If you are installing an S8300 server as a Survivable Remote Server (SRS), the license file for S8300 must have Communication Manager release that is equal to or later than that of the server that acts as a primary controller. In this case, if control passes to the SRS, it can have the same level of call processing as the primary controller.
The SRS must have a version of Avaya Aura® Communication Manager, which is the same as the primary controller version.
The license file requirements of the SRS should be identified in your planning documentation.