ShoreTel is compatible with most Plantronics and Jabra wireless headsets.  Please visit the links below to get the full list of what works with ShoreTel.

Jabra - http://www.jabra.com/headsets-and-speakerphones/compatibilityguide#selectedProducts=%5B%7B%22EhsRccSupport%22%3A2%2C%22EhsSupport%22%3Afalse%2C%22ID%22%3A5637206455%2C%22Manufacturer%22%3A%7B%22ID%22%3A5637148796%2C%22Name%22%3A%22ShoreTel%22%7D%2C%22Name%22%3A%22IP%20Phone%20480g%22%2C%22RccSupport%22%3Afalse%2C%22Retired%22%3Afalse%7D%5D

Plantronics - http://www.plantronics.com/us/compatibility-guide/#/search/