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Encyclopedia > Dial Tone

A dial tone (known in the British Isles as a dialling tone) is a telephony signal used to indicate that the telephone exchange is working, has recognized an off-hook, and is ready to accept a call. The tone stops when the first numeral is dialed. If no digits are forthcoming, the permanent signal procedure is invoked, often eliciting a special information tone. Image File history File links Question_book-3. ... // The list covers every known character in the G.I. Joe: A Real American Hero series to have received his/her own action figure. ... In telecommunication, Telephony encompasses the general use of equipment to provide voice communication over distances. ... In telecommunication, signalling (or signaling) has the following meanings: The use of signals for controlling communications. ... A telephone operator manually connecting calls with patch cables at a telephone switchboard. ... In telephony, the term off-hook has the following meanings: The condition that exists when a telephone or other user instrument is in use, , during dialing or communicating. ... Look up call in Wiktionary, the free dictionary. ... A numeral is a symbol or group of symbols that represents a number. ... A dial is a generally a flat disk, often with numbers or similar markings on it, used for displaying the setting or output of a timepiece, radio or measuring instrument In telephony and telecommunications in connection with a telephone, a dial refers, in older telephones, to a rotating disk with... Permanent Signal (PS) in US telephony jargon, or Permanent Loop in British usage, is a condition in which a POTS line is off-hook for an extended period of time. ... In telephony, the special information tone is actually a series of three audio tones, which indicate that a telephone call cannot be completed. ...


When automated telephone systems were first being deployed, telephone companies noticed that customers were often confused by the apparent lack of response (before this, a telephone operator would answer), and would often assume the phone was not working. To avoid this, exchange systems would play a small buzzing sound into the line instead. Before modern electronic telephone switching systems came into use, dial tones were usually generated by electromechanical means; in the United States, the standard "city" dial tone consisted of a 600 Hz tone amplitude-modulated at 120 Hz. Some dial tones were simply adapted from 60 Hz AC line current. In the UK, the standard Post Office dial tone was 33 Hz: this was generated by a motor-driven ringing machine in most exchanges, and by a vibrating-reed generator in the smallest. Automation (ancient Greek: = self dictated) or Industrial Automation is the use of computers to control industrial machinery and processes, replacing human operators. ... For other uses, see Telephone (disambiguation). ... TATA Engineering and Locomotive Company A telephone company (or telco) provides telecommunications services such as telephony and data communications. ... A telephone operator at work on a private switchboard A telephone operator is either a person who provides assistance to a telephone caller, usually in the placing of operator assisted telephone calls such as calls from a pay phone, collect calls (called reversed-charge calls in the UK), calls which... In the field of telecommunications, a central office houses equipment that is commonly known as simply a switch, which is a piece of equipment that connects phone calls. ... In engineering, electromechanics combines electromagnetism and mechanics. ... This article is about the SI unit of frequency. ...


The modern dial tone varies between countries, being a "buzz" of two interfering tones (350 Hz and 440 Hz, as defined in the Precise Tone Plan) in the NANP (most of North America), and a constant single tone (425 Hz) in most of Europe. Modems, fax machines, and autodialers must be designed to recognise these so-called call-progress tones, as well as comply with differing standards and regulations. This article describes a type of political entity. ... In acoustics, a beat is an interference between two sounds of slightly different frequencies, perceived as periodic variations in volume whose rate is the difference between the two frequencies. ... Pitch is the perceived fundamental frequency of a sound. ... The Precise Tone Plan specification for the North American network defines the tones used for standard signaling in the PSTN. The tones are as follows: dial tone is a continuous tone having frequencies of 350 and 440 Hz at a level of -13 dBm ringback tone is defined as comprising... The North American Numbering Plan (NANP) is a system for three-digit area codes that direct telephone calls to particular regions on a public switched telephone network (PSTN), where they are further routed by the local network. ... North America North America is a continent [1] in the Earths northern hemisphere and (chiefly) western hemisphere. ... For other uses, see Europe (disambiguation). ... For other uses, see Modem (disambiguation). ... An auto-dialer is an electronic device that can automatically dial telephone numbers to communicate between any two points in the telephone, mobile phone and pager networks. ... All Saints Chapel in the Cathedral Basilica of St. ... In telephony, call progress tones are audible tones sent from the PSTN or a PBX to calling parties to indicate the status of phone calls. ... “Standard” redirects here. ...


