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Cisco IP Telephony Solution Reference Network Design
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Chapter 6 Call Processing
Call Processing Redundancy
Figure 6-3
1:1 Redundancy with Cisco CallManager Release 3.3 on Standard Server with 50/50 Load Balancing
Figure 6-4
Redundancy with Cisco CallManager Release 3.3 on MCS-7845 High Performance Server with 50/50 Load
Balancing
87422
Primary
Secondary/Backup
Distribute IP Phones based on DN
Load-share between Primary and
Backup servers
To 2,500 IP Phones
(5000 Devices Units)
To 10,000 IP Phones
(20,000 Devices Units)
To 5000 IP Phones
(10,000 Devices Units)
IP
M
M
M
Publisher and
TFTP Server(s)
1 to 1250: Primary
1251 to 2500: Backup
M
M
1 to 1250
M
1251 to
2500
M
M
Publisher and
TFTP Server(s)
M
Publisher and
TFTP Server(s)
1251 to 2500: Primary
1 to 1250: Backup
2501 to
3750
M
3751 to
5000
M
1 to 1250
M
1251 to
2500
M
2501 to
3750
M
3751 to
5000
M
5001 to
6250
M
6251 to
7500
M
7501 to
8750
M
8751 to
10,000
M
87423
Primary/Backup
Backup/Primary
Distribute IP Phones based on DN
Load-share between Primary and
Backup servers
To 7,500 IP Phones
(10,000 Devices Units)
To 15,000 IP Phones
(20,000 Devices Units)
To 30,000 IP Phones
(40,000 Devices Units)
IP
M
M
M
Publisher and
TFTP Server(s)
1 to 3750: Primary
3751 to 7500: Backup
M
M
1 to 3750
M
3751 to
7500
M
M
Publisher and
TFTP Server(s)
M
Publisher and
TFTP Server(s)
3751 to 7500: Primary
1 to 3750: Backup
7501 to
11,250
M
11,251 to
15,000
M
1 to 3750
M
3751 to
7500
M
7501 to
11,250
M
11,251 to
15,000
M
15,001 to
18,750
M
18,751 to
22,500
M
22,501 to
26,250
M
26,251 to
30,000
M