Thanks for coming back with the details on this. Indeed live tile updates and notifications are not supported for missed calls. We are supporting them for IM, received photos, video messages and other in conversation events.
Adding missed calls is on our list of future additions. Please continue supporting this idea if it's important for you.
cool, waiting for accepted status, implementation should be quite easy
any news? come on should be really quite easy to implement!
finally implemented in yesterday update ... thanks!
...now REAL file transfer !