AE - Authenticating Entity
AIN - Advanced Intelligent Network
AMPS - Advanced Mobile Phone System (analogue)
ANSI - American National Standards Institute
AP - Access Point
API - Application Programming Interface
AUC - Authentication Centre


BNF - Backus-Naur Form


CAN - Customer Access Network
CCAF - Call Control Agent Function
CCF - Call Control Function
CCITT - Consultative Committee on International Telegraphy and Telephony
CCS7 - Common Channel Signaling No.7
CER - Call Event Record
CFB - Call Forward Busy
CIC - Carrier Access Code
CID - Customer Identifier
CLI - Calling Line Identification
CLIP - Calling Line Identification Presentation
CLIR - Calling Line Identification Restriction
CNM - Customer Network Management
CPE - Customer Premises Equipment
CPI - Calling Person Identification
CSS - Customer Support System (Systems)
CTIA - Cellular Telecommunications Industry Association
CTI - Computer Telephony Integration


DCS1800 - Digital Cellular (1800Mhz)
DECT - Digital Enhanced Cordless Telephony
DTMF - Dual Tone Multi Frequency


ECMA - European Computer Manufacturer Association
ETR - ETSI Technical Report
ETSI - European Telecommunications Standards Institute


FCC - Federal Communications Commission
FMC - Fixed Mobile Convergence
FMI - Fixed Mobile Integration
FNN - Full National Number


GoS - Grade of Service
GPS - Global Positioning System
GSM - Global System for Mobiles


HLR - Home Location Register
HTML - HyperText Markup Language [HTML4]
HTTP - HyperText Transfer Protocol [RFC2068]


IANA - Internet Assigned Number Authority
IMSI - International Mobile Subscriber Identity
INAP - Intelligent Network Application Part
IN - Intelligent Network
IP - Intelligent Peripheral
ISUP - ISDN Signaling User Part (signaling)
ITU - International Telecommunications Union
IVR - Interactive Voice Response
IWU - Interworking Unit


LSB - Least Significant Bits


MAP - Mobile Application Part
MML - Man Machine Language
MOU - Memorandum of Understanding
MSB - Most Significant Bits
MSC - Mobile Switching Centre
MTBF - Mean Time Between Failure
MTBR - Mean Time Before Repair


NE - Network Element
NMT - Nordic Mobile Telephone System
NSN - National Significant Number
NTP - Network Termination Point


OMS - Operations and Maintenance System
OSS - Operational Support System


PABX - Private Automatic Branch Exchange
PACTS - Public Access Cordless Telecommunication Service
PBX - Private Branch Exchange
PCN - Personal Communications Network
PCS - Personal Communication Service
PDA - Personal Digital Assistant
PHS - Personal Handyphone System
PIN - Personal Identification Number
PLMN - Public Land Mobile Network
PMTS - Public Mobile Telephone System
PN - Personal Number
POI - Point of Interconnect
POTS - Plain Old Telephone Service
PSTN - Public Switched Telephone Network
PSTS - Public Switched Telephone Service
PTO - Public Telecommunication Operator


QEAN - Quick Entry Access Number
QOS - Quality of Service


RFC - Request For Comments


SCE - Service Creation Environment
SCF - Service Control Function
SCP - Service Control Point
SDF - Services Data Function
SDK - Software Development Kit
SDP - Services Data Point
SIM - Subscriber Identity Module
SIO - Services In Operation
SMC - Security Management Centre
SMF - Service Management Function
SMS - Service Management System
SMTP - Simple Mail Transfer Protocol
SN - Service Node
SQL - Structured Query Language
SRF - Specialised Resource Function
SSF - Service Switching Function
SSP - Service Switching Point
STD - Subscriber Trunk Dialling
STP - Signaling Transfer Point


TCAP - Transaction Capability Application Part
TMN - Telecommunications Management Network


UCS - Universal Multiple-Octet Coded Character Set
UI - User Interface
UPT - Universal Personal Telecommunication
URL - Uniform Resource Locator [RFC2396]
UTF - UCS Transformation Format


VAS - Value Added Service
VLR - Visitor Location Register
VMB - Voicemail Box
VMP - Voicemail Platform


W3C - World Wide Web Consortium
WAE - Wireless Application Environment
WAP - Wireless Application Protocol
WBMP - Wireless BitMaP
WML - Wireless Markup Language
WSP - Wireless Session Protocol
WTAI - Wireless Telephony Applications Interface
WTA - Wireless Telephony Applications
WTP - Wireless Transport Protocol
WWW - World Wide Web