help | 5 Configuring Enreach Contact Desktop | Settings | Audio Settings
Audio Settings
In the section Audio Settings you can set whether you want to use the loudspeaker and microphone of your PC or Mac or a connected headset to make phone calls and how incoming calls are signalled.
To set the audio settings 
1 Click on your profile picture.
2 Click on Preferences | Audio Settings.
*Microphone
Use the dropdown-list to select which microphone you want to use for making calls
*Speaker
Use the dropdown-list to select which speaker you want to use to make calls
*Ringing
Select the ringtone output device from the dropdown-list.
3 Use the volume control to set the volume for the respective area.
4 Click on Save.