Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-11-12
1998-11-17
Wolfe, Willis R.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455418, 455461, 455445, 455561, 379201, H04Q 726, H04M 338
Patent
active
058390677
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a novel communications system comprising a local network including a private automatic branch exchange PABX to which there is connected a number of access units such as cordless telephones or conventional fixed telephone sets. The individual users of the access units are given wide area mobility by providing the users with corporate mobile telephones and by connecting a service node, referred to as a mobility server, to the PABX.
The mobility server is an adjunct to the PABX and manages the additional functions which are required to serve the corporate mobile telephones. Said additional functions may be integrated in the PABX by modifying the existing software programs controlling the PABX. In the following the expression of mobility server may therefore refer either to functionality present in the mobility server or in the PABX.
The mobility server interacts with the PABX in a manner to strictly control calls to and from the users in a uniform way irrespective of the type of terminal, be it a conventional fixed telephone, a cordless telephone or a mobile telephone, used in a call. The operator of the local network allots each user in the local network an individual service profile. The service profile defines the services available to an individual user and may vary from user to user.
The local network operator is often a company, although other operators, such as security organizations, fire-brigades, police corps, property organizations like condominium apartment organizations are conceivable. The organization will thus be able to provide its members with the inventive services.
In the following the invention will be described with reference to its application in a company although it should be understood that the invention equally well is applicable to any other organization served by a local network.
BACKGROUND ART
When a company today provides its employees with mobile telephones the company has to buy a corresponding number of mobile telephone subscriptions of a mobile telephone network operator. The company has no control of the way in which its employees use their corporate mobile telephones. A mobile telephone user may place private local as well as long distance calls using the services provided by the network operator. Not until the company receives the bill from the network operator such unauthorized use of the mobile telephone is revealed. Accordingly, the company has a restrictive policy in giving out mobile telephones to its employees.
A mobile telephone operator, however, has an interest in encouraging the use of as many mobile telephones as possible in the mobile telephone network.
Other employees of the above company have access units, such as office telephones and cordless telephones, which are connected to a private automatic branch exchange PABX. The PABX can be programmed to control the service available at an access unit. As an example inter PABX calls, i.e. calls from one extension to another can be placed without any restrictions. Outgoing PABX-external calls, i.a. calls having a destination other than a PABX-internal extension, are controlled by the PABX and therefore by the company. As an example a company may program its PABX to bar long distance calls, calls to premium rate numbers (a premium rate number is associated with a service which is delivered via a telephone and for which payment is due), calls outside a local area. Many other examples of programmed restrictions are possible. Consider the following situation: When an employee having an office telephone set at her/his office the desk, or having a cordless telephone of restricted area coverage, leaves the company premises, for example in order to carry out a company service, the employee is no longer accessible. Sometimes it might be desirable to access a person of this category. This situation might not occur very often, but nevertheless occasionally it might be of utmost importance to be able to establish contact with such a person when she/he is outside the company site.
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Telefonaktiebolaget LM Ericsson
Vo Hieu T.
Wolfe Willis R.
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