31006: Audio device error

Twilio raises this Voice error when it can't start the audio device.

• The browser has not been granted microphone access.
• A USB headset is disconnected or faulty.
• Headset driver issues are preventing the audio device from starting.

• Ask for microphone access before you create the Device object by calling navigator.mediaDevices.getUserMedia({ audio: true }), and stop the tracks right away if you only need the device list. This helps surface getUserMedia errors early.
• Update your device picker when device.audio.on('deviceChange', ...) fires so the UI reflects microphones or headsets that are plugged in, unplugged, or relabeled.
• If users select a specific microphone, call device.audio.setInputDevice() before device.connect() or call.accept(), then call device.audio.unsetInputDevice() after the call disconnects so future calls can fall back to the default input device.
• If you use Flex, keep initial audio device check enabled so Flex verifies device health at startup, on browser refresh, and when the available device list changes.

• Voice JavaScript SDK: Best Practices
• Twilio.Device.audio
• Initial Audio Device Check