Lync, Windows 7 and automatic volume reduction / ducking / attenuation

Hi all, I’m seeing a strange behaviour with the sound attenuation/ducking feature in Windows 7 and Lync and wondered if anybody else had experienced and/or
has any ideas about it. This feature reduces the volume of non-communication audio streams (by 50,80 or 100% according to your preference) when it detects a communication device being used.
However it seems to reduce the volume of Lync as well, and I don’t understand why it would do that or what the point of it is.
So for example I set the 'ducking' to 100% (select the “Mute all other sounds” on the Communications tab in the sound control panel), then somebody rings
me. As soon as the phone starts ringing, the volume slider for Lync in my volume mixer drops to 0 and the phone goes silent. It seems a bit random but on some occasions I also can’t hear the person on the other end of the phone.
When I hang up, the volume slider goes back up again.
Is that how it is supposed to work or have I just got it all horribly wrong?
Any ideas very gratefully received.
Thanks,
John

Hi Andrew, I didn't make much more progress I'm afraid. I was intending to raise a pss case but had real trouble replicating the issue with any consistency so at the moment we have disabled the attenuation feature on Windows 7 until we have time to investigate
it more thoroughly.
Weird that you see the same issue on XP though as I also thought it was only on Windows 7.
I found a blog entry (http://blogs.technet.com/b/toml/archive/2011/01/14/ducking-music-volume-experience-with-incoming-lync-call-using-zune-player.aspx)
that also described the same issue (still windows 7 though) but still no explanation as to why, although it looks like the author is (was?) investigating it.
I still intend to investigate it in more detail, but it has dropped down the priority list for us at the moment, so if I do find anything I will update this discussion.
Regards, John

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