there are two ways to integrate this widget to a web application:
Just add following the following code to a website's header. It will create a widget in your website.
<script>
(function() {
var rcs = document.createElement("script");
rcs.src = "https://ringcentral.github.io/engage-voice-embeddable/adapter.js";
var rcs0 = document.getElementsByTagName("script")[0];
rcs0.parentNode.insertBefore(rcs, rcs0);
})();
</script>
Create a iframe with the following code:
<iframe width="300" height="500" id="engage-voice-embeddable-adapter-frame" allow="microphone" src="https://ringcentral.github.io/engage-voice-embeddable/app.html">
</iframe>