CounterPath Bria 3.5.1 for Windows User Guide - Retail Deployments - Manual (Page 81)

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A Troubleshooting
Choose Help > Troubleshooting to display the Troubleshooting window.
Testing Audio Devices
You can verify that your microphone and speakers are working and can set the volume to a comfortable level
without having to actually place a phone call.
Testing Audio Quality
While you are on a phone call, you can test the quality of the audio. Note that to perform a valid test, you should
be on an established call (not a call attempt).