Well, just in case someone is interested, I just tried it with my Qtek and it displays now the provider and signal strength and I get my custom ringer, just like the Treo 650 did. I probably give it a try with another pda running wm2003 or wm5 that did not work by default with the RNS-E but for now the Qtek 9100 is fully integrated into the car.
Tried on my Moto Mpx220 - now have phonebook transfer, missed calls, dialed calls, everything! Also get "Telephone Cingular" showing as well as the signal strength indicator. None of this worked before. The only thing that does not work is the ring tone. I still have the generic ring from the RNS-E. No big deal, I am quite happy with the increased functionality.
As a total side note, I now get substantially better sound quality and the signal strength indicator in my Lexus GX as well.
Will give it a thorough testing over the next few days. Only thing I noticed is that when I was installed it, the phone would connect with the car then a minute later it would lose the connection. After I restarted a couple of times, it seems to be fine.
Their web page only mentions PocketPC and Windows Phones. But this shows clearly that it's a matter of how the engineers implement the BT features on the phone side, and not how Audi designed their phone interface.
I use it too with me Qtek 9100 (MDA Vario) and it works almost great!
- ringtone plays through speaker (and since the Qtek can play mp3 files, this is really nice!)
- signal strength and operator name are now displayed
- phone book filtering however does NOT work, so I put that off (now I have 2000 contacts, I prefer to have only 100-200 synced with the RNS-E, but this feature does not seem to work)