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

# VoiceInfra Documentation

> Deploy AI voice agents on your existing phone system in minutes. Connect to 3CX, Yeastar, FreePBX, Twilio, Telnyx, and 100+ integrations.

VoiceInfra is a PBX-native conversational AI platform that lets you deploy AI voice agents as extensions on any major phone system — without changing your carrier, porting numbers, or touching your infrastructure. This documentation covers everything you need to build, configure, and deploy production-ready AI voice agents.

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/docs/quickstart">
    Deploy your first AI voice agent in under 5 minutes
  </Card>

  <Card title="Build an Agent" icon="robot" href="/docs/agents/no-code-builder">
    Use the no-code wizard or visual workflow builder
  </Card>

  <Card title="Connect Your Phone System" icon="phone" href="/docs/channels/pbx-extensions">
    Register AI agents as PBX extensions on 3CX, Yeastar, and more
  </Card>

  <Card title="API Reference" icon="code" href="/docs/api/overview">
    Trigger outbound calls and receive call data programmatically
  </Card>
</CardGroup>

## What you can build

VoiceInfra handles the full voice AI stack — telephony, speech recognition, language models, text-to-speech, and real-time integrations — so you can focus on building agents that work for your business.

<CardGroup cols={3}>
  <Card title="Inbound Receptionists" icon="headset">
    Answer every call 24/7 with an AI agent that books appointments, answers FAQs, and transfers to the right team
  </Card>

  <Card title="Outbound Campaigns" icon="bullhorn">
    Launch batch calling campaigns to thousands of contacts with personalized AI conversations
  </Card>

  <Card title="CRM Automation" icon="database">
    Update Salesforce, HubSpot, or Zoho records in real time during live calls
  </Card>
</CardGroup>

## Key capabilities

* **PBX-native deployment** — Register AI agents as extensions on 3CX, Yeastar, FreePBX, Avaya, Cisco, or Mitel. Zero hardware changes.
* **No-code agent builder** — Build production-ready agents with a guided wizard and industry templates. No prompt engineering required.
* **Multi-LLM support** — Run agents on OpenAI, Anthropic, Google Gemini, Groq, or Mistral. Switch anytime.
* **Real-time actions** — Book appointments, update CRM records, and trigger workflows during live calls via MCP or custom functions.
* **Smart call transfers** — Cold, warm, and attended warm transfers with human agent briefing.
* **30+ languages** — Automatic language detection with multilingual support built in.

## Get started

<Steps>
  <Step title="Create your account">
    Sign up at [voiceinfra.ai](https://voiceinfra.ai/signup) — you get \$10 in free credit, no card required.
  </Step>

  <Step title="Build your first agent">
    Use the [no-code wizard](/docs/agents/no-code-builder) to configure your agent's identity, behavior, and knowledge base in minutes.
  </Step>

  <Step title="Connect a phone number">
    [Import a Twilio or Telnyx number](/docs/channels/twilio), provision a new SIP number, or [register a PBX extension](/docs/channels/pbx-extensions).
  </Step>

  <Step title="Go live">
    Assign your agent to the number and start handling calls. Review transcripts, recordings, and AI summaries from the dashboard.
  </Step>
</Steps>