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Adaptive Overload is the recommended mode for congestion controls with the SBC

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. In adaptive mode, a trigger MC level is defined. When this level is reached, based on the configured CPU utilization for that level, the SBC the 

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adjusts the system call and registration acceptance rate up or down to maintain the target CPU usage configured for that level. This maximizes the system throughput without exceeding the desired CPU bounds.

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During adaptive throttling, the SBC the 

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can assign different preferences (priorities) to normal calls, emergency calls, and initial SIP registrations. This is configured by the policer preference values assigned to each request type. Additionally, the maximum burst size is configurable.

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