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

# Platform Overview

> Understand Retone AI's architecture and core capabilities

## What is Retone AI?

Retone AI is a voice AI agent platform that enables businesses to build, deploy, and manage sophisticated AI-powered phone agents. These agents can handle inbound and outbound calls, engage in natural conversations, collect information, book appointments, and seamlessly transfer to human agents when needed.

## Core Concepts

### Flow Agents

Flow Agents are AI-powered entities that handle your phone conversations using a visual, node-based design. Build sophisticated conversation flows with:

* **Multi-step processes** - Guide callers through complex workflows
* **Data collection** - Gather and validate customer information
* **Conditional routing** - Branch conversations based on user input
* **Appointment booking** - Schedule meetings directly in calls
* **Human transfer** - Seamlessly escalate to live agents

### The AI Stack

Retone AI integrates best-in-class providers for each component of the voice AI pipeline:

| Component                | Providers                    | Purpose                                    |
| ------------------------ | ---------------------------- | ------------------------------------------ |
| **Speech-to-Text (STT)** | Deepgram Flux, AssemblyAI    | Convert caller speech to text in real-time |
| **Language Model (LLM)** | Groq, OpenAI, Anthropic      | Generate intelligent, contextual responses |
| **Text-to-Speech (TTS)** | Cartesia Sonic 3, ElevenLabs | Convert agent responses to natural speech  |
| **Telephony**            | Twilio, LiveKit SIP          | Handle phone connections and call routing  |

### Flow Builder

The Flow Builder is a visual canvas for designing conversation flows. Instead of writing one large prompt, you create a graph of **nodes** connected by **transitions**.

```
[Start] → [Greeting] → [Collect Info] → [If/Else] → [Book] or [Transfer]
                                            ↓
                                        [End Call]
```

**Node Types:**

* **Start** - Entry point for conversations
* **Conversation** - AI-powered dialogue stages
* **Data Extraction** - Collect and validate information
* **If/Else** - Branch based on conditions
* **Calendar Booking** - Schedule appointments
* **Human Transfer** - Connect to live agents
* **Agent Transfer** - Hand off to another AI agent
* **Function** - Execute custom backend logic
* **End Call** - Terminate the conversation

### Knowledge Base

Power your agents with your own data using RAG (Retrieval-Augmented Generation):

* **Upload Documents** - PDF, TXT, DOCX files
* **Scrape Websites** - Import content from web pages
* **Organize in Folders** - Group related content
* **Link to Agents** - Attach specific knowledge to agents or flow nodes

When a caller asks a question, the agent searches your knowledge base and incorporates relevant information into its response.

## Architecture Overview

```
                    ┌─────────────────────────────────────────┐
                    │              Phone Call                  │
                    └─────────────────┬───────────────────────┘
                                      │
                    ┌─────────────────▼───────────────────────┐
                    │         Telephony (SIP/Twilio)          │
                    └─────────────────┬───────────────────────┘
                                      │
          ┌───────────────────────────┼───────────────────────────┐
          │                           │                           │
          ▼                           ▼                           ▼
    ┌───────────┐             ┌───────────────┐            ┌───────────┐
    │    STT    │             │  Voice Agent  │            │    TTS    │
    │ (Deepgram)│────────────▶│   (LLM +      │───────────▶│(Cartesia) │
    └───────────┘             │  Flow Logic)  │            └───────────┘
                              └───────┬───────┘
                                      │
                    ┌─────────────────┼─────────────────┐
                    │                 │                 │
                    ▼                 ▼                 ▼
             ┌───────────┐    ┌───────────┐     ┌───────────┐
             │ Knowledge │    │  Calendar │     │  Actions  │
             │   Base    │    │  System   │     │ (Transfer)│
             └───────────┘    └───────────┘     └───────────┘
```

## Key Features

### Telephony

* Provision phone numbers directly in the platform
* Import existing Twilio or SIP trunk numbers
* Handle inbound and outbound calls
* Call recording with configurable retention

### Call Transfers

* **Warm Transfer** - Brief the human agent before connecting
* **Time Restrictions** - Route based on business hours
* **Fallback Handling** - Graceful handling when transfers unavailable

### Data Extraction

* Collect structured information during calls
* Validate with regex patterns (email, phone, custom formats)
* Support for multiple data types (text, number, date, boolean, select)

### Analytics

* Call volume and duration metrics
* Success rate tracking
* Sentiment analysis
* Peak hours identification
* Export capabilities

### Security

* Encrypted SIP credentials
* Organization-level isolation
* Role-based access control
* Call recording controls

## Getting Started

Ready to build your first voice agent?

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/quickstart">
    Create an agent in 5 minutes
  </Card>

  <Card title="Flow Builder Guide" icon="diagram-project" href="/flow-builder/overview">
    Learn visual conversation design
  </Card>
</CardGroup>