1. Navigate to Dialing > Campaigns.
2. Click on the dial group name to expand it and see the list of campaigns assigned to that dial group.
3. Click on the campaign name you want to configure.
4. Scroll down to the Dialer Settings section and check the Voicemail Detection Enabled checkbox.
5. Click on the Voicemail Detection Profile field and select a profile from the dropdown menu.
6. Click Save.