Calling party

callercall originatorA-Numbercallcall sourceCaller (telecommunications)
The calling party (in some contexts called the "A-Number") is a person who (or device that) initiates a telephone call.wikipedia
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Telephone call

callphone callphone calls
The calling party (in some contexts called the "A-Number") is a person who (or device that) initiates a telephone call.
A telephone call is a connection over a telephone network between the called party and the calling party.

Called party

calleebe calledcall receiver
The person who, or device that, receives a telephone call is the called party.
The person who (or device that) initiates a telephone call is the calling party.

Calling-party camp-on

* Calling-party camp-on
Such systems may or may not issue a system blocking signal to inform the calling party of the access delay.

Etiquette

mannersprotocolpropriety
In some countries, it is common etiquette for a call originator to identify himself first instead of the receiver, when the connection is established.

Modem

modemsdial-up modem56k modem
Modems and fax machines use different tones when originating or answering a connection, which may be a source of problems for the user.

Fax

fax machinefacsimilefax machines
Modems and fax machines use different tones when originating or answering a connection, which may be a source of problems for the user.

Sports radio

Sportssports talkall-sports
A widespread programming genre that has a narrow audience appeal, sports radio is characterized by an often-boisterous on-air style and extensive debate and analysis by both hosts and callers.

Toll-free telephone number

toll-freetoll-free number800 number
For the calling party, a call to a toll-free number from a landline is free of charge.

Direct distance dialing

direct dialdirect distance dialIDDD
Direct distance dialing (DDD) is a telecommunication service feature in which a caller may, without operator assistance, call any other user outside the local calling area.

Caller ID

caller line identificationCaller-IDCalling Line Identification
Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling number delivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.

Telephone number

phone numbertelephone numbersphone numbers
Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.

Distinctive ring

ringing pattern
Regardless of what ringing pattern the called party hears, the calling party hears the standard ringing pattern.

Call origination

origination serviceorigination
Call origination, also known as voice origination, refers to the collecting of the calls initiated by a calling party on a telephone exchange of the PSTN, and handing off the calls to a VoIP endpoint or to another exchange or telephone company for completion to a called party.

Zenith number

Enterprise numberWX numberZenith
A Zenith number was a special type of telephony service which allowed a calling party to call the number's owner at no charge by requesting the call from a switchboard operator and citing the "Zenith", "Enterprise" or "WX" number.

Operator assistance

operator-assistedStation-to-stationassist
Operator assistance refers to a telephone call in which the calling party requires an operator to provide some form of assistance in completing the call.

Collect call

1800 Reversecollectcollect calling
A collect call in Canada and the United States, known as a reverse charge call in other parts of the English-speaking world, is a telephone call in which the calling party wants to place a call at the called party's expense.

Call-progress tone

call progress toneNumber unobtainable tonetones
The tones are generated by a central office or a private branch exchange (PBX) to the calling party.

Automatic number identification

ANIautomatic number identification (ANI)the caller's number
Modern ANI has two components: information digits, which identify the class of service, and the calling party billing telephone number.

Busy signal

busy toneengaged tonebusy
A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or visual signal to the calling party that indicates failure to complete the requested connection of that particular telephone call.

Misdialed call

wrong numbermisdialmisdialled calls
The recipient of a wrong number is usually unknown to the caller.

Telephone exchange

exchangescentral officeexchange
When a calling party lifted the receiver, the local loop current lit a signal lamp near the jack.

Telephone

phonetelephonesLocal Telephone Service
The place a telephone call, the calling party picks up the telephone's handset, thereby operating a lever which closes the hook switch (A4).

Last-call return

*691471Call Return
The service may also offer the facility to place a call to the calling party.