Microsoft's LS-6000. I liked it so much I bought a second for my spouse. The outgoing sound quality is very good, the ear cups are tolerable for hours, and it d

Microsoft's LS-6000. I liked it so much I bought a second for my spouse. The outgoing sound quality is very good, the ear cups are tolerable for hours, and it doesn't keep me from hearing a phone ring in the next room. For use with my phone, QC-20i's.