RAAT and NAA are completely different systems. I can answer any questions about RAAT, but I know nothing of NAA internals 
RAAT uses a TCP control channel for basic/management tasks, but the actual audio stream is transmitted over UDP. We also use UDP packets for clock synchronization and to manage resends of dropped/lost packets. The protocol is completely custom–i.e. it is not an application or adaptation of one of a pre-existing system like RTP/RTSP.