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Overview

A Call Admission Profile provides SIP level call admission control by regulating call attempts per second, and the rate of new invite/non-invite sessions. Once the SBC limits are met, SIP will no longer accept/issue new invite or non-invite sessions (except 911 calls). This feature protects the SBC from overload conditions (an overload condition is detected if the average rate of invite and non-invite sessions exceeds the pre-determined limit or the CPU threshold is exceeded). It also prevents internal/external DOS attacks in an otherwise normal network using overload detection and resource leaks/malfunction detection.

When rejecting calls or sessions on account of admission-control, SBC sends "480 Temporarily Unavailable" response to the peers.

This functionality applies to SIP calls only.

Managing Call Admission Control

  1. In the WebUI, click the Settings tab.
  2. In the left navigation pane, go to SIP> Call Admission Control Profile. The Call Admission Control Profile window is displayed.
  3. From the Admin State drop down box, select Enable (default; enables Call Control feature) or Disable (disables Call Control feature).
  4. Click Apply.

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