- Telephone call
A telephone call is a connection over a
telephone networkbetween the calling partyand the called party.
telephonecall may carry ordinary voice transmission using a telephone, data transmissionwhen the calling party and called party are using modems, or facsimile transmission when they are using faxmachines. The call may use land line, cell phone, satellite phoneor any combination thereof. Where a telephone call has more than one called partyit is referred to as a conference call. When two or more users of the network are sharing the same physical line, it is called a party line or Rural phone line.
Calls are usually placed through a network (such as the
Public Switched Telephone Network) provided by a commercial telephone company. If the caller's wireline phone is directly connected to the calling party, when the caller takes their telephone off-hook, the calling party's phone will ring. This is called a hot lineor ringdown. Otherwise, the calling party is usually given a tone to indicate they should begin dialing the desired number. In some (now very rare) cases, the calling party cannot dial calls directly, and is connected to an operator who places the call for them.
Most telephone calls in the world are set up using ISUP messages or one of its variants between
telephone exchanges to establish the end to end connection.
Some types of calls are not charged, such as
local calls (and Internal calls) dialled directly by a telephone subscriber in Canada, the United States, Hong Kong, United Kingdom, Irelandor New Zealand(Residential subscribers only). In most other areas, all telephone calls are charged a fee for the connection. Fees depend on the provider of the service, the type of service being used (a call placed from a landlineor wired telephone will have one rate, and a call placed from a mobile telephonewill have a different rate) and the distance between the calling and the called parties. In most circumstances, the calling party pays this fee. However, in some circumstances such as a reverse chargeor collect call, the called party pays the cost of the call. In some circumstances, the caller pays a flat ratecharge for the telephone connection and does not pay any additional charge for all calls made. Telecommunication liberalization has been established in several countries to allows customers to keep their local phone provider and use an alternate provider for a certain call in order to save money.
Placing a call
A typical phone call is placed by picking the phone handset up off the base and holding the handset so that the hearing end is next to the user's ear and the speaking end is within range of the mouth. Headsets are becoming more and more common, especially in car headsets, thus changing the way that people are conducting telephone calls in modern times.
In addition to the traditional method of placing a telephone call, newer ways today enable various methods for initiating a telephone call. The technology of Voice over IP
VoIPallows calls to be made through a PC, like with the service of Skype. Other services enable callers to initiate a telephone call without exchanging their phone numbers through a third party [ [http://www.beemask.com/ See - Beemask - Private Calling] ] .
Preceding, during, and after a traditional telephone call is placed, certain tones signify the progress and status of the telephone call:
dial tonesignifying that the system is ready to accept a telephone numberand connect the call
** a ringing tone signifying that the calling party has yet to answer the telephone
** a busy signal (or engaged tone) signifying that the calling party's telephone is being used in a telephone call to another person (or is "off the hook" though no number has been dialled, ie the customer does not want to be disturbed)
** a fast busy signal (or overflow busy tone) signifying that there is congestion in the telephone network, or possibly that the calling subscriber has delayed too long in dialling all the necessary digits. The fast busy signal is generally twice as fast as the normal busy signal.
status tonessuch as STD notification tones (to inform the caller that the telephone call is being trunk dialled at a greater cost to the calling party), minute minder beeps (to inform the caller of the relative duration of the telephone call on calls that are charged on a time basis), and others
* a tone (sometimes the busy signal, often the dial tone) to signify that the called party has hung up.
* tones used by earlier inband telephone switching systems were simulated by a Red box or a blue box used by "phone phreaks" to illegally make or receive free trunk/toll calls..
Unsolicited telephone calls are a modern nuisance. Common kinds of unwanted calls include prank calls, telemarketingcalls, and obscene phone calls. Caller IDprovides some protection against unwanted calls, but can still be turned off by the calling party. Even where end-user Caller ID is not available, calls are still logged, both in billing records at the originating telco and via automatic number identification, so the perpetrator's phone number can still be discovered in many cases. However, this does not provide complete protection: harassers can use payphones, in some cases, automatic number identification itself can be spoofed or blocked, and mobile telephone abusers can (at some cost) use "throwaway" phones or SIMs.
* Rabinow, J., US patent|2813154 -- "Telephone call indicator" -- November 12, 1957
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Look at other dictionaries:
telephone call — telephone ,call noun count an occasion when you speak to someone on the telephone: PHONE CALL: have/receive/get a telephone call: I had an important telephone call from Geneva. make a telephone call: I have to make a quick telephone call … Usage of the words and phrases in modern English
telephone call — telephone .call n when you speak to someone by telephone ▪ There s a telephone call for you, Mr Baron. have/get/receive a telephone call ▪ I had a telephone call from George this morning. ▪ Can I make a quick telephone call ? … Dictionary of contemporary English
telephone call — UK / US noun [countable] Word forms telephone call : singular telephone call plural telephone calls an occasion when you speak to someone on the telephone have/receive/get a telephone call: I had an important telephone call from Geneva. make a… … English dictionary
telephone call — noun (C) an attempt to speak to someone by telephone: There s a telephone call for you, Mr Baron … Longman dictionary of contemporary English
telephone call — noun a telephone connection (Freq. 2) she reported several anonymous calls he placed a phone call to London he heard the phone ringing but didn t want to take the call • Syn: ↑call, ↑phone call • Derivationally related … Useful english dictionary
telephone call — noun a) A connection established over a telephone network between two parties. b) The conversation held by the two parties on this connection. Syn: call, phone call, telephone conversation … Wiktionary
telephone call — n. see call1,12 17 * * * 12 17 see call 1 … Combinatory dictionary
Telephone call flow with simple after-operation — 184 Источник: ГОСТ 19472 88: Система автоматизированной телефонной связи общегосударственная. Термины и определения … Словарь-справочник терминов нормативно-технической документации
telephone call-hour — valandinis telefoninio ryšio užimtumas statusas T sritis radioelektronika atitikmenys: angl. telephone call hour vok. Fernsprechleitungsbelegungsstunde, f rus. телефонное часозанятие, n pranc. communication heure, f … Radioelektronikos terminų žodynas
Telephone recording laws — are laws that govern the civilian recording of telephone conversations by the participants (as opposed to laws controlling government or law enforcement wiretapping).Telephone tapping is officially strictly controlled in many countries to… … Wikipedia