Methods and systems for routing messages between a mated pair of routing nodes with a distributed processing architecture and one or more redundantly connected remote applications

• US 7,197,036 B2
• Filed: 02/27/2003
• Issued: 03/27/2007
• Est. Priority Date: 08/16/2001
• Status: Expired due to Term

• Current Assignee: Tekelec Global, Inc. (Oracle Corporation)
• Original Assignee: Tekelec
• Inventors: Craig, Jeffrey Alan
• Primary Examiner(s): Vu; Huy D.
• Assistant Examiner(s): NG, CHRISTINE Y
• Application Number:
  US10/376,001
• Publication Number:
  US 20030169779A1
• Time in Patent Office: 1,489 Days
• Field of Search: 370/352, 370/389, 370/392, 370/401, 370/410, 370/522
• US Class Current: 370/392
• CPC Class Codes: H04L 45/28 using route fault recovery
• CPC Class Codes: H04L 45/583 Stackable routers
• CPC Class Codes: H04L 45/60 Router architectures
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/169 Special adaptations of TCP, UDP or IP for interworking of IP based networks with other networks protocols for interworking, protocol conversion H04L69/08
• CPC Class Codes: H04Q 3/0025 Provisions for signalling
• CPC Class Codes: H04Q 3/0045 involving hybrid, i.e. a mixture of public and private, or multi-vendor systems
• CPC Class Codes: H04W 40/00 Communication routing or communication path finding

Abstract

Methods and systems for routing messages between a mated pair of routing nodes with a distributed processing architecture and one or more redundantly connected remote applications are disclosed. A mated pair of routing nodes uses private point codes to distribute messages destined for remote applications among internal processing modules and between the routing nodes. The routing nodes replace the private point codes with a shared point code before sending the messages to one of the remote applications. When communicating with external PSTN nodes, the mated pair of routing nodes uses the shared point code.

Claims

1. A method for routing messages between a mated pair of routing nodes having a distributed internal processing architecture and one or more redundantly connected remote applications, the method comprising:

(a) receiving a signaling message at a first communications module in a first routing node of a mated pair of routing nodes, the mated pair of routing nodes being redundantly connected to one or more remote applications, the signaling message being addressed to a first point code shared by the mated pair of routing nodes and the one or more remote applications;

(b) determining, based on information in the signaling message, whether to forward the message to one of the remote applications or to a second routing node of the mated pair of routing nodes;

(c) in response to determining to forward the message to one of the remote applications, replacing the first point code with a second point code used internally by the first and second routing nodes to identify the remote application and distributing the message to a second communications module within the first routing node using the second point code, the second communications module being associated with the remote application; and

(d) in response to determining to forward the message to the second routing node, replacing the first point code with a third point code used internally by the first routing node to identify the second routing node and distributing the signaling message to a third communications module within the first routing node based on the third point code, the third communicatidns module being associated with the second routing node.

2. The method of claim 1 wherein receiving a signaling message includes receiving an SS7 signaling message at an SS7 link interface module.

3. The method of claim 1 wherein receiving a signaling message includes receiving an IP-encapsulated SS7 signaling message at a data communications module.

4. The method of claim 1 wherein determining whether to forward the message to one of the remote applications or to a second routing node of the mated pair of routing nodes includes performing a lookup in a remote application table based on a destination point code in the signaling message and one or more additional parameters in the signaling message.

5. The method of claim 4 wherein the additional parameters in the signaling message include a service indicator.

6. The method of claim 1 wherein distributing the signaling message to a second communications module within the first routing node based on the second point code includes performing a lookup in an MTP routing table located on the first communications module to locate a bus address of the second communications module based on the second point code.

7. The method of claim 1 wherein distributing the signaling message to a third communications module within the first routing node based on the third point code includes performing a lookup in an MTP routing table on the first communications module using the third point code as a key and determining a bus address of the third communications module based on the third point code.

8. The method of claim 1 comprising, at the second communications module, and, prior to forwarding the message to the remote application, replacing the second point code with the first point code.

