https://www.bleepingcomputer.com/news/security/microsoft-teams-adds-end-to-end-encryption-for-one-to-one-calls/

Microsoft has announced the public preview roll-out of end-to-end encryption (E2EE) support for one-to-one Microsoft Teams calls.

While Teams already encrypts data in transit and at rest, it also allows IT administrators to set up automatic recording and transcription of voice calls.