From the Home tab, you can listen to a phone call that will be sent to a person, or that has been sent. You know whether or not it's been sent by looking for the Msg Time, and Msg Date on the Notification list. (you may need to scroll to the right to see these fields).
Click the phone icon next to a person's name in the Notification list to bring up a window to view the available phone call audio tracks.
To listen to a specific audio track, click the row at the bottom of the window to bring up the player at the top.
To download a specific track, click on the track and then click Download.