How Is Redundancy Achieved?
If you follow Cisco recommendations, your cluster would be configured as follows:
One Database publisher/TFTP server (A)
Two primary Cisco CallManagers (B and C)
One backup Cisco CallManager (D)
You would require two CallManager groups for redundancy (configured as
follows):
Group Primary CallManager Secondary CallManager
BD B D
CD C D
You then need to configure half the IP phones to use group BD, and half to
use CD to facilitate load balancing.You would achieve this by configuring the
following device groups:
Device Group IP Phones
A 1 to 1,400
B 1,401 to 2,800