Command,Description,Reference
0,IS,[RFC2946]
1,SUPPORT,[RFC2946]
2,REPLY,[RFC2946]
3,START,[RFC2946]
4,END,[RFC2946]
5,REQUEST-START,[RFC2946]
6,REQUEST-END,[RFC2946]
7,ENC_KEYID,[RFC2946]
8,DEC_KEYID,[RFC2946]