I got the HS820 to work with the H6315 with the patch I just announced in the other thread. Trying to find a home for downloads.

And you are correct. I had 2 headsets (HBH-300 and HS820) and neither would work with H6315 out of the box. With the patch HS820 and another one my friend had works (I forget the name but it was cheap and very small but seemed to work quite well). HBH-300 still did not work. But I think it may be faulty.