Webex: How to Call Someone in Your Organization
In Webex, you get assigned a calling option that works best in your organization or for your individual needs. So, when you make a call from the app, your calling experience depends on your account settings.
Getting Started
You can make a call from many different places in Webex. Just look for the Audio or Video call icons whenever you're working directly with one other person, like when you're messaging them directly, searching for them, looking at their contact card, or entering their name or email address into the dialpad.
Choose whether you want to make it an Audio or Video call and then choose Call on Webex.
After your call connects, you can turn your video on and off (no matter how you placed the call originally), click 
to share your screen, and click 
to share your whiteboard.
to share your screen, and click to share your whiteboard.