When the endpoint is selected from the app, the endpoint is controlled by the app and displays the layout that is selected in the app.
Video endpoints calling directly in to a space display the defaultLayout. If set up via the API, users can scroll through different layouts using a DTMF sequence.
For more information, please refer to the API Guide. You can find it on http://www.cisco.com/c/en/us/support/conferencing/meeting-server/products-programming-reference-guides-list.html