> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-audit-content-webhooks.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Calling V3

> Calling V3 — CometChat documentation.

Calling is a core feature of CometChat.

## Prerequisites

1. CometChat Core SDK installed.
2. Performed the steps mentioned in the [Setup](/sdk/android/3.0/setup) guide

CometChat allows two mechanisms for calling

1. **Direct Calling**
2. **Default Calling**

## Direct Calling

Direct Calling allows you to start the call/conference sessions directly with the session Id of your choice. All the users joining the same session Id are connected to the same call/conference. For more information on Direct Calling, please visit the [Direct Calling docs](/sdk/android/3.0/direct-calling-v3).

## Default Calling

The second approach that CometChat allows is to implement the entire calling flow where one user initiates a call/conference and other user/users who want to be a part of the call accept/reject the call. All the users that accept the call are connected to the same session. For more information on Default Calling, please visit the [Default Calling docs.](/sdk/android/3.0/default-calling-v3)