List of telephony terminology

This is a list of telephony terminology and acronyms which relate to telephony networks.

A

B

  • Blue box - a device that was used to bypass the normal long-distance call switching tones typically used to obtain free calls.

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D

E

F

  • Fax - (contraction of facsimile) a device connected to the telephone network to enable documents to be scanned and sent to a receiving fax machine
  • Frame - A distribution frame, a set of open wiring racks where circuits are cross connected to trunks and equipment

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Acronyms

Acronym Name Notes
1ESSNumber 1 Electronic Switching System (Alcatel-Lucent)US
1FRFlat rate serviceUS
2Gsecond-generation mobile telephone 
2.5GEnhanced 2G mobile telephone 
3Gthird-generation mobile telephone 
4ESS Number 4 Electronic Switching System (Alcatel-Lucent)
4WTSFour-wire termination setUS
5ESS Number 5 Electronic Switching System (Alcatel-Lucent)
ACDAutomatic Call Distribution/Director 
ACTSAdvanced Coin Telephone ServiceUS
ADSLAsymmetric Digital Subscriber Line 
ANIAutomatic Number IdentificationUS
AMAAutomatic Message AccountingUS
BOKUnblockingUK
CCISCommon Channel Interoffice Signaling 
CIDCaller ID 
CLECCompetitive Local Exchange CarrierUS
CLICaller Line IdentificationEurope
CLIDCaller Line IDUK
CTIComputer telephony integration 
COSMOSWire records 
DDCODirect Dial Central Office (Opposite of DID)US
DDDDirect Distance DialingUS
DDIDirect Dialing InUK
DECTDigital Enhanced Cordless Telecommunications 
DIDDirect Inward DialingUS
DMSDigital Multiplex System (e.g. DMS-100)Can
DNISDialed Number Identification SystemUS
DSLDigital subscriber line 
DTMFdual-tone multi-frequency 
FDMFrequency-division multiplexing 
GPRSGeneral Packet Radio Service 
GSMGlobal system for mobile communications 
GSTGround Start TrunkUS
IDDDInternational Direct Distance DialingUS
IDFIntermediate distribution frameUS
ILECIncumbent Local Exchange CarrierUS
ISDInternational Subscriber DialingUK and India
ISDNIntegrated Services Digital Network 
IVRInteractive Voice Response (a.k.a. VRU) 
KSUKey Switching/System UnitUS
LSTLoop Start TrunkUS
MDFMain Distribution Frame 
MFMulti-frequencyUS
PABXPrivate Automatic Branch eXchangeEurope
PBXPrivate Branch eXchangeUS
PMBXPrivate Manual Branch eXchangeUK
POTSPlain Old Telephone Service 
PSTNPublic Switched Telephone Network 
RCMACRecent Change Memory Administration CenterUS
RENringer equivalency number 
SMSShort Message Service (i.e. text messages) 
SFSingle Frequency supervision tone (2600)US
SIPSession Initiation ProtocolUS
SP LockUnlockingUK
SS7Signaling System 7 
STDSubscriber trunk diallingUK and India
T-CXRT-carrier (e.g. T-1)US
TAPITelephony Application Programming Interface 
TRTip and ringUS
TSPSTraffic Service Position System 
TXETelephone eXchange ElectronicUK
UAXUnit Automatic eXchangeUK
VoIPVoice over Internet ProtocolUS
WAPWireless Application Protocol 
WATSWide Area Telephone ServiceUS
WTAIWireless Telephony Applications Interface 
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