In short, yes!
Most any headset with an analogue Rj11 end (looks like the old telephone connector) should be compatible with one of our phones. If you find one you like, run it pas the support team before purchasing so we can make sure for you.
At this time we don't make any recommendations or offer support on headsets because we haven't performed the necessary testing in order to ensure a particular product will work well.
Attached is a list of headsets that should be compatible with most of our phones.