Jabra actually provided a thoughtful answer (although no solution as of yet) here amongst the other discussions on the subject in the community:
https://community.mypurecloud.com/s/question/0D54400005Bz7EcCAJ/i-would-like-to-know-if-anyone-has-a-recommendation-for-a-usb-headset-to-use-with-the-soft-phone-that-is-capable-of-remote-call-controls-answerhangup-from-headset?t=1510061092117&searchQuery