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The

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detects congestion by monitoring a time-decaying average of the CPU utilization. It also monitors the Internal Round-Trip Time (IRTT) during call setup for determining whether the

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is in congestion. When congestion (for either reason) is detected and the congestion level reaches MC2, the SBC activates a control algorithm which adaptively throttles calls to eliminate the congestion while still maximizing the call throughput.

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0 Table 1 System Congestion Status Parameters
Parameter Description Name The name of the CE Node. System Congestion MCLevel System congestion level. System Congestion CPULevel The current System Machine Congestion (MC) Level at the time this command is executed. 0 – No Congestion 1 – Level one congestion 2 – Level two congestion 3 – Level three congestion System Congestion Call Rate Level Call rate congestion level. System Congestion IRTTLevel Internal RoundTrip Time (IRTT) congestion level. System Congestion MCDuration Number of seconds the system has been at this congestion level. System Congestion Call Arrival Rate A snapshot of the number of call arrivals in the last second. System Congestion Call Accept Rate Current rate at which calls are being accepted by the system. System Congestion Call Accept Count Current number of calls being accepted by the system measured in calls/second. A value of "65535" represents all calls. During MC2 congestion, SBC calculates the CallAcceptRate peridocially (each second), and uses the value to compute a new CallAcceptCount. System Congestion Call Eq Arrival Rate The weighted sum of the number of SIP calls, registrations, SUBSCRIBEs and any other SIP traffic that arrived at the SBC in the last second. For purposes of calculating the weighted sum, 4 units of any SIP non-INVITE traffic is considered equivalent to a call. System Congestion Register Arrival Rate A snapshot of the number of SIP registration arrivals in the last second. System Congestion Subscriptions Arrival Rate The number of SIP SUBSCRIBEs that arrived in the last second.