> ## Documentation Index
> Fetch the complete documentation index at: https://developers.cloudtalk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# CloudTalk Developer Documentation

> The complete API reference and developer guides for CloudTalk's cloud call center and business calling platform.

CloudTalk gives engineering teams a REST API to automate call center operations — managing calls, contacts, agents, numbers, SMS, campaigns, and AI-powered conversation intelligence. This documentation covers everything you need to integrate with CloudTalk API v1.7.

<CardGroup cols={2}>
  <Card title="Introduction" icon="book-open" href="/guides/introduction">
    Overview of the CloudTalk API, its capabilities, and how it works.
  </Card>

  <Card title="Quickstart" icon="rocket" href="/guides/quickstart">
    Make your first API call in under 5 minutes.
  </Card>

  <Card title="Authentication" icon="key" href="/guides/authentication">
    Set up HTTP Basic Auth with your API keys.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/overview">
    Full reference for every endpoint, with live playground.
  </Card>
</CardGroup>

## What You Can Build

<CardGroup cols={3}>
  <Card title="Call Automation" icon="phone">
    Trigger outbound calls, fetch call history, download recordings, and access real-time call flow data.
  </Card>

  <Card title="Contact Management" icon="address-book">
    Create and sync contacts, manage tags, notes, activities, and custom attributes.
  </Card>

  <Card title="AI Insights" icon="brain">
    Pull transcriptions, sentiment analysis, smart notes, topics, and talk-listen ratios from calls.
  </Card>

  <Card title="SMS & WhatsApp" icon="comment-sms">
    Send SMS and WhatsApp messages programmatically from your CloudTalk numbers.
  </Card>

  <Card title="VoiceAgent" icon="robot">
    Initiate AI-powered voice agent calls using your configured VoiceAgent IDs.
  </Card>
</CardGroup>

## Explore the API

<CardGroup cols={2}>
  <Card title="API Concepts" icon="layer-group" href="/guides/response-envelopes">
    Learn about response envelopes, pagination, error codes, and rate limiting.
  </Card>
</CardGroup>


## Related topics

- [CloudTalk REST API v1.7 — Complete Developer Reference](/api-reference/overview.md)
- [Quickstart: Connect Your AI Assistant to CloudTalk](/guides/mcp/quickstart.md)
- [CloudTalk API HTTP Error Codes: Causes and Resolutions](/guides/error-codes.md)