9. The method of claim 1 comprising, at the third communications module, and, prior to forwarding the message to the second routing node, inserting a fourth point code in an originating point code field in the signaling message to identify the first routing node as the message originator to the second routing node.

10. The method of claim 1 comprising determining that the message should not be forwarded to the remote application or to the second routing node of the mated pair of routing nodes, and in response, forwarding the signaling message to a fourth communications module associated with a public switched telephone network (PSTN) node.

11. A method for utilizing message transfer part (MTP) routing to communicate messages between routing nodes of a mated pair of routing nodes and a remote application that share a point code, the method comprising:

(a) communicating with nodes in a public switched telephone network (PSTN) using a first point code shared by a mated pair of routing nodes and a remote application;

(b) communicating messages between routing nodes of the mated pair of routing nodes using second and third point codes used by the routing nodes to identify each other;

(c) communicating messages intended for the remote application between the routing nodes using a fourth point code utilized internally by the routing nodes to identify the remote application; and

(d) identifying messages from the nodes in the PSTN addressed to the first point code as being intended for the remote application using a parameter in each of the signaling messages in combination with the first point code.

12. The method of claim 11 wherein communicating messages between the routing nodes using second and third point codes includes replacing a point code value in an originating point code (OPC) field of a message to be transmitted from the first routing node to the second routing node with the second point code and replacing a point code value in an OPC field of a message to be transmitted from the second routing node to the first routing node with the third point code.

13. The method of claim 11 wherein communicating messages between the routing nodes using the fourth point code includes replacing point code values in destination point code (DPC) fields of messages intended for the remote application with the fourth point code.

14. The method of claim 11 wherein the first point code comprises a public point code and the second, third and fourth point codes comprise private point codes.

15. The method of claim 11 wherein the routing nodes are coupled to a plurality of remote applications and wherein the method further comprises communicating messages intended for the remote applications between the routing nodes using a unique internal point code for each remote application.

16. The method of claim 11 wherein step (b) includes communicating network management messages between the routing nodes using the second and third point codes in the OPO and DPC fields of the network management messages and using the fourth point code to identify the remote application in network management messages concerning the remote application.

17. The method of claim 11 comprising replacing the first point code in the messages identified as being intended for the remote application with the fourth point code and using the fourth point code to distribute the messages intended for the remote application between processing modules in the routing nodes.

18. A method for utilizing message transfer part (MTP) routing to communicate messages between routing nodes of a mated pair of routing nodes and a remote application that share a point code, the method comprising:

(a) communicating with nodes in a public switched telephone network (PSTN) using a first point code shared by a mated pair of routing nodes and a remote application;

(b) communicating messages between routing nodes of the mated pair of routing nodes using second and third point codes used by the routing nodes to identify each other; and

(c) communicating messages intended for the remote application between the routing nodes using a fourth point code utilized internally by the routing nodes to identify the remote application, wherein communicating with nodes in the PSTN using the first point code includes replacing originating point code values in messages destined for the PSTN with the first point code.

19. A method for utilizing message transfer part (MTP) routing to communicate messages between routing nodes of a mated pair of routing nodes and a remote application that share a point code, the method comprising:

(a) communicating with nodes in a public switched telephone network (PSTN) using a first point code shared by a mated pair of routing nodes and a remote application;

(b) communicating messages between routing nodes of the mated pair of routing nodes using second and third point codes used by the routing nodes to identify each other;

(c) communicating messages intended for the remote application between the routing nodes using a fourth point code utilized internally by the routing nodes to identify the remote application, wherein said communicating messages intended for the remote application between the routing nodes using the fourth point code includes replacing point code values in destination point code (DPC) fields of messages intended for the remote application with the fourth point code, and

(d) replacing the fourth point code values in the DPC fields of the messages intended for the remote application with the first point code before sending the messages to the remote application.

