# Digit Barring

You can use digit barring to restrict the call numbers that can be dialled.

You can use digit barring to bar undesirable call destinations. Digit barring checks the dialled digits against a barred list or a free list. Depending on the result of the check, the connection is or is not set up. External digit barring checks calls numbers in the exchange; internal digit barring checks call numbers with internal destinations.

You have several internal and external digit barring options, which you can configure differently. You assign one of these internal and external digit barring options to the users. Depending on the switch position of Switch group 1, you can assign various internal and external digit barring types.

The internal digit barring is used to bar internal call numbers; the external digit barring is used to bar external call numbers.

You select whether in a digit barring all the call numbers are barred or free as a matter of principle and then you define the exceptions.

Note:

The digit barring options assigned after a first start already contain country-specific entries.

## General rules for entering call numbers

A call number is compared from left to right with the entries of the assigned digit barring.

An entry may consist of up to 20 characters. The following characters are allowed:

- Digits from 0 to 9

- Characters *, #, A, B, C, D

- Control key/flash key (analogue terminals only)

Table 1. Examples with the basic function All free
Entries | Effect
“06” in the barred list | All call numbers beginning with "06" are barred.
"062" on the barred list | All call numbers beginning with "062" are barred.
"062" and "054", both on the barred list | All call numbers beginning with "062" and all call numbers beginning with "054" are barred.
"06" on the barred list, 062 on the free list | All call numbers beginning with "06" are barred, with the exception of call numbers beginning with "062".

## Editing a digit barring

- To open a digit barring in the edit view, click the name or number of the digit barring in the overview.

- To edit a digit barring, make the modifications then click the Apply button to store them.

## Assigning digit barring options to users

The digit barring options are assigned when you configure the permission sets "Permission set".

Parent topic: User administration
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