

SNMP - Simple Network Management Protocol

SONET - Synchronous Optical Network

SP - Service Provisioner (NetManager)

SPC - Semi-Permanent Connection

SPC - Signaling Point Code

SPD - Subscriber Profile Database

SPF - Shortest Path First

SP IA - Service Provisioner Internet Access

SP ISS - Service Provisioner Internet Supplementary Services

SQL - Structured Query Language

SRB - Session Resource Broker

SRJ - Service Reject

SRP - Signaling Relay Point

SRP - System Resource Platform

SRQ - Service Request

SRS - System Route Server

SRTP - Sequenced Routing Update Protocol

SS - Supplementary Service

SS7 - Signaling System number 7

SSF - Service Switching Function

SSG - Standalone Signaling Gateway

SSH - Secure Shell

SSL - Secure Sockets Layer

SSP - Service Switching Point

SSU - Synchronization Supply Unit

SSW - SoftSWitch

STI - Statistical Time Interval

STM - Synchronous Transport Module

STM1 - Synchronous Transfer Module level 1

STP - Signaling Transfer Point

SVGA - Super Video Graphics Aray

SVM - Software Version Manager

SW - SoftWare

T1 - AT&T term for digital carrier facility used to transmit a DS1 formatted digital signal at 1.522 Mbps (North American)

TC - Transaction Capabilities

TCAP - Transaction Capabilities Application Part (part of SS7)

TCF - Training Check Frame

TCO - Total Cost of Ownership

TCP - Transmission Control Protocol

TCP IP - Transmission Control Protocol Internet Protocol

TCS - Terminal Capabilities Set

TDM - Time Division Multiplexing

TE - Terminal Equipment

TED - Traffic Engineering Database

Telco - Telecommunications Operator

TeS - Telephony Server

TFTP - Trivial File Transfer Protocol

TG - Trunk Group

TGCP - PacketCable Trunking Gateway Control Protocol

TGW - Trunk Gateway

TGW - Trunking Gateway

TL1 - Transaction Language 1

TLS - Transport Layer Security

TMM - Table Maintenance Manager tool

TMP - Table Maintenance Procedure

ToS - Type of Service

TRQ - Terminate Request

TS - Time Slot

TSAP - Transport layer Service Access Point

TSP - Technology Service Provider

TTL - Time To Live

TTS - Text-to-Speech

TUA - TCAP User Adaptation Layer

UA - User Agent

UAC - User Agent Client

UAS - Universal Access Server

UAS - User Agent Server

UDI - Unrestricted Digital Information

UDP - User Datagram Protocol

UI - User Interface

UPD - User Profile Database

UPnP - Universal Plug and Play

URI - Uniform Resource Indicator

URL - Universal Resource Locator

uRPF - unicast Reverse Path Forwarding

USBS - Unified Service for Billing Systems

VAD - Voice Activity Detection

VBD - Voice Band Data

VCE - Voice Call Element

VCN - Virtual Compound Network

VDSL - Variable Digital Subscriber Line

VGW - Voice Gateway

VLAN - Virtual Local Area Network

VLSM - Variable Length Subnet Masks

VMS - Voice Mail Server

VMWI - Visual Message Wait Indication

VOCODER - VOice COder-decoDER

VoDSL - Voice Over DSL

VoIP - Voice over IP

VoP - Voice Over Packet

VoTDM - Voice over TDM

VPN - Virtual Private Network

VRRP - Virtual Router Redundancy Protocol

VT - Virtual Tributary

VT - Video Terminal

VTKG - Virtual Trunk Group

WAN - Wide Area Network

WL - White List

WLN - Wire Line Network

WRR - Weighted Round Robin

XML - eXtensible Markup Language