The requirements are as follows:

• For any conversion, the survivable core server should always be addressed before the main server. When a survivable core server is not controlling a Media Gateway, it can be converted without disrupting service.

• If possible, disconnect survivable core servers from the LAN/WAN until the main server is operational. Then connect the survivable core servers to the LAN/WAN and allow them to register with the main server.

• Two main servers should never be active on the LAN/WAN at the same time. When converting a server to a main server, care should be taken to disconnect or power down an existing main server before the new main server comes online.

• When converting servers, survivable core server to main server, or main server to survivable core server, a new license file is required. There are no exceptions and no way to turn on the required features without a new license file.

• The main server requires a MAC address to generate a license file in PLDS.

• All conversion options, including the main server (non survivable core server to main server, survivable core server to main server, and main server to survivable core server) is service affecting. When Media Gateway are controlled by a new server (main server or survivable core server), they perform a restart which resets every Media module in the Media Gateway.