Private or internal PBX or key phone system also have their own dial tone, sometimes the same as the external PSTN one, and sometimes different to remind users to dial a prefix for an outside line. PBX redirects here. ... Early model 464G Western Electric Key Telephone Set A key system or key telephone system is a multiline telephone system typically used in small office environments. ... The public switched telephone network (PSTN) is the concatenation of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the worlds public IP-based packet-switched networks. ... A telephone line (or just line) is a single-user circuit on a telephone communications system. ...


A "stuttered" or interrupted dial tone may mean that there is voice mail waiting (see Message Waiting Indicator), or may occur to confirm that a calling feature such as call forwarding has been activated. Stuttering is a speech disorder in which pronunciation of the (usually) first letter or syllable of a word is repeated involuntarily. ... Voicemail (or voice mail; abbreviated v-mail or vmail) is a specific application of an interactive voice response system. ... Message Waiting Indicator Message Waiting Indicator in telephony, is a Bellcore term for an FSK-based telephone calling feature that illuminates an LED on select telephones to notify a telephone user of waiting voicemail messages on most North American public telephone networks and PBXs. ... A service feature is a capability added to a phone line in addition to the basic capability to make and receive telephone calls. ... Call forwarding (or call diverting), in telephony, is a feature on some telephone networks that allows an incoming call to a called party, which would be otherwise unavailable, to be redirected to a mobile telephone or other telephone number where the desired called party is situated. ...


Mobile phones do not have dial tones, as the user instead presses "send" to actually go off-hook and complete the call once the desired phone number is entered. In telephony, the term off-hook has the following meanings: The condition that exists when a telephone or other user instrument is in use, , during dialing or communicating. ...


An experienced guitar player will be able to tune their instrument to a U.S. dial tone, since its two frequencies correspond to the standard concert pitch "A" of 440 Hz, and (approximately) the "F" below. For other uses, see Guitar (disambiguation). ... In music, pitch is the perception of the frequency of a note. ...

Example of a North American dial tone Image File history File links NorthAmericanDialTone. ...

Listen to a dial tone from North America.

Problems listening to the file? See media help.

"Soft" dial tones

A "soft" dial tone is audibly the same as a regular one, except that there is no actual service active on the line, and normal calls cannot be made. It is maintained only so that an attached phone can dial the emergency telephone number (such as 9-1-1 or 1-1-2), in compliance with the law in most places. It can sometimes call the business office of the Local exchange carrier which owns or last leased the line, such as via 6-1-1. Other functions such as ringback or ANAC may also be accessed by technicians in order to facilitate installation or activation. eating ice-cream is fun, yummety yum yum. Often, a new telephone number is assigned to the line so that it can function, but callback is restricted, and end-users do not know the number. These numbers may be outside the normal range used for regular lines, potentially causing trouble when telephone numbering plans are changed. Many countries public telephone networks have a single emergency telephone number, sometimes known as the universal emergency telephone number or occasionally the emergency services number, that allows a caller to contact local emergency services for assistance. ... For other uses, see 911 (disambiguation). ... 1-1-2 (one-one-two) is the emergency telephone number for GSM and Europe. ... Local exchange carrier is a regulatory term in telecommunications for so-called local telephone company. ... This article or section should include material from Tenancy agreement A lease is a contract conveying from one person (the lessor) to another person (the lessee) the right to use and control some article of property for a specified period of time (the term), without conveying ownership, in exchange for... In Canada and the U.S. (with the exception of New York City), 611 is the abbreviated dialing telephone number one dials if there is a problem with the telephone service, or with a payphone. ... Ringback number is a number used by many phone companies to test whether or not a new telephone line is working correctly and the phone number is routing properly. ... An automatic number announcement circuit (ANAC) is a special telephone number that is meant to be used by phone company technicians and other telecommunications technicians to determine the phone number of a particular line. ... A technician is generally someone in a technological field who has a relatively practical understanding of the general theoretical principles of that field, e. ... A telephone number is a sequence of decimal digits that uniquely indicates the network termination point. ... Economics and commerce define an end-user as the person who uses a product. ... A telephone numbering plan is a plan for allocating telephone number ranges to countries, regions, areas and exchanges and to non-fixed telephone networks such as mobile phone networks. ...


Deactivated lines can also be maintained with no dial tone at all, while still connected to and powered by the switch, in a state sometimes called INB or Installation Busy.


See also

A DTMF telephone keypad Dual-tone multi-frequency (DTMF) signaling is used for telephone signaling over the line in the voice-frequency band to the call switching center. ... A secondary dialtone, or second dialtone, is a dialtone-like sound presented to the caller after a call has already been set up. ...

External links

  • World PSTN Tone Database - Dial tones

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