Value,Message,Implementation,Status,Reference
0,Reserved,,,
1,ERROR_RESPONSE,gateway,mandatory,[RFC3103]
2,REGISTER_REQUEST,host,mandatory,[RFC3103]
3,REGISTER_RESPONSE,gateway,mandatory,[RFC3103]
4,DE-REGISTER_REQUEST,host,mandatory,[RFC3103]
5,DE-REGISTER_RESPONSE,gateway,mandatory,[RFC3103]
6,ASSIGN_REQUEST_RSA-IP,host,optional,[RFC3103]
7,ASSIGN_RESPONSE_RSA-IP,gateway,optional,[RFC3103]
8,ASSIGN_REQUEST_RSAP-IP,host,mandatory,[RFC3103]
9,ASSIGN_RESPONSE_RSAP-IP,gateway,mandatory,[RFC3103]
10,EXTEND_REQUEST,host,mandatory,[RFC3103]
11,EXTEND_RESPONSE,gateway,mandatory,[RFC3103]
12,FREE_REQUEST,host,mandatory,[RFC3103]
13,FREE_RESPONSE,gateway,mandatory,[RFC3103]
14,QUERY_REQUEST,host,optional,[RFC3103]
15,QUERY_RESPONSE,gateway,mandatory,[RFC3103]
16,LISTEN_REQUEST,host,optional,[RFC3103]
17,LISTEN_RESPONSE,gateway,optional,[RFC3103]
18-21,Unassigned,,,
22,ASSIGN_REQUEST_RSIPSEC,host,optional,[RFC3104]
23,ASSIGN_RESPONSE_RSIPSEC,gateway,optional,[RFC3104]
24-240,Unassigned,,,
241-255,Reserved for Private Use,,,