Reopening this bug. It seems I didn't test very thoroughly on Maverick, or 
maybe there is a regression, but currently duplex audio on my headset almost 
never works. Curiously, it sometimes does, but I have not been able to find a 
reproducible sequence of steps that make it work or stop working. I tried 
quiting/restarting skype, killing pulseaudio, disconnecting/reconnecting the 
headset through the bluetooh applet, turning it off/on... it justs seems to 
work some times, but most of the time it doesn't. There is just no audio coming 
out of the headset in duplex mode, although it seems the headset is being 
"activated" when an application tries to send audio to it (I can hear a faint 
hum when it activates).
Switching to A2DP on the fly while there is audio playing works fine. Switching 
back to duplex, the sound disappears. I tried with several applications (skype, 
video player, firefox), the result is the same. 
Note that it seems it can work only once per boot: if it works at some point, 
stopping audio output and resuming it later seem to always trigger the problem, 
until the next reboot. Also note that it does not systematically work 
immediately upon reboot, although it often does: it might start working after 
some time. But if it worked once, it won't work again later.
I haven't seen any relevant message in syslog, but I don't know if it's the 
correct place to look at.

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No duplex audio over bluetooth using Dell adapter
https://bugs.launchpad.net/bugs/576051
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