This read-write Integer32, ranging from 1 to 200, is the booking factor for real time VBR service, a multiplier the switch applies when computing how much of an interface's capacity a new real-time VBR (Variable Bit Rate) connection is booked as consuming. An administrator tunes this booking factor to control call-admission aggressiveness for real-time VBR (Variable Bit Rate) traffic on the interface: a value above 100 lets the switch oversubscribe (statistically multiplex) real-time VBR (Variable Bit Rate) connections, while 100 books calls at their literal declared rate. For example, setting cwspUtilFactorRtVbr to 150 tells the admission-control logic to treat each new real-time VBR (Variable Bit Rate) call as consuming only two-thirds of its nominal bandwidth for booking purposes, allowing more real-time VBR (Variable Bit Rate) SVCs to be admitted on the same trunk.