The wiki page you reference mentions a file called /etc/bluetooth/audio.service.
That file is missing from the Debian bluez-utils package.  See
http://article.gmane.org/gmane.linux.bluez.user/13279/match=etc+bluetooth+audio+service
for some relevant traffic on the bluez-users list.
Here's a link to the bug report:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=452610
So this looks like an upstream problem.

-- Chris