http://www.rfc-editor.org/rfc/rfc5595.txt
RFC 5595: The Datagram Congestion Control Protocol (DCCP) Service Codes, G. Fairhurst2009-09-01T23:00:00-00:00This document describes the usage of Service Codes by the Datagram Congestion Control Protocol, RFC 4340. It motivates the setting of a Service Code by applications. Service Codes provide a method to identify the intended service/application to process a DCCP connection request. This provides improved flexibility in the use and assignment of port numbers for connection multiplexing. The use of a DCCP Service Code can also enable more explicit coordination of services with middleboxes (e.g., network address translators and firewalls). This document updates the specification provided in RFC 4340. [STANDARDS-TRACK]