I wouldn't think that this is the experience that we want. Do you know if the screen went blank or if the computer actually went to sleep? You may have your screen off and sleep settings set to the same time.
Knowing which it is will help us to fix the issue since we definitely shouldn't have let the computer go to sleep if a call was in progress, but probably should let the call continue with the mic and speakers even if the screen turns off.
If you can let us know, we can make sure to file a bug for it.
Are you still experiencing the issue with your microphone and speakers muting once the screen turns off? If so, please take a look at the PM I sent last week so we can work on getting a bug report filed.
Apologies for the delay. Yes, the problem is still there.
Anytime the screen goes off on the tablet everything gets muted. Speakers and mic.
Probably a flaw of Windows though.