# Restricting Stations from Using Outgoing Trunks

To restrict stations from outgoing trunks:

1. Class of Restriction Groups form

- Assign the COR of the station to a COR Group.

2. ARS Routes form

- Enter the station's COR Group Number in the COR Group Number field.

3. ARS Digit Modification Plans form

- Create an instance of the ARS Digit Modification Plans form that has the trunk access code (normally "9") in the Leading Digits field.

- Leave the remaining fields blank.