---
title: Introduction
slug: voice-apis/introduction
docTags: 
createdAt: 2025-09-29T15:20:53.184Z
---



**Introduction**

Exotel Webrtc SDK library enables you to add the voip calling feature into your web app. This document outlines the integration and usage. The Exotel Webrtc SDK package is layered. We have web-client-sdk that provides higher level APIs and callbacks to register/unregister, receive calls and operate on calls like mute/unmute, hold/unhold. And we have webrtc-core-sdk that provides the underlying state machine and SIP protocol stack.  

The current document provides API and Callback details for the web-client-sdk.



**Licensing** 

You need an *exotel* account to use the voip calling functionality with this websdk. Contact *exotel support* for demo and account creation.

:::BlockQuote
Exotel organization npm account : `@exotel-npm-dev`
:::

For using the above organizational account for publishing , an invitation will be required. And for the same please contact the account manager or hello\@exotel.com

**Glossary**

| **Terminology** | **Description**                                          |
| --------------- | -------------------------------------------------------- |
| App             | Web Application                                          |
| VOIP            | Voice over IP                                            |
| Client          | User / Subscriber / Client signing up to use the web app |
| Customer        | Exotel’s customer licensing the SDK                      |