Bria is a softphone application by CounterPath that enables you to manage your communications from your computer desktop. Replacing or complementing your hard phone, Bria softphone allows you to: make VoIP and Video calls see when your contacts are available, send Instant Messages and transfer files.
Sennheiser Wireless headsets did not used to have good compat with Bria... BUT there is a brand new version of EPOS Coinnect for Windows. As of now, this program is not compatible with Mac, but something like that should arrive eventually.
Here’s where you can download the software for the new EPOS Connect:
Sennheiser Corded Headsets with Call Control require downloading the Headsetup software.