> For the complete documentation index, see [llms.txt](https://docs.bird.com/api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bird.com/api/voice-api/voice-calls-api.md).

# Voice Calls API

## Overview <a href="#overview" id="overview"></a>

Voice Calls API makes it possible to initiate, receive, and control voice calls using a REST API.

## API Access <a href="#api-access" id="api-access"></a>

The following API requests can only be made using a valid access key, and attached to an access role, with an access policy that at least specifies the permissions to the resources outlined in each section below. Learn more about [API access](https://docs.messagebird.com/api/api-access).