MTP3 Support for Multiple Originating Point Codes

Introduction

Message Transfer Part Level 3 (MTP3) provides message routing between signaling points in the SS7 network. MTP3 routes messages based on the routing label in the signaling information field (SIF) of message signal units. The routing label is comprised of the destination point code (DPC), originating point code (OPC), and signaling link selection (SLS) field.

Dialogic NaturalAccess™ Signaling Software version 5.x and later includes MTP3 support for multiple originating point codes (OPCs) links, link sets, and routes. When an OPC is not specifically configured, it will default to a general OPC.

Configuration

The user can configure whether routing is done by OPC and DPC or by DPC only (as it was prior to version 4.0) using the following configuration keyword:

OPC_ROUTING TRUE / FALSE (default)

Example Configuration

Open

As an example, for the configuration in the diagram above, the GENERAL section of MTP3 configuration file will include:

POINT_CODE 1.1.1 OPC_ROUTING TRUE

LINKS section will include

LINK 0 LINK_SET 1 ADJACENT_DPC 3.3.3 LINK 1 LINK_SET 1 ADJACENT_DPC 3.3.3 LINK 2 LINK_SET 2 ADJACENT_DPC 4.4.4 OPC 2.2.2 LINK 3 LINK_SET 2 ADJACENT_DPC 4.4.4 OPC 2.2.2

LINKSETS section will include

LINKSET 1 ADJACENT_DPC 3.3.3 OPC 1.1.1 LINKSET 2 ADJACENT_DPC 4.4.4 OPC 2.2.2

And ROUTES section will include

ROUTE 0 DPC 1.1.1 DIRECTION UP ROUTE 1 DPC 2.2.2 DIRECTION UP ROUTE 2 DPC 3.3.3 ROUTE 3 DPC 4.4.4 ROUTE 4 DPC 5.5.5 ROUTE 5 DPC 5.5.5 OPC 2.2.2