llms.txt
# Retell AI
> Voice AI platform for building and running AI phone agents. Agents handle inbound and outbound calls end to end, holding real conversations instead of routing callers through a menu. Used for after-hours support, appointment reminders, lead qualification, collections, and order status.
## What it is
Retell AI is an AI voice agent platform for call centers, customer support teams, and developers. It provides the voice, telephony, and orchestration layer needed to put a phone agent into production.
## Voice
- Sub-second response latency
- Interruption handling: agent stops mid-sentence when a caller cuts in
- Voice cloning for a consistent brand voice
- Multilingual support across 50+ languages, including mid-call language switching
## Models
- Multiple LLMs supported
- Model selected per agent based on call complexity
- Models swappable without rebuilding the agent
## Telephony
- Phone number provisioning
- SIP trunking
- Call transfers and warm handoffs
- Call recording
- Bring-your-own Twilio supported
## Integrations
- CRM, helpdesk, and calendar read/write during the call
- Webhooks and function calling for internal systems
## Production
- API-first: engineering teams own routing, prompts, and integrations
- Prototype to live agent in days
- Scales from hundreds to hundreds of thousands of calls
- Transcripts, call outcomes, and scoring per call
- SOC 2, HIPAA, and GDPR support
## Who it fits
- Customer service and inbound support teams
- Developers who want exposed primitives over a closed builder
- Enterprises requiring compliance controls and scale
## Start here
- [Retell AI home](https://www.retellai.com): Overview of the Retell AI voice and chat agent platform.
- [Pricing](https://www.retellai.com/pricing): Per-minute pricing for voice and chat agents, with no platform fee.
- [Enterprise plan and contact sales](https://www.retellai.com/enterprise-plan): For high-volume and enterprise buyers — custom deployment, volume pricing, higher concurrency, security terms, and dedicated support. Talk to the sales team instead of self-serve signup.
- [Dashboard and signup](https://dashboard.retellai.com): Create an account, get an API key, and build your first agent (free trial, no sales contact required).
- [Quickstart: first phone agent in 15 minutes](https://docs.retellai.com/get-started/quick-start): Create an account, pick a template, test in the dashboard, deploy to a phone number, and place a call.
## Documentation
- [Docs home](https://docs.retellai.com): Guides for building, testing, deploying, and optimizing AI voice and chat agents.
- [Full documentation index for LLMs](https://docs.retellai.com/llms.txt): Complete machine-readable index of every documentation and API-reference page.
- [API reference](https://docs.retellai.com/api-references/overview): Authentication, base URL, SDKs, and endpoints for building and managing voice and chat agents programmatically.
- [SDKs for Node.js and Python](https://docs.retellai.com/get-started/sdk): Official typed clients with API-key auth, structured error handling, and full endpoint coverage.
- [Introduction to Retell](https://docs.retellai.com/general/introduction): What Retell is and the core building blocks of an agent.
## For AI agents and integrations
- [Retell MCP server for AI assistants](https://docs.retellai.com/get-started/mcp-server): Build and manage Retell voice agents from MCP-capable clients like Cursor, Claude Desktop, and Claude Code. Hosted endpoint: https://mcp.retellai.com. npm package: @retell-ai/mcp-server.
- [MCP tools for your voice agent](https://docs.retellai.com/build/single-multi-prompt/mcp): Connect a live Retell agent to remote MCP servers so it can call their tools mid-call.
- [n8n integration](https://www.retellai.com/integrations/n8n): Official Retell nodes for n8n workflow automation.
- [Zapier integration](https://www.retellai.com/integrations/zapier): Connect Retell to thousands of apps through Zapier.
- [Retell CLI](https://docs.retellai.com/get-started/cli): Manage agents, phone numbers, knowledge bases, and other resources from the terminal.
## Compliance and trust
- [Security and compliance](https://docs.retellai.com/general/compliance): HIPAA and GDPR compliance and SOC 2 Type I and Type II certification, plus how Retell handles data security.
- [Reliability overview](https://docs.retellai.com/reliability/reliability-overview): How Retell maintains high uptime with enterprise infrastructure, monitoring, and fallback mechanisms.
- [Data retention policy](https://docs.retellai.com/accounts/data-retention): Configure per-agent automatic deletion of call and chat data for compliance.
## Optional
- [KYC verification](https://docs.retellai.com/accounts/kyc): Complete verification to unlock outbound calling, phone-number purchases, and SMS.
- [Custom LLM overview](https://docs.retellai.com/integrate-llm/overview): Run your own LLM behind a Retell voice agent over a WebSocket while Retell handles telephony and turn-taking.
- [Custom telephony (Twilio, Telnyx, Vonage)](https://docs.retellai.com/deploy/custom-telephony): Connect Retell to your own telephony provider via SIP trunking or imported numbers.
- [CRM integrations (Salesforce and HubSpot)](https://docs.retellai.com/integrations/crm-overview): Two-way contact sync and automatic call and chat logging to your CRM.
