List of telephony terminology

List of telephony terminology

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


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


*call originator - (or "calling party", "caller" or "A-party") a person or device that initiates a telephone call by dialling a telephone number.
*call waiting - a system that notifies a caller of another incoming telephone call by sounding a sound in the earpiece.
*called party
*calling party
*conference call (multi-party call)


*emergency telephone number
*end instrument
*Engset calculation
*Erlang unit


*fax - (contraction of "facsimile") a device connected to the telephone network to enable documents to be scanned and sent to a receiving fax machine.


*help desk
*Hunt Group


*interactive voice response (IVR)


*local loop
*long-distance operator


*operator assistance


*Plain old telephone service, or "POTS"


*red telephone box
*Red box
*ringer equivalency number (REN)
*Ringing signal
*rural radio service



*Tandem switch
*telephone booth
*telephone call
*telephone card
*telephone directory
*telephone exchange
*telephone tapping
*Teletraffic engineering
*trap and trace


*vertical service code


*Western Union
*Wide Area Telephone Service (WATS)
*WATS line
*wireless network


*Zenith number


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