The short answer is that if your computer says 'hey I have a recording device and a playback device' it will work. We have users who (choose to) use their laptop speakers and built-in mic without issues, and a plethora of users who bought their own very random headset - and they all 'just work.'
Now if you want your reps to be able to use some of the call control functions that some headsets have, like the answer button or hangup, then only a few brands and models work, and they require you to install the right software for it and the reps have to set some stuff up on their end... aka don't bother with that rabbit hole.
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Brad Murlin
Zillow, Inc.
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