This is the guide you'll need for that second option (using device connector): https://help.webex.com/en-us/article/cy2l2z/Webex-Edge-for-Devices#id_127411 All the requirements are in the prerequisites on the same link above.

Hi Faisal, Endpoints registered to CUCM can call to WebEx cloud meeting via Expressway. The call flow would likely be: Endpoint > CUCM > Expressway-C > Expressway-E > WebEx cloud. If you've integrated your CUCM and on-prem endpoints to WebEx cloud (C...