Endpoints use the exchange of Setup messages to negotiate any MOQT extensions to use.
The client includes all Setup Parameters Section 9.3.1 required for the negotiated MOQT version in CLIENT_SETUP.
Within any MOQT version, clients request the use of extensions by adding Setup parameters corresponding to that extension. No extensions are defined in this document.
The server replies with a SERVER_SETUP message that includes all parameters required for a handshake in that version, and parameters for every extension requested by the client that it supports.
New versions of MOQT MUST specify which existing extensions can be used with that version. New extensions MUST specify the existing versions with which they can be used.
If a given parameter carries the same information in multiple versions, but might have different optimal values in those versions, there SHOULD be separate Setup parameters for that information in each version.