In partnership with Cisco, you’ll now be able to join Cisco WebEx meetings through Microsoft Teams. After you enable Direct guest join though settings, schedule a new Cisco WebEx meeting or forward an existing meeting to the Teams Room on Android. The meeting will appear on the calendar and will be available to join.
Note: Direct guest join Cisco WebEx will be initially available on Poly. Other manufacturers will receive it shortly after.
This answers a question I have always had with Teams Room devices.