I am trying to configure Win7 to mute system sounds from the CD,media player etc... to go "mute" when making or receiving calls on my Magic Jack. When I use the Google voice phone, it works perfectly. I just cannot get Win7 to treat Magic Jack the same way. Any help would be appreciated. I have selected "mute all other sounds" in the playback devices/communications window. Apparently, Win7 is not treating the MagicJack dongle as a communication device. Any help will be appreciated.