1.3.2 Audio Redirection Protocol
Remote Desktop Protocol: Audio Output Virtual Channel Extension is divided into three distinct sequences:
Initialization Sequence (section 1.3.2.1)
The connection is established and capabilities and settings are exchanged.
Data Transfer Sequences (section 1.3.2.2)
Audio data is transferred.
Audio Setting Transfer Sequences (section 1.3.2.3)
Changes to audio settings are transferred.