Automatic call playblack allows you to continuously listen to calls, one after another, without interruption. For example, when you click on a call to view the summary, the details or the Moments, you‘ll start the audio playback and, once it has finished, you‘ll be moved onto the next call.
By default, this feature is disabled. If you want to enable it, go into your Settings and then into your general settings, and click on the enable box to active the automatic call playback feature: