Provided you are on the Chrome or Chrome Mobile browser,, you can switch between cameras on whichever device you are using.
To do this, touch/click the leftmost video window, or mouse over it. This will bring up the in-video menu. Touch the button that depicts two cameras and SuiteBox will use the other camera.
If you are on Firefox or Internet Explorer 11, you will need to refresh your meeting. When you are asked to share your devices, you can choose which camera you want to use.