Not every browser on every operating system supports access to the microphone in order to capture audio.

Browser Support

Below are the list of browser which we have tested that do and don't allow streaming audio from the microphone, ordered by Operating System.

Some additional information can be viewed at https://caniuse.com/#feat=stream

Browser	Max OS X	Windows	iOS	Android	Linux
Chrome	✅	✅	❌	✅	✅
Firefox	✅	✅	-	-	✅
Safari	✅	-	✅	-	-
Internet Explorer	-	❌	-	-	-
Microsoft Edge	-	✅	-	-	-

Notes

- in the above table means the browser was not available/not tested on the platform specified.

Internet Explorer

Microsoft have stated that web audio streaming won't be added to Internet Explorer. The latest version available at the time of testing was 11.

iOS

Only iOS 11 or later supports web audio streaming - no browser on any prior version of iOS will work.
At the time of testing, only Safari supported web audio streaming. Chrome (61.0) does not support audio streaming.

JavaScript Method

A method is available in the Voysis JavaScript library, isStreamingAudioSupported, to help developers determine if the current browser will support streaming audio from a microphone:

if (!VoysisSession.isStreamingAudioSupported()) {
    alert('Browser not supported');
}