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Both speakerDevices and ringtoneDevices properties of Twilio.Device.audio are instances of AudioOutputCollection . These AudioOutputCollections represent active audio devices, and can be updated to redirect speaker and ringtone sounds to different devices in realtime.
The following is a list of methods available on AudioOutputCollection instances:
Get a Set containing MediaDeviceInfo objects representing the active devices in the collection.
Replace the active devices in the collection by passing one or more device IDs. Returns a Promise, which is fulfilled if the device(s) were set successfully and rejected if:
Test the active devices by playing a sound through them. Optionally, a URL can be passed to play a custom test sound. Returns a Promise, which is fulfilled if the devices were set successfully and rejected if:
Audio selection requires the setSinkId functionality which, at the time of writing, is only supported in Chrome 49.0 and above; as Firefox and Edge add support for these APIs, twilio.js will be able to automatically make use of them.
If unsupported, the get method will return an empty Set , whereas the set and test methods will return a rejected Promise.