Call load testing captures the results of busy hour call attempts (BHCA) tests. BHCA tests measure the volume of calls generated and handled, regardless of whether the calls are answered. The BHCA data is used in capacity calculations. Review Call Load Testing 
for an overview of the call loads that were tested with these site models:
•
Very Large Campus with Clustering over the WAN
•Large SIP Site
•Small Campus SIP Site
•Small Campus H.323 Site
•Cisco Unified CallManager Interoperability Site (NA)
See also Develop Traffic Engineering Specifications on the Design tab for more information on capacity calculations.