版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/twilio.js/1.2.0/twilio.min.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.