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The SBC Core supports Monitor congestion controls using four machine congestion levels. Each level represents an increasing severity of congestion within the SBC:

  • No Congestion—All calls are processed.
  • levelMC1 – Limited congestion level. By default, no calls are rejected due to congestion in this level.
  • levelMC2 – Moderate congestion level. By default, the adaptive congestion controls activate when this level of congestion is reached.
  • levelMC3 – Critical congestion level. By default, this level is disabled since the adaptive congestion controls (which activate at levelMC2) prevent the box from reaching this level.


For details of configuring system congestion controls, refer to:

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