If you look at the list of certified Session Border Controler , you can see that the functionality Media Bypass is not yet "certified" by any vendor SBC. We know that Media Bypass is currently under development and we look forward to testing it soon.
For those unfamiliar with the terminology, "Media Bypass" means that voice traffic (media) routes directly between the user/client endpoint and the certified SBC , rather than routing from the user/client to cloud, then SBC ( so that the media "bypasses" Cloud). This is an important feature for scaling and optimizing your direct routing with Microsoft Teams.