---
title: "Blacklists and Whitelists"
canonical: "https://help.telegra.de/space/MCCE/9561348868046/Blacklists%20and%20Whitelists"
format: markdown
---
Number lists can be used to map a blacklist or whitelist in Call Flows.

Once a number list has been created, it can be accessed in the Call Flow via the "Branch on Number List" node.

Administrators must have the ***Number Lists: Modify*** right to manage number lists.

By the two different outputs of the routing node "Match" and "Not matched" it can be decided per routing whether it is a blacklist or whitelist. Depending on which continuation of the routing plan is configured behind each output.

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### Create and edit a list of numbers

- Click on ***Call Handling → Number Lists*** in the menu bar. A list of already defined number lists is displayed.
- How to add a new number list:
  - Click **Add**. The New number list page is displayed.
  - Enter the name of the number list (up to 100 characters).
  - Create a short description of the number list (up to 250 characters).
  - To add a number to the number list, click **+**
  - Add under Number List Entries, enter the number, and click** Save**. The number can be either an origin number or a destination number. International numbers must have a + and a country code, for example +4933607. (To remove a number from the list, select the number and click *Delete*).
- To remove a number list, select the corresponding number list and then click **Delete** and confirm that you want to remove the number list.

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