twilio.js

Twilio.js allows you to establish audio connections between a web browser and a Twilio Application. This means you can open inbound and outbound audio connections to Twilio for building soft phones, walkie-talkies, conference calls, click-to-talk systems, and more, all from the browser.

twilioaudiophoneclick-to-talk

https://www.twilio.com/docs/client/twilio-js