You can move an active call from your desktop app to your mobile app and take your call on the go. You can also pull an active call from your mobile app when you arrive at the office and continue your conversation on your desktop app.
While you're on a call in the mobile app, select Calls and then Call Pull to pull your call from your mobile device to your desktop app.
https://help.webex.com/en-us/g9f3yo/Webex-Pull-a-Call-from-One-Device-to-Another