Use the Ani Dnis Zoneloop Detection window to configure the SBC ANI-DNIS loop detection feature. In the context of a SIP call request, the ANI (Automatic Number Identification) refers to the calling party, as determined by the username in the P-Asserted-ID or From header. The DNIS (Dialed Number Identification Service) refers to the called party as determined by the username in the Request URI.  An ANI-DNIS loop refers to a situation when more than one call request shares the same combination of ANI and DNIS values. To avoid excessive looped call requests, the SBC provides configuration options to limit the number of pending call requests that share the same ANI-DNIS combination. Refer to ANI-DNIS Loop Detection for more information.

To configure ANI-DNIS loop detection options:

  1. From the SBC main screen, go to All > Address Context > Zone > Ani Dnis Zoneloop Detection The Ani Dnis Zoneloop Detection window opens.

  2. In Address Context and Zone, select the address context and zone for which you want to configure ANI-DNIS loop detection. The Edit Ani Dnis Zoneloop Detection options appear.

  3. Use the following table to configure the ANI-DNIS loop detection options and then click Save.
    Table 1: ANI-DNIS Loop Detection Parameters

    ParameterDescription

    Ani Dnis Zone State

    Use this parameter to enable or disable ANI-DNIS loop detection for the specified zone.

    • Disabled (default)
    • Enabled

    Ani Dnis Zone Loop Instances

    Specify an integer limit on call requests containing matching ANI-DNIS pairs. When the limit is reached, the SBC rejects any subsequent call requests for the same ANI-DNIS combination. The valid range is 1 to 1250. The default value is 1.