Telecommunications system and method relating to telecommunications services with number translation

• US 20020075905A1
• Filed: 08/27/2001
• Published: 06/20/2002
• Est. Priority Date: 02/25/1999
• Status: Active Grant

• Current Assignee: Siemens Schweiz AG (Siemens AG)
• Original Assignee: Siemens Schweiz AG (Siemens AG)
• Inventors: Goldstein, Peter
• Granted Patent: US 6,671,361 B2
• Time in Patent Office: Days
• US Class Current: 370/522
• CPC Class Codes: H04M 3/48 Arrangements for recalling a calling subscriber when the wanted subscriber ceases to be busy
• CPC Class Codes: H04Q 3/0029 Provisions for intelligent networking

Abstract

A telecommunications system containing a plurality of local and transit exchanges in which signaling and traffic data are routed between remote exchanges via a network service having routing code recalculation is described. The system is adapted to provide an ISDN end-to-end supplementary service between two subscribers in which a subscriber access code is generated by modification of a called subscriber routing code, used by the calling subscriber local exchange. The local exchanges that have an applications service element for providing the ISDN supplementary service, include a mechanism to trigger a query, which is sent to a translation device whenever the supplementary service is requested and a subscriber routing code is detected. The subscriber access code returned from the translation device is forwarded to the applications service element, which, will establish an end-to-end dialogue with it'"'"'s counterpart at the called subscriber local exchange and provide the ISDN supplementary service.

Claims

1. 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.

2. The method according to claim 1, which comprises basing the translation device on a global virtual network service (GVNS) function located in one of a transit exchange and in a service control point and during the forwarding step the subscriber access code depending from the called subscriber routing code is taken from a database.

3. The method according to claim 1, which comprises:

locating the trigger mechanism in a call control function of the calling subscriber local exchange; and

storing the called subscriber routing code in a memory location of the call control function assigned to the local exchange from which a call was originated is replaced by the subscriber access code and stored in the memory location.

4. The method according to claim 3, which comprises providing the translation device in the service control point and there is a service switching function contained in the local exchange and during the forwarding step the local exchange acts temporarily as the service switching point.

5. 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, which comprises the steps of:

generating a subscriber access code by modification of a called subscriber routing code used by a calling subscriber local exchange, knowledge of the subscriber access code used in a called subscriber local exchange is required in the calling subscriber local exchange;

performing the modification 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;

providing each of the local exchanges to be connected to an application service element for providing the ISDN end-to-end supplementary service, the local exchanges supporting the ISDN end-to-end supplementary service include 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 a 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.