Acronym
|
Name
|
Notes
|
1ESS |
Number 1 Electronic Switching System (Alcatel-Lucent) |
US
|
1FR |
Flat rate service |
US
|
2G |
second-generation mobile telephone |
|
2.5G |
Enhanced 2G mobile telephone |
|
3G |
third-generation mobile telephone |
|
4ESS
|
Number 4 Electronic Switching System (Alcatel-Lucent)
|
|
4WTS |
Four-wire termination set |
US
|
5ESS
|
Number 5 Electronic Switching System (Alcatel-Lucent)
|
|
ACD |
Automatic Call Distribution/Director |
|
ACTS |
Advanced Coin Telephone Service |
US
|
ADSL |
Asymmetric Digital Subscriber Line |
|
ANI |
Automatic Number Identification |
US
|
AMA |
Automatic Message Accounting |
US
|
BOK |
Unblocking |
UK
|
CCIS |
Common Channel Interoffice Signaling |
|
CID |
Caller ID |
|
CLEC |
Competitive Local Exchange Carrier |
US
|
CLI |
Caller Line Identification |
Europe
|
CLID |
Caller Line ID |
UK
|
CTI |
Computer telephony integration |
|
COSMOS |
Wire records |
|
DDCO |
Direct Dial Central Office (Opposite of DID) |
US
|
DDD |
Direct Distance Dialing |
US
|
DDI |
Direct Dialing In |
UK
|
DECT |
Digital Enhanced Cordless Telecommunications |
|
DID |
Direct Inward Dialing |
US
|
DMS |
Digital Multiplex System (e.g. DMS-100) |
Can
|
DNIS |
Dialed Number Identification System |
US
|
DSL |
Digital subscriber line |
|
DTMF |
dual-tone multi-frequency |
|
FDM |
Frequency-division multiplexing |
|
GPRS |
General Packet Radio Service |
|
GSM |
Global system for mobile communications |
|
GST |
Ground Start Trunk |
US
|
IDDD |
International Direct Distance Dialing |
US
|
IDF |
Intermediate distribution frame |
US
|
ILEC |
Incumbent Local Exchange Carrier |
US
|
ISD |
International Subscriber Dialing |
UK and India
|
ISDN |
Integrated Services Digital Network |
|
IVR |
Interactive Voice Response (a.k.a. VRU) |
|
KSU |
Key Switching/System Unit |
US
|
LST |
Loop Start Trunk |
US
|
MDF |
Main Distribution Frame |
|
MF |
Multi-frequency |
US
|
PABX |
Private Automatic Branch eXchange |
Europe
|
PBX |
Private Branch eXchange |
US
|
PMBX |
Private Manual Branch eXchange |
UK
|
POTS |
Plain Old Telephone Service |
|
PSTN |
Public Switched Telephone Network |
|
RCMAC |
Recent Change Memory Administration Center |
US
|
REN |
ringer equivalency number |
|
SMS |
Short Message Service (i.e. text messages) |
|
SF |
Single Frequency supervision tone (2600) |
US
|
SIP |
Session Initiation Protocol |
US
|
SP Lock |
Unlocking |
UK
|
SS7 |
Signaling System 7 |
|
STD |
Subscriber trunk dialling |
UK and India
|
T-CXR |
T-carrier (e.g. T-1) |
US
|
TAPI |
Telephony Application Programming Interface |
|
TR |
Tip and ring |
US
|
TSPS |
Traffic Service Position System |
|
TXE |
Telephone eXchange Electronic |
UK
|
UAX |
Unit Automatic eXchange |
UK
|
VoIP |
Voice over Internet Protocol |
US
|
WAP |
Wireless Application Protocol |
|
WATS |
Wide Area Telephone Service |
US
|
WTAI |
Wireless Telephony Applications Interface |
|