Code,Protocol,Reference
0,INVALID-PROTOCOL,[RFC6940]
1,DTLS-UDP-SR,[RFC6940]
2,Unassigned,
3,DTLS-UDP-SR-NO-ICE,[RFC6940]
4,TLS-TCP-FH-NO-ICE,[RFC6940]
5,EXP-LINK,[RFC6940]
6-254,Unassigned,
255,Reserved,[RFC6940]