The Jabra PRO920 works well. It was a little confusing to set up, as the Quick Start guide covers 4 different setup options, depending on what type of phone setup you're adding it to. But I got it figured out and it works fine.
Our company has expanded over the past few years and this was the 5th Jabra headset I have purchase. Very reliable, easy to set up, and very hands free! The reception is great and clear.