Value,Description,Reference
0x00,Reserved,[RFC5974]
0x01,Reservation successful,[RFC5974]
0x02,Teardown successful,[RFC5974]
0x03,Acknowledgement,[RFC5974]
0x04,Refresh successful,[RFC5974]
0x05-0x7F,Unassigned,
0x80-0xBF,Reserved for Experimental/Private Use,[RFC5974]
0xC0-0xFF,Reserved,[RFC5974]