# Blacklist

With blacklist, incoming external or internal calls can be rejected based on their CLIP, left to come to "nothing" or routed to a specific destination.

Blacklist works only for external incoming calls and can be activated or deactivated for each trunk group.

An external incoming call can be processed because of its CLIP. For this enter the CLIP numbers in a blacklist. Activate the list in one or more trunk groups.

A call coming in via a trunk group, for which the parameter Use blacklist for incoming calls is activated, is handled as follows:

The CLIP is compared with the entries in the blacklist, starting with the topmost entry. If the digits of the CLIP starting from the left side matches an entry in the blacklist, the call is either rejected according to the configuration in the Action selection field, the caller receives a permanent ring back tone or the call is routed to another destination.

If the CLIP does not match, normal routing is used.

notes:

- All calls in the connection data collection are always entered, regardless of the chosen action.
- For mobile/external users, virtual PISN users and MMC mobile phones, the external call number is always first replaced with the internal user number, before the comparison with the blacklist is made.

## Creating and activating a blacklist

1. Click on the symbol.

2. Enter '+' followed by a digit sequence.

3. Confirm the entry with .

4. Make further entries. In so doing, follow the instructions under the list.

5. Choose the action that should be executed.

6. Click the Apply and sort list button.

7. Check the sorted list. Make sure that the entries are checked from top to bottom.

8. In the required trunk groups, activate the parameter Use blacklist for incoming calls.

The incoming CLIP is now checked for all external calls via the trunk group for which blacklist is enabled. If the CLIP digits starting from the left side match an entry in the blacklist, the action is taken.

Note:

Alternatively, you can also create the blacklist by importing an Excel file. For this, click the Import button and follow the corresponding instructions.

## Deleting CLIP numbers

To delete some CLIP numbers, click the symbol.

See also...

## Exporting and importing blacklist data

Blacklist data is part of the Excel export file and can also be edited externally. The export file contains a specific spreadsheet for this (System black list). For more details please refer to Importing and Exporting Configuration Data.

Parent topic: Destination
Parent topic: Emergency calls
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