# DNC Blocking

Each DNL Class 4 Fusion switch is integrated directly to DNC database which is updated once a week.  To block calls by DNC, you can go to "Auto Call Block" under Ingress Trunk setting.

![](https://4102392624-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MXPCJcszvw7MAuHjiRr%2Fuploads%2FaEPAqBI7Bh41prOBJqd2%2Fimage.png?alt=media\&token=e7a08e4a-dc4f-440e-a7aa-d85696580203)

## Configuring DNC Block

You can then select "Block DNC DNIS" and submit to enable DNC Blocking for this trunk:

![](https://4102392624-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MXPCJcszvw7MAuHjiRr%2Fuploads%2FJ514SjBczfMYaF59xnvv%2Fimage.png?alt=media\&token=a4828cfc-0876-4efc-917d-188b70e3ad38)