Cisco OL-4660-01 - Manual (Page 6)

Chapter 4 Cisco Call Back
Introducing Cisco Call Back
4-6
Cisco CallManager Features and Services Guide
OL-4660-01
Figure 4-2 Cisco Extended Functions Service Dependency (Typical
Configuration)
Multiple Cisco Extended Functions Applications in a Cluster
If multiple Cisco Extended Functions applications are active within a
Cisco CallManager cluster, Cisco Extended Functions uses an algorithm to
determine which application should be active and to order the remaining as
backups. The Cisco Extended Functions application with the lowest IP address
becomes active. The application with the next lowest IP address becomes the
backup to the active application. Any remaining applications act as backups to
each other, beginning with the application with the next lowest IP address. If you
add any new applications to the cluster, Cisco Extended Functions restarts the
algorithm to determine which application will be active.
Note When a Cisco Extended Functions application gets started in a cluster, the Cisco
Extended Functions application with the lowest IP address becomes active. This
process may cause an interruption to Call Back for approximately 2 minutes.
To verify the directory status and Cisco Extended Functions application
registration status to the Cisco CTIManager, use the Real-Time Monitoring Tool
as described in the Cisco CallManager Serviceability Administration Guide.
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