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.
Cisco IP Phone
Analog Skinny Client Control Protocol (SCCP) ports
Computer Telephony Integration (CTI) route point
CTI client port
CTI server port
CTI third-party control
CTI agent phone
Intercluster trunk gateway
Digital Media Gateway Control Protocol (MGCP) T1 gateway ports