Open CTI features can be made available to users when building a Lightning App using the App Manager by adding them on a utility bar of the Lightning App or on a record Activity Feed list. A utility bar is a fixed footer that displays utilities (such as Open CTI SoftPhone) as icons in a panel at the bottom of every page in an app. Users can access Open CTI features such as making calls, receiving calls, transferring calls, or logging calls from the utility bar. An Activity Feed list is a component that displays all the past and upcoming activities related to a record, such as tasks, events, emails, or calls. Users can access Open CTI features such as dialing a phone number or logging a call from the Activity Feed list. Verified References: Service Cloud Consultant Certification Guide & Tips, Add Utilities to Your App's Utility Bar, Add Activities to Your Lightning Pages