Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Patent
1995-12-06
1999-06-08
Tsang, Fan S.
Telephonic communications
Centralized switching system
Switching controlled in response to called station...
379207, 379220, 379244, 379284, H04M 342, H04M 300
Patent
active
059109840
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to telecommunications networks and, more particularly, to fault tolerant service-providing apparatus for providing call processing services to a switching centre of a telecommunications network.
BACKGROUND OF THE INVENTION
A telecommunications network architecture is known comprising a switching system for effecting basic call processing to set up, maintain and clear calls, and service-providing means communicating with said switching system for providing services additional to said basic call processing; examples of such additional services are:
______________________________________ 3-way calling private virtual networks
call screening call blocking
call forwarding wake-up calls
call waiting Freephone/Teleinfo
televoting calling name delivery
800 number lookup speed dialing
Yellow pages plus universal personal telephone
Account card/credit card calling
number translation
network automatic call distribution
______________________________________
The switching system of such an arrangement generally treats a call as comprising two or more call portions (also known as "segments") and is operative to set-up, maintain and clear the or each such call portion. Thus where the switching system comprises more than one switching centre or point, a call will typically be treated as having an originating and terminating call portion in each switching centre; of course, even with such an arrangement, the call can be considered at a higher level as consisting of only one portion. To interface the basic call-processing functionality of the switching system with the service-providing means, the switching system is provided with interface means. These interface means enable the switching system to request service provision from the service-providing means in respect of a particular call portion, and to report to the service-providing means on progress through the process of set-up, maintenance and clearance of that call portion, and also enable said service-providing means to influence that process according to the service being provided by the service-providing means.
One such prior art telecommunications network architecture known as AIN (Advanced Intelligent Network) has been proposed by Bellcore and is described in detail in the following and other documents: Special Report SR-NPL-001623, Issue 1, June 1990, Application Protocol Interface General Requirements, Bellcore Technical Advisory. TA-NWT-001126 Issue 1, May 1991.
The description of an embodiment of present invention contained in this specification is set in the context of an AIN network and accordingly reference is directed to the above documents for details of the implementation of the overall network architecture in relation to the described embodiment of the invention. However, to facilitate an understanding of the present invention without needing to refer to the above documents, certain important aspects of an AIN network are described herein with reference to FIGS. 1 to 9, these Figures being based on those appearing in the Bellcore documents. It is to be understood that the present invention is capable of application in environments other than an AIN network, as long as the telecommunications network functions in the usual way as defined on page 1-5 of the above-identified Bellcore Technical Advisory TA-NWT-001126. That is, the telecommunications network must provide the capability to `user` entities external to the network to exchange information with other users and with the network.
For the purposes of the present introduction, a brief overview of the general AIN architecture will now be given with reference to FIG. 1 of the accompanying drawings.
In the FIG. 1 network, basic call processing (that is, call setup, maintenance and clearance) is carried out by one (or more) service switching points SSP 10 to which End Users 11 are connected. Additional services, such as those listed above, are provided, on request, to the SSP 10 either by a service control point (SCP) 12 or an Adjunct
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Bellcore Technical Advisory; TA-NWT-001126; May 1991.
IEEE International Conference On Communications, vol. 2, May 14, 1984, Amsterdam NL pp. 734-737.
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International Switching Symposium 1990, Session B8, paper #7 vol. 5, May 28, 1990, Stockholm SE pp. 171-176.
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Hoosain Allan
Tsang Fan S.
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