We use UCM Calling Registration. If we're on a call via softphone with WebEx Teams, we're able to share our screen successfully. However, if we're on a call using a desk phone (via CTI Control), in an attempt to share the screen, the Teams client notifies us that we're already on a call and are unable to place another one.
It is very important that this ease of use is improved. More often than not, users will share their screen while already on a call. Forcing a user to either hang up and replace the call via softphone or spin up a webex is disruptive and makes for a very poor user experience.
Please get this feature prioritized as it is a key feature which is available in Jabber but still unavailable in Teams.