# How to block certain numbers?

You can block unwanted numbers from calling your call routing number by adding a "Block" node in the call flow editor.

## Using the Block node

1. Open your call routing configuration
2. Navigate to the call flow editor
3. Add a "Block" node to your call flow
4. Configure the node to specify which numbers should be blocked
5. Connect the Block node to handle incoming calls from unwanted numbers

The Block node allows you to specify phone numbers (including country code, e.g. +12401234567) that should be blocked from reaching your call routing system.

To see your current call routing configuration, open the call routing configuration page:

{% hint style="info" %}
**Related Documentation**

* [Call Routing](https://docs.ilert.com/call-routing/getting-started-with-call-routing)
* [Phone Numbers](https://docs.ilert.com/getting-started/phone-numbers)
  {% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ilert.com/knowledge-base/call-routing/how-to-block-certain-numbers.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.