USE provisioning;
SET autocommit=0;

SELECT id INTO @hunt_id FROM voip_preferences WHERE attribute = 'cloud_pbx_hunt_cancel_mode';

DELETE FROM voip_preferences_enum
    WHERE preference_id = @hunt_id;
DELETE FROM voip_preferences
    WHERE attribute = 'cloud_pbx_hunt_cancel_mode';

ALTER TABLE voip_subscribers
    DROP COLUMN pbx_hunt_cancel_mode;

COMMIT;