System for converting a routing address within a telecommunications network

• US 5,838,782 A
• Filed: 05/24/1996
• Issued: 11/17/1998
• Est. Priority Date: 05/24/1996
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Lindquist, Jan E.
• Primary Examiner(s): Hong, Harry S.
• Application Number:
  US08/653,266
• Time in Patent Office: 907 Days
• Field of Search: 379/34, 379/207, 379/219, 379/220, 379/221, 379/229, 379/230, 370/401, 370/466, 370/467
• US Class Current: 379/221.1
• CPC Class Codes: H04Q 3/0025 Provisions for signalling

Abstract

A point code and subsystem number (PC/SSN) representing a first application layer node within a first Signaling System No. 7 (SS7) network is not defined within a second SS7 network. While transmitting a first signal from the first node to a second node within the second SS7 network, the PC/SSN representing the first node is utilized as the calling party address (Cgpa). A converter signal transfer point (STP) interfacing the first SS7 network with the second SS7 network intercepts the transmitted signal, converts the specified PC/SSN to a corresponding global title number. The first signal containing the converted Cgpa is then forwarded to the second node. Whenever the second node within the second SS7 network transmits a return signal back to the first node, the converted Cgpa is then used as the called party address (Cdpa). The converter STP once again intercepts the return address and converts the intercepted global title number back to the original PC/SSN value. The return signal with the converted Cdpa is then routed back to the first node.

Claims

1. A method for communicating a signal between a first node within a first Signaling System No. 7 (SS7) network and a second node within a second SS7 network, wherein said first SS7 network and said second SS7 network are connected by a converter signal transfer point (STP), and wherein said signal includes a point code and subsystem number representing said first node as a calling party address, wherein said point code and subsystem number are routeable within said first SS7 network but not routeable within said second SS7 network, said method comprising the steps of:

receiving said signal from said first node by said converter signal transfer point (STP), said signal including said point code and subsystem number representing said first node as said calling party address (Cgpa);

converting said received point code and subsystem number into a global title number routeable within said second telecommunications network by said converter STP, and replacing said global title number in said signal as said calling party address, wherein said global title number represents said converter STP; and

transmitting said signal from said converter STP towards said second node over said second SS7 network.

2. The method of claim 1 wherein said converter STP comprises an international gateway STP.

3. The method of claim 1 further comprising the step of storing said point code and subsystem number representing said first node in a memory attached to said converter STP.

4. The method of claim 1 further comprising the steps of:

receiving a return signal by said converter STP sent from said second node in response to said signal, said return signal transported over said second SS7 network using said global title number as a called party address;

converting said global title number into said point code and subsystem number representing said first node and replacing said point code and subsystem number as said called party address; and

transmitting said return signal from said converter STP towards said first node over said first SS7 network.

5. The method of claim 4 wherein said step of converting further comprises the step of retrieving said point code and subsystem number representing said first node from a memory.

6. The method of claim 1 wherein said signal comprises a plurality of parameters and wherein said step of transmitting said signal further comprises the step of encapsulating said received point code and subsystem number within one of said plurality of parameters not being used by said second SS7 network.

7. The method of claim 6 further comprising the steps of:

receiving a return signal by said converter STP sent from said second node, said return signal transported over said second SS7 network using said global title number as a called party address and wherein said return signal further encapsulates said point code and subsystem number;

extracting said encapsulated point code and subsystem number from said return signal by said converter STP; and

transmitting said return signal from said converter STP towards said first node over said first SS7 network using said extracted point code and subsystem number as said called party address.

8. A system for communicating a signal containing application layer data between a first node within a first signaling system No. 7 (SS7) network and a second node within a second SS7 network, wherein said signal includes a point code and subsystem number representing said first node as a Calling Party Address, wherein said point code and subsystem number are defined within said first SS7 network and wherein said point code and subsystem number are not defined within said second SS7 network, said system comprising:

a converter signal transfer point (STP) connecting said first SS7 network with said second SS7 network, said converter STP comprising;

a Signaling Connection Control Part (SCCP) layer module for receiving said signal from said first SS7 network; and

a conversion module interfaced with said SCCP layer module, said conversion module converting said point code and subsystem number within said received signal to a global title number routeable by said second SS7 network, said global title number representing said converter STP.

9. The system of claim 8 further comprising a memory table for storing possible point code and subsystem numbers within said first SS7 network with corresponding global title numbers.

10. The system of claim 9

wherein said SCCP module receives a return signal from said second node, said return signal routed over said second SS7 network using said global title number as a called party address;

wherein said conversion module converts said global title number into said point code and subsystem number previously received within said signal; and

wherein said SCCP module transmits said return signal to said first node over said first SS7 network using said converted point code and subsystem number as said called party address.

11. The system of claim 8 further comprising a memory table for storing said point code subsystem number representing said first node.

12. The system of claim 11 wherein said SCCP module receives a return signal from said second node, said return signal routed over said second SS7 network using said global title number as a called party address;

wherein said conversion module retrieves said point code and subsystem number representing said first node from said memory table; and

wherein said SCCP module transmits said return signal to said first node over said SS7 network using said retrieved point code and subsystem number as said called party address.

13. The system of claim 8 wherein said signal comprises a plurality of parameters and said converter STP further comprises means for encapsulating said point code and subsystem number into one of said plurality of parameters not being used by said second SS7 network.

14. The system of claim 13

wherein said SCCP layer module receives a return signal from said second node, said return signal routed over said second SS7 network using said global title number as a called party address and further encapsulates said point code and subsystem number;

wherein said conversion module extracts said encapsulated point code and subsystem number from said return signal; and

wherein said SCCP layer module transmits said return signal towards said first node using said extracted point code and subsystem number as said called party number.

15. A system for communicating a signal between a first node within a first Signaling System No. 7 (SS7) network to a second node within a second SS7 network, wherein said first node is identified by a point code and subsystem number and wherein said first SS7 network is capable of routing said signal utilizing said point code and subsystem number and wherein said second SS7 said point code and subsystem number, said system comprising:

a converter Signal Transfer Point connecting said first SS7 network to said second SS7 network, said converter STP comprising;

means for receiving a signal from said first node, said signal including said point code and subsystem number representing said first node as a calling party address;

means for converting said point code and subsystem number into a global title number representing said converter STP; and

means for transmitting said signal to said second node over said second SS7 network.

16. The system of claim 15 wherein said converter STP comprises an international gateway STP.

17. The system of claim 15 wherein said converter STP further comprises a memory for storing said point code and subsystem number representing said first node.

18. The system of claim 15 wherein said converter STP further comprises:

means for receiving a return signal from said second node, said return signal routed over said second SS7 network using said global title number as a called party address;

means for converting said global title number back into said point code and subsystem number previously received within said signal; and

means for transmitting said return signal to said first node over said first SS7 network using said point code and subsystem number as said called party address.

19. The system of claim 18 wherein said converter STP further comprises means for retrieving said point code and subsystem number previously received within said signal from a memory.

20. The system of claim 15 wherein said signal comprise a plurality of parameters and said converter STP further comprising means for encapsulating said received point code and subsystem number within one said plurality of parameters not being used by said second SS7 network.

21. The system of claim 20 wherein said converter STP further comprises:

means for receiving a return signal from said second node, said return signal transported over said second SS7 network using said global title number as a called party address and wherein said return signal further encapsulates said point code and subsystem number;

means for extracting said encapsulated point code and subsystem number from said return signal; and

means for transmitting said return signal to said first node over said first SS7 network using said extracted point code and subsystem number as said called party address.