Telephony

thumb|An old rotary dial telephone thumb|AT&T push button telephone made by [[Western Electric, model 2500 DMG black, 1980]]

portable device to make telephone calls using a radio link

thumb|ISDN telephone

Telephony ( ) is the field of technology involving the development, application, and deployment of telecommunications services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone.

centralized office for receiving or transmitting a large volume of requests by telephone

computer server

aggregate of all circuit-switched telephone networks

thumb|right|200px|A landline telephone device A landline, or fixed line, is telephone service provided to a subscriber via cable or wire, i.e. metal conductors or optical fiber. The term differentiates a telephone service from the now ubiquitous wireless service. A landline allows multiple telephones to operate simultaneously on the same phone number. It is loosely described as plain old telephone service (POTS).

provision of service to customers

telecommunications system used in public switched telephone networks or in large enterprises

any broadband network architecture using optical fiber to provide all or part of the local loop used for last mile telecommunications

device to record caller messages

parapsychology recordings with anomolous haunting sounds investigated as spirit voices

connection over a telephone network between the called party and the calling party

resource intended to provide information and support related to an organization's products and services

management of information technology services that meet the needs of a business

set of telephony signaling protocols

A dialer (American English) or dialler (British English) is an electronic device or software that connects to a telephone line to monitor dialed numbers and automatically modify them for seamless access to services requiring long national or international access codes. It inserts or alters numbers based on the time of day, country, or area code, enabling users to connect through service providers offering the best rates. For example, it might use one provider for international calls and another for mobile networks. This technique is known as prefix insertion or least-cost routing. A line-power

service of resolving technical problems for end users of an organization's products or services, often remotely

form of criminal phone fraud, using social engineering over the telephone system to gain access to private personal and financial information for the purpose of financial reward

policies for meeting archival requirements of persistent data and records management

practice of signaling by making a deliberately incomplete telephone call

data record that contains attributes that are specific to a single instance of a phone call or other communication transaction

also known as a terminal server

GOOG-411 (or Google Voice Local Search) was a telephone service launched by Google in 2007, that provided a speech-recognition-based business directory search, and placed a call to the resulting number in the United States or Canada. The service was accessible via a toll-free telephone number. It was an alternative to 4-1-1, an often-expensive service provided by local and long-distance phone companies, and was therefore commonly known as Google 411. This service was discontinued on November 12, 2010.

thumb|right|Le Théâtrophone, an 1896 lithograph from the ''Les Maitre de L'Affiches'' series by [[Jules Chéret]] Théâtrophone (, "the theatre phone") was a telephonic distribution system available in portions of Europe that allowed the subscribers to listen to opera and theatre performances over the telephone lines. The théâtrophone evolved from a Clément Ader invention, which was first demonstrated in 1881, in Paris. Subsequently, in 1890, the invention was commercialized by Compagnie du Théâtrophone, which continued to operate until 1932.

Business providing access to telephones

air pipe through which speech can be transmitted over an extended distance

service connecting human interpreters to users via telephone

audio frequencies used for the transmission of speech

preventing or removin echo in telephony

Wardialing (or war dialing) is a technique to automatically scan a list of telephone numbers, usually dialing every number in a local area code to search for modems, computers, bulletin board systems (computer servers) and fax machines. Hackers use the resulting lists for various purposes: hobbyists for exploration, and crackers—malicious hackers who specialize in breaching computer security—for guessing user accounts (by capturing voicemail greetings), or locating modems that might provide an entry-point into computer or other electronic systems. It may also be used by security personnel, for

dials a list of telephone numbers and connects answered dials to people making calls

QSIG is an ISDN based signaling protocol for signaling between private branch exchanges (PBXs) in a private integrated services network (PISN). It makes use of the connection-level Q.931 protocol and the application-level ROSE protocol. ISDN "proper" functions as the physical link layer.

interoperability protocol used in wireless telephony

return call in telecommunications

technology

switch that operates when sound over a certain threshold is detected

electrical test equipment

Microsoft Windows API

thumb | Phone Patch in Vietnam War, 1969 An autopatch, sometimes called a phone patch, is a feature of an amateur radio repeater, two-way radio, or base station to access an outgoing telephone connection. Users with a transceiver capable of producing touch tones (DTMF signals) can make a telephone call, typically limited by settings in the autopatch module to be only to flat-rate numbers, such as local calls or toll-free numbers.

landline telephone option that lets European customers use a third party for call charges

Wikimedia list article

system allowing providers of communication services to charge customers based on service usage

thumb|Silicon Laboratories Si3210M-FM - Programmable CMOS SLIC/Codec with Ringing/Battery Voltage Generation (Performs all BORSCHT functions) BORSCHT is an acronym for the set of functions performed by a subscriber line interface circuit (SLIC) in the line card of a telecommunication system providing plain old telephone service. The letters represent the following functions: battery feed (B), overvoltage protection (O), ringing (R), signaling (S), coding (C), hybrid (H), and test (T).

telephone service provided by lodging establishments