Turning off mute on/off feedback tones in C310 ?

Hi,

  Some users are complaining of the mute on/off feedback tones of the C310.

  Browsing plantronics.device.common.tlh I could found

    virtual HRESULT __stdcall put_MuteToneVolume (/*[in]*/ enum VolumeLevel pRetVal ) = 0;

  I suppose that is the method I should use, passing VolumeLevel_Off in.

  Seems to be part of IDeviceSettings, that is not covered in the Spokes SDK documentation

  Could anyone kindly post a C++ snippet that I could add to SpokesSDKCOMSample  to work with that interface and use that method ?

Best Regards,

Julio.