Users need integration of Microsoft Teams in the Webex app, so that they can join Microsoft Teams meetings using Webex. The reverse seems to be available (i.e. able to join Webex meetings within Microsoft Teams) so why not this?
We already allow for a user from Webex app to click the Join button from the toast pop-up and in order to join a Microsoft Teams meeting. However, it will open a browser or the Microsoft Teams client (if installed) in order to provide a better user experience. Microsoft Teams does not use standard SIP Video Interoperability and thus the only way to join via SIP is to add Video Integration for Microsoft Teams (VIMT). However, that solution is very expensive to purchase and for Cisco to operate in the Azure DC's, so we have restricted VIMT to Hardware-only devices. The soft clients will always cross-launch to a Microsoft Teams app or web app.