In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom. Such extension phones allow making or receiving calls in different rooms, for example in a home, but any incoming call would ring all extensions and any one extension being in use would cause the line to be busy for all users. Some telephones intended for use as extensions have built in intercom features; a key telephone system for a small business may offer two to five lines, lamps indicating lines already in use, the ability to place calls on 'hold' and an intercom on each of the multiple extensions.
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| - Nebenstelle (Telefonanlage) (de)
- Extension (telephone) (en)
- 内線電話 (ja)
- Ramal telefônico (pt)
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| - 内線電話（ないせんでんわ）とは、組織内専用の電話番号で通話できる電話網である。公衆交換電話網と相互接続されているのが一般的である。有線電気通信法では、電気通信事業者以外が設置するものを私設電話と呼ぶ。 大規模な企業では、電気通信事業者から専用線を借り構内交換機を設置したり、仮想内線網サービスを契約したりして、内線電話網を構築している。 小規模な事業所では、ビジネスフォン・多機能ボタン電話システムまたはキーテレホンと呼ばれる、小規模内線電話システムが導入されている場合が多い。交換機能を担う主装置と複数の端末のセットでシステムを構成する。 (ja)
- Ramal, em uma rede telefônica privada (PABX), refere-se a qualquer ramo de uma rede deste tipo. O nome é devido a analogia com uma árvore: a ligação chega à central por um tronco (a linha telefônica oferecida pela operadora local), e dali é direcionada aos ramos - ou ramais - que funcionam como linhas telefônicas internas no ambiente atendido pela central, sendo uma de suas vantagens a rapidez na transmissão de um telefonema para um setor desejado de um estabelecimento. (pt)
- Als Nebenstellen werden bei Telefonanlagen von Unternehmen, Ämtern usw. die Telefonanschlüsse der einzelnen Mitarbeiter bezeichnet, bzw. die Telefonapparate in den einzelnen Räumen. Unter Mobile-Extension versteht man die Integration von Mobiltelefonen in eine Telekommunikationsanlage als vollwertige Nebenstelle. Nebenstellen sind mittels Durchwahl-Telefonnummer zu erreichen, bzw. werden von der Telefonzentrale vermittelt. Teilnehmer an Nebenstellen haben eine Nebenstellennummer (extension number), bei Durchwahl von außen eine Durchwahlnummer. (de)
- In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom. Such extension phones allow making or receiving calls in different rooms, for example in a home, but any incoming call would ring all extensions and any one extension being in use would cause the line to be busy for all users. Some telephones intended for use as extensions have built in intercom features; a key telephone system for a small business may offer two to five lines, lamps indicating lines already in use, the ability to place calls on 'hold' and an intercom on each of the multiple extensions. (en)
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| - Als Nebenstellen werden bei Telefonanlagen von Unternehmen, Ämtern usw. die Telefonanschlüsse der einzelnen Mitarbeiter bezeichnet, bzw. die Telefonapparate in den einzelnen Räumen. Unter Mobile-Extension versteht man die Integration von Mobiltelefonen in eine Telekommunikationsanlage als vollwertige Nebenstelle. Nebenstellen sind mittels Durchwahl-Telefonnummer zu erreichen, bzw. werden von der Telefonzentrale vermittelt. Teilnehmer an Nebenstellen haben eine Nebenstellennummer (extension number), bei Durchwahl von außen eine Durchwahlnummer. In Österreich bezeichnet man eine Nebenstelle bzw. die Durchwahl auch als Klappe. Als Nebenanschluss wird demgegenüber ein an einen Fernsprechanschluss gekoppelter zweiter Telefonanschluss ohne eigene Telefonnummer bezeichnet. (de)
- In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom. Such extension phones allow making or receiving calls in different rooms, for example in a home, but any incoming call would ring all extensions and any one extension being in use would cause the line to be busy for all users. Some telephones intended for use as extensions have built in intercom features; a key telephone system for a small business may offer two to five lines, lamps indicating lines already in use, the ability to place calls on 'hold' and an intercom on each of the multiple extensions. In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a separate outside line. In these systems, one usually has to dial a number (typically 9 in North America, 0 in Europe) to tell the PBX to connect with an outside landline (also called DDCO, or Direct Dial Central Office) to dial an external number. Within the PBX, the user merely dials the extension number to reach any other user directly. For inbound calls, a switchboard operator or automated attendant may request the number of the desired extension or the call may be completed with direct inbound dialing, if outside numbers are assigned to individual extensions. An off-premises extension, where a worker at a remote location employs a telephone configured to appear as if it were an extension located at the main business site, may be created in analog telephony by using a leased line to connect the extension to the main enterprise system. Voice over IP makes the creation of off-premises extensions inexpensive and trivial as broadband Internet and virtual private networking can extend local network access anywhere in the world. In either system, an off-premises extension is reachable from within the same enterprise simply by calling its extension number directly; for inbound and outgoing calls, it functions as if it were located at the main place of business. (en)
- 内線電話（ないせんでんわ）とは、組織内専用の電話番号で通話できる電話網である。公衆交換電話網と相互接続されているのが一般的である。有線電気通信法では、電気通信事業者以外が設置するものを私設電話と呼ぶ。 大規模な企業では、電気通信事業者から専用線を借り構内交換機を設置したり、仮想内線網サービスを契約したりして、内線電話網を構築している。 小規模な事業所では、ビジネスフォン・多機能ボタン電話システムまたはキーテレホンと呼ばれる、小規模内線電話システムが導入されている場合が多い。交換機能を担う主装置と複数の端末のセットでシステムを構成する。 (ja)
- Ramal, em uma rede telefônica privada (PABX), refere-se a qualquer ramo de uma rede deste tipo. O nome é devido a analogia com uma árvore: a ligação chega à central por um tronco (a linha telefônica oferecida pela operadora local), e dali é direcionada aos ramos - ou ramais - que funcionam como linhas telefônicas internas no ambiente atendido pela central, sendo uma de suas vantagens a rapidez na transmissão de um telefonema para um setor desejado de um estabelecimento. (pt)
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