Active Standby - HARC.
Active Standby, also known as HARC (High Availability Replicated Configuration)
is a software feature that creates redundancy in a cluster of two call server instances.
The feature was designed to provide a higher level of communications reliability for
organizations that have critical resources or call center agents that need to be protected
against call server outages.
Active Standby / HARC can be implemented on UCX Appliances, UCX Cloud Hosted
and UCX Virtualized instances. Both the Active and the Standby nodes must be
the same type (Appliance/Appliance Cloud/Cloud Virtualized/Virtualized).
Mirrored configurations allow for servers to be manually switched for
Single IP Server Cluster.
In this application the two call servers are joined into a cluster and
will appear to the administrator, users, and all devices as a single system.
Both Call Servers must be on the same physical layer 2 network/subnet.
The UCX HARC software can be architected in combination with the
UCX Survivable Remote Gateway (SRG) functionality to increase
the overall availability of telephony services across geographically
Normal and Failover Modes.
During normal functionality all actions are performed by the Active Node.
In the event of a failure of the Active Call Server the High Availability
cluster configuration transfers control of all functionality from the
Active Node over to the Standby Node. The transfer of functionality
occurs automatically via the software.
Trunks And Digital Device Support.
Physical trunk interfaces and digital telephones cannot connect to both
of the Active and Standby nodes at the same time.
So if your office uses any of the legacy digital devices that are
supported by E-MetroTel (Nortel, Avaya, Panasonic) and/or you wish to
have your TDM lines or PRI as part of the Active/Standby solution they must
be installed in a separate chassis and that chassis connected to the same
network as the Active/Standby nodes.
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