# LERG Blocking

The Telcordia LERG database tells you many information of a phone number and the important data we get for call blocking purposes are : 

* Country of the Phone Number
* Operator Type of the Phone Number ( ex. Wireless, Landline, etc )

You can use the LERG blocking under "Auto Call Block" section in the Ingress Trunk setting to block calls by ANI or DNIS.

![](https://4102392624-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MXPCJcszvw7MAuHjiRr%2Fuploads%2FTcMHOKWmkoOQr2stwggp%2Fimage.png?alt=media\&token=f15b84bb-141d-4b59-8b4f-f425e4244e53)

The selection provided by Class 4 Fusion are as follows:

* Block non US ANI 
* Block Wireless ANI 
* Block Wireless DNIS 
* Block Toll Free ANI 
* Block Invalid +1 ANI
* Whitelist +1 Country for ANI