Avaya DECT R4 Installation And Administration Manual page 160

Installing and operating the IPBS and IPBL
A Redundant Trunk is configured as a backup to the Primary Trunk either on the IPBS Master or
Standby Master. If the Primary Trunk is Active or Up, the status of the Redundant Trunk remains
as Standby. The status of the Redundant Trunk changes to Active or Up if all the configured
Primary Trunks are Down. If the Redundant Trunk returns to Active status, the calls go through
the Redundant Trunk until at least one Primary Trunk comes back to Active status.
Figure 49: Redundant Trunk Configuration
In such scenario, a Primary Trunk to the main Communication Manager in the headquarters is
configured on the IPBS Master (and Standby Master). These trunks are used as long as
communication with the Communication Manager in the Headquarter is possible. The
Redundant Trunk on the IPBS Master (and Standby Master) is in Standby status.
In case of an outage of the main Communication Manager or a broken WAN connection, the
Primary Trunk on the IPBS Master (and Standby Master) will go to status Down and the
Redundant Trunk on the IPBS Master will go to Active mode. On the Standby Master, the
Redundant Trunk will come to status Up. Now the communication with the LSP will be done
through the active Redundant Trunk.
Switching back to Primary Trunks
When Redundant Trunks are active and at least one Primary Trunk is in the Up mode, you can
go back to the Primary Trunks using either the Manual or the Automatic mode.
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Avaya DECT R4 - Installation and Maintenance Guide 02/2016