Telephone call

callphone callphone callsvoice callcallsvoice callingvoicecallingconducting callstelephone calls
A telephone call is a connection over a telephone network between the called party and the calling party.wikipedia
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Telephone network

Network engineeringtelephonefixed and mobile networks
A telephone call is a connection over a telephone network between the called party and the calling party.
A telephone network is a telecommunications network used for telephone calls between two or more parties.

Called party

calleebe calledcall receiver
A telephone call is a connection over a telephone network between the called party and the calling party. When a telephone call has more than one called party it is referred to as a conference call.
The called party (in some contexts called the "B-Number") is a person who (or device that) answers a telephone call.

Calling party

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

Conference call

conference callingconference callsaudio conferencing
When a telephone call has more than one called party it is referred to as a conference call.
A conference call is a telephone call in which someone talks to several people at the same time.

Hotline

hot linetelephone hotlinehot-lines
This is called a hot line or ringdown.
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

Alexander Graham Bell

BellGraham BellBell, Alexander Graham
The first telephone call was made on March 10, 1876 by Alexander Graham Bell.
In January 1915, Bell made the first ceremonial transcontinental telephone call.

Dial tone

dial-tonedialling tonestutter dial tone
Otherwise, the calling party is usually given a tone to indicate they should begin dialing the desired number.
It indicates that the exchange is working and is ready to initiate a telephone call.

Telephone exchange

exchangescentral officeexchange
Most telephone calls through the PSTN are set up using ISUP signalling messages or one of its variants between telephone exchanges to establish the end to end connection.
An exchange consists of electronic components and in older systems also human operators that interconnect (switch) telephone subscriber lines or virtual circuits of digital systems to establish telephone calls between subscribers.

ISDN User Part

ISUP
Most telephone calls through the PSTN are set up using ISUP signalling messages or one of its variants between telephone exchanges to establish the end to end connection.
The ISDN (Integrated Services Digital Network) User Part or ISUP is part of Signaling System No. 7 (SS7), which is used to set up telephone calls in the public switched telephone network (PSTN).

Switchboard operator

telephone operatoroperatoroperators
In some (now very rare) cases, if the calling party cannot dial calls directly, they will be connected to an operator who places the call for them.
With the development of computerized telephone dialing systems, many telephone calls which previously required a live operator can be placed automatically by the calling party without additional human intervention.

Public switched telephone network

PSTNtelephone networkpublic telephone network
Calls may be placed through a public network (such as the Public Switched Telephone Network) provided by a commercial telephone company or a private network called a PBX.
Alerting another user of the desire to establish a telephone call was accomplished by whistling loudly into the transmitter until the other party heard the alert.

Collect call

1800 Reversecollectcharges reversed
However, in some circumstances such as a reverse charge or collect call, the called party pays the cost of the call.
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.

Flat rate

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In some circumstances, the caller pays a flat rate charge for the telephone connection and does not pay any additional charge for all calls made.
American telecommunications companies commonly offer a flat rate to residential customers for local telephone calls.

Rotary dial

dialrotary telephonerotary phone
The caller then rotary dials or presses buttons for the phone number needed to complete the call, and the call is routed to the phone which has that number.
It is used when initiating a telephone call to transmit the destination telephone number to a telephone exchange.

Operator assistance

operator-assistedassistCall Operator
A special number can be dialed for operator assistance, which may be different for local vs. long-distance or international calls.
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.

Mobile phone

cell phonemobilemobile phones
The call may use land line, mobile phone, satellite phone or any combination thereof.
A mobile phone, cell phone, cellphone, or hand phone, sometimes shortened to simply mobile, cell or just phone, is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.

Call-progress tone

Number unobtainable tonetones
Preceding, during, and after a traditional telephone call is placed, certain tones signify the progress and status of the telephone call:
In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user.

Telephone number

phone numbertelephone numbersphone numbers
Fees depend on the provider of the service, the type of service being used (a call placed from a landline or wired telephone will have one rate, and a call placed from a mobile telephone will have a different rate) and the distance between the calling and the called parties.
A telephone number serves as an address for switching telephone calls using a system of destination code routing.

Local call

local phone calls
Some types of calls are not charged, such as local calls (and internal calls) dialed directly by a telephone subscriber in Canada, the United States, Hong Kong, United Kingdom, Ireland or New Zealand (Residential subscribers only).
1) Any call using a single switching center; that is, not traveling to another telephone network;

Skype

SkypingSkype PreviewMicrosoft Skype
Voice over IP technology allows calls to be made through a PC, using a service like Skype.
Voice chat allows telephone calls between pairs of users and conference calling and uses a proprietary audio codec.

Ringing tone

ringback toneringback tonesAudible ringing
a ringing tone signifying that the called party has yet to answer the telephone
Audible ringing (ringing tone, colloquially also ringback tone) is a signaling tone in telecommunication that is heard by the originator of a telephone call while the destination terminal is alerting the receiving party.

Prank call

prank callsprank phone callsprank phone call
Common kinds of unwanted calls include prank calls, telemarketing calls, and obscene phone calls.
A prank call (also known as a crank call, phony call or hoax call) is a telephone call intended by the caller as a practical joke played on the person answering.

Busy signal

engaged tonebusybusy tone
a busy signal (or engaged tone) signifying that the called party's telephone is being used in a telephone call to another person (or is "off the hook" though no number has been dialled, i.e. the customer does not want to be disturbed)
A busy signal (or busy tone or engaged tone) in telephony is an audible or visual signal to the calling party that indicates failure to complete the requested connection of that particular telephone call.

Telephone phobia

Telephone phobia
Telephone phobia (telephonophobia, telephobia, phone phobia) is reluctance or fear of making or taking phone calls, literally, "fear of telephones".

Call completion

Call completion
There are several possible factors which can prevent a telephone call from connecting successfully: