Can't see whose talking with Voice over IP

For some reason I can't see the names of people who are talking during the game. When I talk i see my name in the bottom left of the HUD, but it doesn't seem to work when anyone else is talking. Does anyone else have this problem or is there something I need to select in my settings?

It's a known issue that many have been encountering. To my knowledge, there isn't a workaround at the moment.