Patent ID: 6671361
Filing Date: 2003-12-30
Classification: H04M,H04Q

Abstract:
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 being 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 being generated by modification of a called subscriber routing code used by the calling subscriber local exchange, the modification occurs in one of a transit exchange and 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 connected to an application service element for providing the ISDN end-to-end supplementary service, the method which comprises the steps of:providing the local exchanges supporting the ISDN end-to-end supplementary service with a trigger mechanism for triggering and forwarding a query to the translation device whenever the ISDN end-to-end supplementary service is requested and when the called subscriber routing code is detected; and forwarding the subscriber access code thus returned from the translation device to the application service element, which, based on a received subscriber access code, will establish one and only one end-to-end dialogue with an associated counterpart at the called subscriber local exchange and provide the ISDN end-to-end supplementary service.