There are different options depending on what the device is. If it's an older Webex device (SX/MX) you would need CVI/VIMT, which is a gateway service. Newer (but not newest) you would have that option plus WebRTC. The latest and greatest endpoints actually will support native MS teams protocol. Take a look at this document, this will help you: https://www.cisco.com/c/dam/m/en_in/pdf/join-any-meeting-on-webex-devices.pdf