Yep, clearly.
upnp means different things.
The router per default does only upnp port forwarding controll, like for messaging software and such.
You want upnp MEDIA SERVER SOFTWARE like twonkeyvision!.
Your in luck, since this can be run on the asus with just a little handwork .
Few other routers have the option to be a media server at all. So Asus was quite a good choice...
Greets
Wlanman