Im not sure about connecting direct to Avant, but the camera aux should work : (remember to set up your beo4;add camera aux to LIST), If you have a BeoCenter or a amplifier, then use input standard Aux (beo4, A.AUX) together with a Belkin Bluetooth Music Receiver.
The sound from Belkin is surprisingly very, very good, properly one of the best you can buy today, and it works with all units that have bluetooth. The best thing is that the receiver is very cheap (50$) ! I use Belkin with my Avant 32" together with BeoCenter 2 and 4 Penta speakers powered by pure ICEpower. The sound form my Android HTC Desire HD smartphone is great, so seriously - go for it!
http://www.belkin.com/IWCatProductPage.process?Product_Id=508754