3.1.3.1 Creating an NSC File

The server MUST create an .nsc file at least once. The file MUST specify the IP multicast group and UDP port number to which the MSB packets are addressed. It also MUST specify all ASF headers that are needed by the client to parse the ASF packets, and assign a Format ID to each ASF header. All ASF headers in the .nsc file MUST have a different Format ID.<4><5>

A previously created .nsc file can be used instead of creating a new .nsc file, if the contents of the existing file are equivalent to the new .nsc file that would otherwise be created.