1.3.1 Audio Redirection Protocol Transport Options
Remote Desktop Protocol: Audio Output Virtual Channel Extension information can be exchanged between the client and server via two different transport methods:
Static or dynamic virtual channels can be used to transmit all information between client and server and have to be used for some sequences. For certain sequences, however, UDP can 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.