The history tab shows a complete history of all incoming and outgoing calls to or from this instance of the softphone. Please note that if you have multiple instances of the softphone running (for example, one on your workstation, and one on your mobile phone), each softphone will only show the outbound calls that it made. The app will not show calls made from other devices. Incoming calls will show on all devices, being shown as "answered elsewhere" on devices that did not answer the call.
The history tab looks like this:
To view all logs for a particular caller, click their name in the history tab:
To return the call, click the telephone icon at the top of the window to the right of the caller's name/phone number.
Currently, you will need to click on a missed call entry in order to clear the counter badge on the History tab.