Version 6.6 515 October 2014
Installation & Operation Manual 38. Configuring the PSTN Subsystem
38.7.3 Online Provisioning
The configuration of the IUA/DUA application may be modified online.
See 'Configuring the IUA/DUA Application' on page 513 for the full list of entities that
must be configured and the specific parameters' description and provisioning policies.
38.7.4 ISDN Operational Status
The Operational status of the IUA/DUA application may be determined by inspecting
the Operational Status of the following entities:
Trunk – indicates status of the ISDN physical link layer
UAL Interface – for a IUA application, indicates the status of the D-channel; for a
DUA application, mirrors the status of the Trunk.
38.7.5 Redundant Configuration
The IUA/DUA application is partially supported by the Media Gateway board
redundancy mechanism. If the Media Gateway board is configured for Hot
redundancy, the IUA/DUA application goes out of service and SCTP associations are
dropped. It is the SoftSwitch's responsibility to identify this failover, re-establish SCTP
associations, re-activate ASPs and re-establish the IUA interfaces. If all the above-
mentioned events are completed prior to the expiration of the Q.931 T-309 timer,
established calls will be preserved upon Media Gateway switchover.
Note: The SCTP associations are dropped during the Media Gateway board
switchover and it is the SoftSwitch’s responsibility to re-establish them.
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