Recommendation : Always use a wired USB headset with microphone. This is for ease of setup, call clarity and reliability. Be sure to have the correct connection type (USB-A, USB-C)
For a list of approved headsets, please see this link:
*You will see that some bluetooth devices are approved however, please be sure they are not paired with any other device(s) while on a call. Wireless devices (including air pods) can switch paired devices without your permission.
Other compatible headsets: Wireless headsets, Bluetooth headsets, 3.5mm earphones can all work with your soft phone. This is assuming there is a working microphone but all come with their own set of caveats. In turn, this can make them more difficult to setup, less reliable in terms of call quality and more difficult to use.