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What are the IP Telephony Device weights used for Cisco CallManager server capacity planning purposes?


Core Issue

The base device weight for each device type is based on the consumption of memory and CPU resources consumed.

The base weight of each device is calculated using 6 or fewer busy hour call attempts (BHCAs). As the quantity of BHCAs increases, so also does the number of transactions the servers are required to process and, therefore, the weight of the device on that platform.

Each of the Cisco CallManager server platforms provide different CPU and memory capacity. The appropriate server can be selected based on the total calculated weight that needs to be supported.


The following table shows the device weights for Cisco CallMananager 3.x and 4.x.

Device TypeDevice Weight
Cisco IP Phone1
Analog Skinny Client Control Protocol (SCCP) ports1
Computer Telephony Integration (CTI) route point2
CTI client port
CTI server port2
CTI third-party control3
CTI agent phone6
H.323 client3
Intercluster trunk gateway3
H.323 gateway3
Digital Media Gateway Control Protocol (MGCP) T1 gateway ports3
Digital MGCP E1 gateway ports3
Music on hold (MoH) stream10
Transcoding resource3
Media Termination Point (MTP) (Software)3
Conference resource (hardware)3
Conference resource (software)3
Analog MGCP ports3

For more information,  refer to Unified Communicaitons SRND based on Cisco Unified Callmanager 4.x

CallManager Versions

CallManager 3.x, CallManager 4.x

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