Recommended CallManager Configurations

Recommended CallManager Configurations
Recommended CallManager
IP Phones Configuration Redundancy Groups
2,500 Three CallManager servers: One group, servers AB:
 Database publisher/TFTP  Server A primary CM for
server (A) all IP phones
 Primary Cisco  Server B backup CN for all
CallManager (B) IP phones
 Backup Cisco
CallManager (C)

Four CallManager servers: Two groups, servers BD,
 Database publisher/TFTP and CD:
server (A)  Server B primary CM for
 Two primary Cisco IP phones 0–2500
CallManagers (B and C)  Server C primary CM for
 Backup Cisco IP phones 2501–5000
CallManager (D)  Server D secondary CM for
all IP phones
10,000 Eight CallManager servers: Four groups, servers CE, DE,
 Database publisher (A) FH, and GH:
 TFTP server (B)  Server C primary CM for IP
 Four primary Cisco phones 0–2500
CallManagers (C, D, E, and F)  Server D primary CM for IP
 Two backup Cisco phones 2501–5000
CallManagers (G and H)  Server E backup CM for IP
phones 1–5000
 Server F primary CM for IP
phones 5001–7500
 Server G primary CM for IP
phones 7501–10000
 Server H backup CM for IP
phones 5001–10000