From Microsoft's 365 Message Center
We are simplifying the calling experience in the Teams desktop app (Windows and Mac) by providing a streamlined view that combines contacts, voicemail, and calling history.
Key points
How this will affect your organization
When your users update the Teams desktop app, they will see the new calling experience. A streamlined view shows contacts, voicemail, and calling history at once, making it easier to initiate or return a call with a single click.
Additional enhancements that are coming to Teams Calling:
What you need to do to prepare
You might want to notify your users about this new capability and update your training and documentation as appropriate.