Have a look at the image on the site (
http://www.vitat.spb.ru/eng/index.php?L1=ip-bus)
There is a picture of the IPBUS pinout. The connecter on your headunit should resemble that image. It may also be that the connector on the cd changer will look the same.
If so, it is very possible that it may be IPBUS compatible.
The Model number on your post definately looks like a pioneer model number... so it is pioneer... the question is just - is it ipbus compatible?