3.1.3.1 Audio Level Protocol Initialization
The server MUST send an SAE_Started message to the client if the RDP session is being initially created, or it MUST send an SAE_RemoteConnect message if connecting to an existing RDP session. Upon receipt of either of these messages, the RDP client SHOULD reply with an SAE_VolumeChange message containing the same information as the last received SAE_VolumeChange message. If the RDP client has no persisted configuration data, then no response is sent.