DCCP (Datagram Congestion Control Protocol)
A [Transport Layer](Transport_Layer#Transport Protocols) protocol. not widely used, but has potential
- Unreliable, connection orientated, congestion controlled datagram service“
- TCP without reliability” or “UDP with connections and congestion control”
- Potentially easier for NAT boxes and firewalls than UDP
- Congestion control algorithm (CCID) negotiated at connection setup – range of algorithms supported
- Adds 32-bit service code in addition to port number
- Use case: streaming multimedia and IPTV