We have a cluster of five UCM's on a 7835H2 platform. What is the limit of simultaneous calls that the UCM can proccess before it starts to throttle?
According to the data sheet for CUCM 6.x:
Maximum of 100,000 busy-hour call completions (BHCCs) per Cisco Unified Communications Manager server and 250,000 per server cluster (configuration dependent)
A good thing to use would be the Cisco Unified Communications Sizing Tool. It is available at http://tools.cisco.com/cucst
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