Assign a modification to a trunk group:

1. Go to the "Routing" → "Trunk Groups" menu.

2. Double-click the line with the required trunk group.
   

3. Go to the "Incoming calls" or "Outgoing calls" section, depending on the direction of the call to be modified.
4. In the "Add" field, select the direction to be modified: CgPN or CdPN.
5. Click the button.
   
6. In the added field (CdPN or CgPN), select the desired modification.