Yealink have produced a very handy document, listing compatible DECT / wireless, wired and bluetooth headsets for their range of IP desk phones.
There is a wide selection of tested headsets from the leading headset manufacturers including Plantronics, Sennheiser and Jabra. The document outlines which adaptors and cables are required for compatibility.
ProVu stock a wide range of headsets. Ask our sales team for more information.