Telephonic communications – Special services
Reexamination Certificate
2001-08-27
2003-12-30
Deane, William J (Department: 2642)
Telephonic communications
Special services
C379S207010, C379S219000, C379S230000
Reexamination Certificate
active
06671361
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to a method for operating a telecommunications system containing a plurality of local exchanges in which signaling and traffic data are routed via a network service having routing code recalculation. The method is adapted to provide an integrated services digital network (ISDN) end-to-end supplementary service involving an interaction between two subscribers connected to a local exchange in which knowledge of the subscriber access code used in a called subscriber local exchange is required in the calling subscriber local exchange. The subscriber access code is generated by modification of a called subscriber routing code used by a calling subscriber local exchange. The modification occurs in a transit exchange or a service control point having a translation capability for converting the called subscriber routing code into the subscriber access code. Each local exchange has an application service element for providing the ISDN end-to-end supplementary service.
ISDN end-to-end supplementary services using end-to-end signaling, as defined in ITU-T Recs., e.g. I.253.3, do not work if number translation is required.
A completion of calls to busy subscriber (CCBS) supplementary service is one example of a subscriber service which uses end-to-end signaling, and in which the service is implemented by operations performed in both a calling subscriber local exchange and a called subscriber local exchange. Implementation of a CCBS service requires that the calling subscriber local exchange has knowledge of the called subscriber access code, as used in the called subscriber local exchange.
Completion of calls to a busy subscriber is defined in ITU-T Recommendation I.253.3.
The completion of calls to busy subscribers (CCBSs) supplementary service enables a calling user A, upon encountering a busy destination B, to be notified when the busy destination B becomes free and to have the service provider reinitiate the call to the specified destination B if user A desires. The CCBS supplementary service is applicable to users who are connected to the network via a basic access or a primary rate access. The CCBS supplementary service enables user A, upon encountering a busy destination B, to have the call completed without having to make a new call attempt when destination B becomes free. When user A requests the CCBS supplementary service, the network will monitor for destination B becoming free. When destination B becomes free, then the network will wait a short time as defined in the destination B idle guard timer in order to allow the resources to be reused for originating a call. If the resources are not reused by destination B within this time, then the network will automatically recall user A. When user A accepts the CCBS recall, then the network will automatically generate a CCBS call to destination B.
Global virtual network service (GVNS) is one example of a network service that modifies the routing code (dialed number), with the result that there is no transparency through the network for the called subscriber access code, as used in the called subscriber local exchange.
The global virtual network service is defined in ITU-T Recommendation F.16. The global virtual network service (GVNS) is a multi-network international service that provides private network functions to users at geographically dispersed international locations while minimizing the need for dedicated network resources. It may be offered to customers over the PSTN and/or ISDN. The global virtual network service is a feature-rich communications service. It provides the functions typically associated with the private networks, but utilizing the public switched network(s). The GVNS customer network configuration is defined per customer direction using customer-specific service information resident in multiple networks. The network configurations may be administered by the GVNS customer directly, the GVNS participating service provider(s) and/or the GVNS co-ordinator(s). The GVNS provides the customers with global services as a result of internetworking among the GVNS participating service providers in various countries. GVNS may accommodate this interconnection both via ISDN and non-ISDN facilities.
International Patent Disclosure WO 97/17794 describes a solution to provide CCBS over GVNS for a telecommunications system containing a plurality of local exchanges in which signaling and traffic data are routed between local exchanges via a network service having routing code recalculation. The network service includes a plurality of transit nodes, and a method to provide a supplementary subscriber service involving an interaction between two subscribers. In the method knowledge of a subscriber access code, used in a called subscriber local exchange, is required in a calling subscriber local exchange. The subscriber access code is generated by modification of a called subscriber routing code, used by the calling subscriber local exchange; and the modification occurs in a transit node of the network service.
According to International Patent Disclosure WO 97/17794 the telecommunications system is characterized in that at least some GVNS transit nodes include a relay applications service element (see International Patent Disclosure WO 97/17794,
FIG. 3
, new completion of calls to busy subscriber application service element (CCBS-ASE)) which is adapted to relay signaling data between local exchanges and which includes translation capabilities for converting a subscriber access code used at a called subscriber local exchange into a called subscriber routing code used by a calling subscriber exchange, and in that signaling data is transmitted between the calling and the called local exchanges via the relay application service element CCBS-ASE in the GVNS transit node.
For the backward direction (local exchange of the called subscriber to local exchange of the calling subscriber) the subscriber access code has to be translated into the called subscriber routing code and signaling data has to be transmitted between the called and the calling local exchanges via the relay application service element CCBS-ASE in the GVNS transit node.
In addition to the requirement of the relay application service element CCBS-ASE in the GVNS transit node the solution requires resources such as transaction IDs (transaction identifiers, see Table 1, positions 24, 25 below). In the GVNS transit node, where two sections of an the end-to-end dialog are connected, all messages being part of the dialog have to pass through the complete protocol stack (up and down) which increases the propagation delay of the messages.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a telecommunications system and a method relating to telecommunications services with number translation which overcome the above-mentioned disadvantages of the prior art devices and methods of this general type.
With the foregoing and other objects in view there is provided, in accordance with the invention, a method for operating a telecommunications system containing a plurality of local exchanges in which signaling and traffic data are routed via a network service having routing code recalculation. The method is adapted to provide an integrated services digital network (ISDN) end-to-end supplementary service involving an interaction between two subscribers each connected to a local exchange in which knowledge of a subscriber access code used in a called subscriber local exchange is required in a calling subscriber local exchange. The subscriber access code is generated by modification of a called subscriber routing code used by the calling subscriber local exchange. The modification occurs in a transit exchange or a service control point each having a translation device for converting the called subscriber routing code into the subscriber access code. Each of the local exchanges is connected to an application service element for providing the ISDN end-to-end supplementary service. T
Deane William J
Greenberg Laurence A.
Mayback Gregory L.
Siemens Schwiez AG
Stemer Werner H.
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