Could this behavior be changed to indicate the actual duration of the incoming call? Since the ooma hub detects a dial tone, shouldn't it be possible to time the absence of the dial tone while the handset is in use and to use that as the call duration? And if this does get done, a different color text for those calls would be nice.
If this is too much, how about putting "N/A" instead of "Missed" as the text? The way it is now, there's no way to distinguish between real missed calls and calls that were answered on a phone connected directly to a wall jack.