IP Centrex

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IP-Centrex describes the adoption of the Centrex principle in IP telephony and means the provision of the functions of a telephone system by a provider in the public network.

Mode of action

The basis of IP-Centrex are both the functions of a telephone system, as they are typically provided for a private communication group, and the operating principle of IP telephony. In classic telecommunications, these groups are still almost exclusively made up of telephone systems. Telephone systems can provide a number of performance features that enable more intensive communication relationships between the connected subscribers than is the case in the public network. This includes group functions such as an internal number plan, the forwarding of calls and the shared use of additional devices such as internal telephone books. A telephone system is no longer absolutely necessary for IP telephony. The connections between the participants themselves are established using the procedures of the IP networks; that is, the connected subscribers are connected to one another on the basis of specified routing tables and do not have to manage their connections via a central entity in the network in the form of an exchange . For this reason, it does not matter in a private communication group whether the control commands required for the connections come from a system within the user's network or are provided by a provider in the public network with IP-Centrex.

Advantages and disadvantages

  • No own systems required by the user.
  • No capacity bottlenecks when using public networks.
  • Integration of mobile participants.
  • Limited influence of the user on the system.
  • Easy adjustment of the number of devices.

development

IP-Centrex is offered in almost all industrialized countries. The pioneers are the USA and Japan, where for 2010 a share of fifty percent of the installed extensions for IP-Centrex is estimated. In Europe, the growth countries of Eastern Europe are the pioneers, as there is only a small number of conventional telephone systems and new users often use IP-Centrex.

literature

  • John R. Abrahams, Mauro Lollo: Centrex Or PBX. The Impact of IP, ARTECH HOUSE INC, Norwood 2003, ISBN 1-58053-497-X .
  • Richard Swale (Ed.): Voice Over IP (Internet Protocol). Systems and Solutions, Texact Technologies, London 2001, ISBN 978-085296-024-0 .
  • International Engineering Consortium: Business Models and Drivers for Next-Generation IMS Services. Chicago Illinois 2007, ISBN 978-1-931695-55-8 .

Web links