1.3.1 Audio Redirection Protocol Transport Options
Static or dynamic virtual channels may be used to transmit all information between client and server and must be used for some sequences. For certain sequences, however, UDP may be used as well. Throughout this document, references are made to sending data over static or dynamic virtual channels and over UDP.
Throughout this document, the term virtual channel is used if it applies to either dynamic virtual channels or static virtual channels.
The term dynamic virtual channel is used when either a reliable transport or an unreliable UDP transport, as specified in [MS-RDPEUDP], is used.