1. Open the Terminal Services Configuration from the Administrator Tools sub-menu.
2. The first window should show a “RDP-Tcp” connection. If not, select “Connections” from the left pane. Right-click on the “RDP-Tcp” connection and select properties.
3. Choose the “Client Settings” tab and uncheck the “Audio Mapping” disable button on the bottom right side.
4. Hit OK, log out and log back in to have sound.