20. A system including pair of routing nodes having signal transfer point (STP) functionality and remote application support functionality, the system comprising:

(a) a first routing node capable of operating in a first mode for performing normal STP functions and a second mode for providing remote application support; and

(b) a second routing node for functioning in the first mode for performing normal STP functions, and in the second mode for providing remote application support, wherein the first and second routing nodes are adapted to switch between the first and second modes of operation based on the origins of received signaling messages, wherein switching between the first and second modes of operation includes operating in the first mode in response to receiving a signaling message from a first public switched telephone network (PSTN) and operating in the second mode in response to receiving a signaling message from a second PSTN.

21. The system of claim 20 wherein the first and second routing nodes each include a distributed internal processing architecture and the first and second routing nodes are adapted to distribute messages internally among processing modules using a public point code and multiple private point codes.

22. The system of claim 20 wherein the first and second routing nodes are adapted to associate a plurality of different private point codes with a plurality of different remote applications.

23. The system of claim 20 wherein operating in the first mode includes performing MTP routing of messages based on public SS7 point codes.

24. The system of claim 20 wherein providing remote application support includes using MTP routing and private point code replacement to distribute messages between the routing nodes.

25. A system including pair of routing nodes having signal transfer point (STP) functionality and remote application support functionality, the system comprising:

(a) a first routing node capable of operating in a first mode for performing normal STP functions and a second mode for providing remote application support; and

(b) a second routing node for functioning in the first mode for performing normal STP functions, and in the second mode for providing remote application support, wherein the first and second routing nodes are adapted to switch between the first and second modes of operation based on the origins of received signaling messages,

wherein operating in the first mode includes performing MTP routing of messages based on public SS7 point codes contained in destination point code (DPC) fields of the messages without replacing the point code values in the DPC fields with private point codes.

26. A remote application support system for supporting multiple remote applications using multiple internal point codes, the system comprising:

(a) a first routing node for communicating with a first network using a first public point code and for internally distributing messages between processing modules in the first routing node intended for a plurality of remote applications and using a plurality of different private point codes; and

(b) a second routing node coupled to the first routing node, the second routing node being configured to communicate with the first network using the first point code and to internally distribute messages intended for the remote applications between processing modules in the second routing node using the private point codes,

wherein the first routing node, the second routing node and the plurality of remote applications all have, as an address in the first network, the first public point code.

27. The system of claim 26 wherein the first and second routing nodes each include a distributed internal processing architecture having a plurality of link interface modules connected via a bus.

28. The system of claim 27 wherein the first and second routing nodes are configured to use the private point codes to distribute messages between the link interface modules.

29. The system of claim 27 wherein the plurality of link interface modules includes first link interface modules in the first and second routing nodes for communicating with the first network, second link interface modules for communicating messages between the first and second routing nodes, and third link interface modules for communicating with the remote applications.

30. The system of claim 26 wherein the first and second routing nodes are configured to communicate network management messages between each other concerning the remote applications using the private point codes to identify the remote applications.

31. A remote application support system for supporting multiple remote applications using multiple internal point codes, the system comprising:

(a) a first routing node for communicating with a first network using a first public point code and for internally distributing messages intended for a plurality of remote applications and using a plurality of different private point codes; and

(b) a second routing node coupled to the first routing node, the second routing node being configured to communicate with the first network using the first point code and to internally distribute messages intended for the remote applications using the private point codes;

wherein;

the first routing node, the second routing node and the plurality of remote applications all have, as an address in the first network, the first public point code,

the first and second routing nodes each include a distributed internal processing architecture having a plurality of link interface modules connected via a bus;

the plurality of link interface modules includes first link interface modules in the first and second routing nodes for communicating with the first network, second link interface modules for communicating messages between the first and second routing nodes, and third link interface modules for communicating with the remote applications; and

the first link interface modules each include a transmit filter for preventing messages having the private point codes from being sent to the first network, the second link interface modules each include a transmit filter for replacing originating point code (OPC) values in messages communicated between the first and second routing nodes with private point codes, and the third link interface modules each include a transmit filter for replacing destination point code (DPC) values in messages destined for the remote applications with the first point code.