Webex App | Make and answer calls from another app
You can extend the calling capabilities of the Webex App to a Contact Center thin client, a receptionist app, or a third-party application. While you are using Webex App, all of your calls will go via it, and it will continue to run in the background. When you make a call from another app or answer a call made by another app, you will hear a specific tone that will let you know the call is connected. You should check to be that you do not have any other devices provisioned, such as a desk phone, or that your administrator makes the Webex App your primary device.