Cisco® CallManager Version 4.0 provides many improvements to security, interoperability, functionality, and productivity that were not included in previous versions of Cisco CallManager. The new feature set of Cisco CallManager 4.0 requires additional server memory in order to run successfully.
In response to recent data from Cisco Systems® labs and customers, Cisco has increased the minimum recommended amount of physical memory required to successfully operate Cisco CallManager clusters that are running Version 4.0 and later.
This product bulletin summarizes the new memory recommendations.
PUBLISHER MEMORY
Memory required for a Cisco CallManager publisher server follows:
• Cisco recommends a minimum of 1 GB of physical memory on all servers running Cisco CallManager 4.0 and higher. This includes both publisher and subscriber servers.
• Additional memory beyond 1 GB is required if you are doing two or more of the following:
– Using the Cisco AVVID (Architecture for Voice, Video and Integrated Data) XML Layer (AXL) interface or performing Structured Query Language (SQL) queries against the Cisco CallManager database
– Running the Cisco IP Telephony Backup and Restore System (BARS) application
– Using Cisco CallManager Serviceability Webpages and Real-Time Monitoring tool
– Using Personal Address Book (PAB)
– Using third-party billing applications
• If the Cisco CallManager publisher is also operating as a primary or backup call processing agent, additional memory is required to run Cisco CallManager 4.0 and later. This means that a server that is acting as the database publisher and has the ccm.exe or cti.exe service(s) running requires additional memory.
Table 1 outlines the minimum memory recommendations for Cisco CallManager publishers running Version 4.0 and later.
Table 1. Memory Requirements for Cisco CallManager Publishers Running Version 4.0 and Later
Condition or Server
Cisco 7815 Media Convergence Server (MCS)
Cisco 7825 MCS
Cisco 7835 MCS
Base publisher memory requirements
1 GB
1 GB
1 GB
Publisher that is running Cisco CallManager service
1.5 GB
2 GB recommended
2 GB
2 GB
Publisher running two or more of the services listed previously
1.5 GB
2 GB recommended
2 GB
2 GB
SUBSCRIBER MEMORY
Memory required for a Cisco CallManager subscriber server follows:
• Cisco recommends a minimum of 1 GB of physical memory on all servers running Cisco CallManager 4.0(2a) and higher. This includes both publisher and subscriber servers.
• If you have more than 500 devices on a single Cisco CallManager server, Cisco recommends more memory. This includes devices that would fail over to that Cisco CallManager server if a server or network experiences outage.
• Cisco CallManager running co-resident with the Cisco Carrier Routing System (CRS) or the Cisco IP Contact Center (IPCC) Express requires more than 1 GB of memory.
Table 2 outlines the minimum memory recommendations for Cisco CallManager publisher servers running Version 4.0 and later.
Table 2. Memory Requirements for Cisco CallManager Publisher Servers Running Version 4.0 and Later
Condition or Server
Cisco 7815 Media Convergence Server (MCS)
Cisco 7825 MCS
Cisco 7835 MCS
Base Subscriber Memory Requirements
1 GB
1 GB
1 GB
Subscriber with more than 500 devices
Not supported
2 GB
2 GB
Co-resident Cisco CallManager and Cisco CRS or IPCC Express
1.5 GB
2 GB recommended
2 GB
2 GB
Note: Earlier versions of the Cisco 7815 have a maximum memory capacity of 1.5 GB. These servers should continue to operate properly under the constraints within which they were designed to run.
MEMORY IN ORDERABLE CISCO MCSS
Table 3 outlines the current base memory in shipping Cisco MCSs.
Table 3. Base Memory for Cisco MCSs
Server Part Number
Base Memory
MCS-7815-I1-IPC1
1 GB
MCS-7815-I1-IPC1
2 GB
MCS-7815-I2-IPC1
2 GB
MCS-7825H-3.0-IPC1
1 GB
MCS-7825-H1-IPC1
2 GB
MCS-7825-H2-IPC1
2 GB
MCS-7825I-3.0-IPC1
1 GB
MCS-7825-I1-IPC1
2 GB
MCS-7825-I2-IPC1
2 GB
MCS-7835-H1-IPC1
2 GB
MCS-7835-I1-IPC1
2 GB
MCS-7845-H1-IPC1
4 GB
MCS-7845-I1-IPC1
4 GB
MEMORY UPGRADE
Refer to Tables 4 and 5 for part numbers for the new Cisco CallManager memory recommendations. The products should be ordered directly from HP or IBM, respectively.
