Enter your credentials.
Click on the "Admin" button on the lower left side of the screen.
Select the "Outbound Rules" tab.
Click on the "+ Add" button each time you create a new rule.
Click on the "Save" button after you configure each Outbound Rule.
Emergency numbers are configured in another tab in 3CX. Please follow our guide here: https://voxtelesys.com/tutorial/3cx-v20-add-911-rule
For adding 988 follow the image to the right.
Verify the outbound rules after creating.