Code to disable Mute On/Mute Off Voice prompt using SDK API for Voyager pro

IDeviceSettings ds = m_device.HostCommand as IDeviceSettings;
// disable tones:
ds.MuteToneVolume = VolumeLevel.Off;

// enable tones:
ds.MuteToneVolume = VolumeLevel.Low;

where m_device is an object to IDevice