Extension (telephone system)

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The telephone connections of the individual employees or the telephones in the individual rooms are referred to as extensions in telephone systems of companies, offices, etc. Under Mobile Extension is defined as the integration of mobile phones into a telecommunications system as full extension.

Extensions are means of extension - telephone number to reach, or be of the attendant conveyed. Subscribers to extensions have an extension number, and an extension number for external extensions.

In Austria, an extension or extension is also called a flap.

In contrast, a secondary connection is a second telephone connection coupled to a telephone connection without its own telephone number.

literature

  • Hubert Zitt: ISDN & DSL for PC and telephone. Verlag Markt + Technik, Munich 2005, ISBN 3-8272-6987-3 .
  • Gisa Briese-Neumann: Make professional calls. Gabler GmbH, Wiesbaden 1996, ISBN 978-3-409-19983-4 .
  • August-Wilhelm Scheer, Markus Nüttgens (Ed.): Electronic Business Engineering. Springer Verlag, Berlin / Heidelberg 1999, ISBN 978-3-642-63683-7 .
  • Helmut Kropp: Contributions to telecommunications. Norderstedt 2015, ISBN 978-3-7347-7884-1 .
  • Volker Hammer, Ulrich Pordesch, Alexander Roßnagel: Company telephone and ISDN systems designed in accordance with the law . Springer Verlag, Berlin / Heidelberg 1993, ISBN 978-3-540-56511-6 .

Individual evidence

  1. ↑ Handbook of telecommunications technology . Private branch exchanges, 1971.