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Voice JavaScript SDK: Version 1.x (Deprecated)



You're viewing the 1.X version of the Voice JavaScript SDK (formerly called Twilio Client). Click here for information on how to migrate to the 2.X version.


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The Voice JavaScript SDK allows you to make voice calls to and from a web browser via a TwiML Voice 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.



Want to get started right away? Jump straight in with our Twilio Voice JavaScript Quickstart.

When you include the Voice JavaScript SDK in a web application you get access to these objects:

  • Twilio.Device: This object is your main entry point for creating outbound connections, accepting incoming connections, and setting up your connection event handlers.

  • Twilio.Connection: This object lets you interact with the call as it is happening. You can do things like mute/unmute, disconnect the call, or send DTMF tones using the connection.

Including the JavaScript SDK in your project

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You can also build twilio.js (the JavaScript SDK) from the source code(link takes you to an external page).

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