---
title: Introduction and Glossary
slug: voice-apis/introduction-and-glossary
docTags: 
createdAt: 2025-10-03T03:59:36.200Z
---



### Introduction

ExotelVoice library enables you to add the voip calling feature into your app. This document outlines the integration steps. The library supports only peer to peer 2-way calls. Multi-party conferencing use cases are not supported. 

*Section 4* describes integration steps for ExotelVoice Android SDK. *Section 5.1* describes the webhooks that should be supported in your application backend for number-masking workflow.  *Section 5.2.1* describes subscribers  provisioning in the Exotel platform.

### Licensing

Create a trial *account* in Exotel. To enable voip calling in the trial account, contact **exotel support**. Once Exotel support enables the voip capability in the account , a VOIP Exophone will be created as shown below and available in the account under the Exophones section  . 

![](https://api.archbee.com/api/optimize/SK2urIgCC2ml99YyqWOSl/csGk37kqH5Vc7BmY_F6Jp_.blob)

SIP Exophones discussed later in the section refers to Exophones of Voip type as shown above.

**NOTE :- SIP and VOIP are used interchangeably in the document**

### Glossary



| Terminology         | Description                                                  |
| ------------------- | ------------------------------------------------------------ |
| App                 | Mobile application                                           |
| Application Backend | Customer backend service for the application                 |
| Client              | User / Subscriber / Client signing up to use the mobile app  |
| Customer            | Exotel’s customer licensing the SDK                          |
| Voip                | Voice over IP                                                |