Number,Description/Meaning,Reference
0,Reserved,[RFC4340]
1,Congestion Control ID (CCID),[RFC4340]
2,Allow Short Seqnos,[RFC4340]
3,Sequence Window,[RFC4340]
4,ECN Incapable,[RFC4340]
5,Ack Ratio,[RFC4340]
6,Send Ack Vector,[RFC4340]
7,Send NDP Count,[RFC4340]
8,Minimum Checksum Coverage,[RFC4340]
9,Check Data Checksum,[RFC4340]
10,Multipath Capable,[RFC-ietf-tsvwg-multipath-dccp-24]
11-119,Unassigned,[RFC4340]
120-126,Reserved,[RFC4340]
127,Unassigned,[RFC4340]
128-255,CCID-specific codes,[RFC4340]