Telephone

phonetelephonesLocal Telephone Servicefixed telephonyphonestelephonyFixed-Line TelephonyTelephone numbertelephone receiverfixed
A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.wikipedia
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Signaling (telecommunications)

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Signalling began in an appropriately primitive manner.
In the early days of telephony, with operator handling calls, the addressing formation is by voice as "Operator, connect me to Mr. Smith please".

Telephone plug

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Telephone plug
A telephone plug is a type of connector used to connect a telephone set to the telephone wiring inside a building, establishing a connection to a telephone network.

Telephone tapping

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Telephone tapping
Telephone tapping (also wire tapping or wiretapping in American English) is the monitoring of telephone and Internet conversations by a third party, often by covert means.

Videotelephony

videoconferencingvideo conferencingvideo chat
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.
A videophone is a telephone with a video display, capable of simultaneous video and audio for communication between people in real-time.

Bell System

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Bell System
Receiving a U.S. patent for the invention of the telephone on March 7, 1876, Alexander Graham Bell formed the Bell Telephone Company in 1877, which in 1885 became AT&T.

Analog telephone adapter

analog telephony adapterATAAnalogue Telephone Adaptors
The customer equipment may be an analog telephone adapter (ATA) which interfaces a conventional analog telephone to the IP networking equipment, or it may be an IP Phone that has the networking and interface technology built into the desk-top set and provides the traditional, familiar parts of a telephone, the handset, the dial or keypad, and a ringer in a package that usually resembles a standard telephone set.
The ATA provides dial tone, Ringing Generator, DC power, caller ID data and other standard telephone line signaling (known collectively as BORSCHT) to the telephone connected to a modular jack.

Patent caveat

caveat
28 December 1871: Antonio Meucci files patent caveat No. 3335 in the U.S. Patent Office titled "Sound Telegraph", describing communication of voice between two people by wire. A 'patent caveat' was not an invention patent award, but only an unverified notice filed by an individual that he or she intends to file a regular patent application in the future.
Perhaps the most famous example of such a conflict was on 14 February 1876, when Elisha Gray filed a patent caveat and Alexander Graham Bell filed a patent application on the same day, both relating to the telephone.

Telegraphy

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Early telephones used a single wire for the subscriber's line, with ground return used to complete the circuit (as used in telegraphs).
The decline began with the growth of the use of the telephone.

Satellite phone

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Satellite phone
LEO telephones utilize LEO (low Earth orbit) satellite technology.

Harvard sentences

Harvard sentences
The Harvard sentences are a collection of sample phrases that are used for standardized testing of Voice over IP, cellular, and other telephone systems.

Human voice

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A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.

Small appliance

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Telephones rapidly became indispensable to businesses, government and households and are today some of the most widely used small appliances.

Headphones

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The essential elements of a telephone are a microphone (transmitter) to speak into and an earphone (receiver) which reproduces the voice in a distant location.

Sound

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A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.

Technological convergence

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Convergence has given most modern cell phones capabilities far beyond simple voice conversation.

Answering machine

telephone answering machineanswer phoneanswering machines
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Text messaging

text messagetextingtext messages
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Camera phone

cameracamera phonescell phone cameras
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Video game

video gamesgamevideogame
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Mobile browser

mobile web browsermicrobrowserbrowser
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Turn-by-turn navigation

turn-by-turnturn-by-turn directionsGPS' turn-by-turn navigation
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Virtual reality

virtualVRvirtual-reality
They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music or games, surf the Internet, do road navigation or immerse the user in virtual reality.

Electromagnetic interference

interferenceradio frequency interferenceradio interference
A twisted pair line rejects electromagnetic interference (EMI) and crosstalk better than a single wire or an untwisted pair.

Crosstalk

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A twisted pair line rejects electromagnetic interference (EMI) and crosstalk better than a single wire or an untwisted pair.