Table of Contents
Advertisement
Installation & Operation Manual
38.6.4.3
Redundant Configuration
The MTP3/M3UA application in its simplest form (as described above) is not fully
supported by the Media Gateway redundancy mechanism. Even if the Media Gateway
board is configured for Hot redundancy, the MTP3/M3UA application is not fully
recovered on a redundant Media Gateway board after the Media Gateway board
switchover/switchback takes place. The MTP3 entities go out of service and then it
takes some time (typically up to a minute) before the service is restored. All SS7
signaling is dropped and calls may be closed by the MGC/Softswitch (depending on
their configuration).
In addition, the SCTP associations are dropped during the Media Gateway board
switchover and MGC should be responsible for re-establishing the SCTP associations.
To overcome this limitation, the Redundant MTP3 Group configuration was developed.
The Redundant MTP3 Group configuration enables Hot redundancy for the
MTP3/M3UA application. In this configuration, a Signaling node is distributed across
multiple Media Gateway boards. The Signaling links can be defined on any of the
Media Gateway boards that belong to the Redundant MTP3 Group.
Note:
MTP3 Group.
When a specific Media Gateway board fails, the signaling node remains in service
via the other Media Gateway board that belongs to the same Redundant MTP3
Group.
MTP2 signaling links are restored on the redundant Media Gateway board after the
Media Gateway boards' switchover/switchback takes place – thereby the status of the
whole MTP3 subsystem is preserved.
To configure the Redundant MTP3 Group, apply the following changes to the
configuration described in 'Configuring the MTP3/M3UA Application' on page
recommended to define and bring-up a partial simple MTP3/M3UA configuration prior
to defining the full redundant MTP3 configuration):
To configure the Redundant MTP3 Group:
1.
Stop service on both Media Gateway boards (both the one that is currently
associated with specific MTP3 Group and the one to be associated with it).
a.
b.
c.
Version 6.6
Up to two Media Gateway boards can be attached to the same Redundant
Click
to access the Media Gateway status screen.
Select the Media Gateway board that is currently associated with the MTP3
Group.
Stop service on the Media Gateway board by clicking Lock in the Actions
bar.
38. Configuring the PSTN Subsystem
499
485
(It is
October 2014
Advertisement
Table of Contents
Troubleshooting
