Microsoft announced back in March 2021 that IT would bring end-to-end encryption (E2EE) calling to Teams, which also went live in the Teams Beta. According to Mspoweruser, the feature is currently available in the Teams app and can be turned on by all users in their Settings.
Note that this function can only be enabled for one-to-one calls and does not support group voice calls. In addition, after this function is enabled, the following functions are unavailable during calls:
Real-time subtitle transcription and translation
Call Transfer (Various Rules)
The call to keep
Call to merge
Cal Companion allows calls to be transferred to another device
Add a participant and change it to a group call
IT Home has learned that the latest versions of Teams Windows and Mac clients already support end-to-end encrypted calling, but not mobile and web versions.