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This protocol is designed to operate over three transports:
A static virtual channel, as specified in [MS-RDPBCGR] section 2.2.6 and 3.1.5.2. The virtual channel name is "RDPSND".<1> The usage of a channel name when opening a dynamic virtual channel is specified in [MS-RDPEDYC] section 2.2.2.1. The Remote Desktop Protocol layer manages the creation, setup, and transmission of data over the virtual channel.
A dynamic virtual channel, as specified in [MS-RDPEDYC]. The virtual channel name is AUDIO_PLAYBACK_DVC when a reliable transport is used; or AUDIO_PLAYBACK_LOSSY_DVC when an unreliable UDP transport, as specified in [MS-RDPEUDP], is used.<2> The Remote Desktop Protocol layer manages the creation, setup, and transmission of data over the virtual channel.
User Datagram Protocol (UDP), where the port is advertised in the Client Audio Formats and Version PDU (section 2.2.2.2).
Virtual channels MUST be used to establish connections, exchange capabilities, and change settings, and they MUST also be used to change audio settings. Audio data can be transferred over either UDP or virtual channels. The sections that follow specify when to send Data Transfer Sequence messages over UDP and when to send them over virtual channels.