Dialogic IMG - How to configure SS7 redundancy on a Dialogic Integrated Media Gateway (IMG)
Prerequisites
The reader should be familiar with the structure of SS7 networks, SS7 protocols and SS7 terminology.
This article also assumes that the reader is familiar with configuration of a Dialogic IMG Integrated Media Gateway ("IMG").
Before starting this procedure, you must complete the following:
1. Configure the Logical IMG with two or more Physical IMGs. All IMGs with SS7 CICs controlled by the same stack must be in the same logical group.
2. Configure the TDM spans in the IMGs to be used for the Primary and Secondary SS7 signaling.
Note: All SS7 signaling configuration is done on the primary SS7 IMG.
Procedure
1. Configure SS7 redundancy
2. The SS7 Stack, Linkset, and route configuration are the same as defined for either the A-Link or F-Link configurations.
3. Configure the SS7 link on the Primary IMG
a) Set the Primary/Secondary option to Primary. For the Interface – Offset ClientView will display the list of available spans configured on the Primary IMG.
b) Interface – Offset. Select the T1 or E1 span to be used for the SS7 link.
c) ClientView will automatically set the link ID to the first available from 0-63
4. Configure the SS7 link on the Secondary IMG
a) Set the Primary/Secondary option to Secondary. For the Interface – Offset ClientView will display the list of available
spans configured on the Secondary IMG.
b) Interface – Offset. Select the T1 or E1 span to be used for the SS7 link.
c) For links on the secondary IMG ClientView will automatically set the link ID to the first available from 64-127
Glossary of Acronyms / Terms
Service Switching Points (SSPs)
• SSPs are PSTN switches that originate or terminate calls, or route calls to other switches (tandem switches)
• SSPs exchange SS7 messages to set up, manage and release voice circuits
Service Control Points (SCPs)
• SCPs are database servers that respond to requests from SSPs for call routing information
Signal Transfer Points (STPs)
• STPs are packet switches that serve as routers in the SS7 network
• Incoming SS7 messages are switched to outgoing links based on routing information contained in the messages (not just based on the destination numbers)
A Link:
• An A (Access) link connects a signaling end point (e.g., an SCP or SSP) to an STP.
F Link:
• An F (fully associated) link connects two signaling end point (SSPs).
OPC - Originating Point Code
DPC - Destination Point Code
APC - Adjacent Point Code