retell-ai

retell-ai

Retell AI is an LLM-based, voice-first conversational AI platform that builds, deploys, and manages humanlike AI voice agents to automate inbound and outbound phone calls at scale for support, sales, and operational teams.

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retell-ai

Retell is an LLM-based, humanlike, voice-first conversational AI platform designed to build, deploy, and manage AI voice agents for phone call automation. The platform targets large support and sales teams and enterprises that need to automate inbound and outbound calls with natural, low-latency conversations. Retell emphasizes fast setup with minimal configuration, human-quality voices, and support for complex multi-turn conversations and edge cases. Retell positions its solution as a next-generation alternative to traditional IVR and rule-based voice systems by combining proprietary voice AI orchestration, streaming retrieval-augmented generation (RAG), real-time function calling, and enterprise-grade security and compliance.

Platform to build, test, deploy, and monitor AI voice agents.

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Key Features

LLM-powered, humanlike voice agents

Third-generation voice AI that delivers natural, human-quality phone conversations powered by large language models and proprietary voice orchestration.

Low latency (~600ms)

Independent benchmarks referenced on the site indicate industry-leading responsiveness (~600ms) for smooth, fluent conversations.

Ultra-realistic voices & turn-taking

Voices built from real performance data with a proprietary turn-taking model that knows when to speak and when to listen.

Drag-and-drop agentic framework

Highly configurable design framework for building reliable conversational call flows with built-in guardrails and control over agent behavior.

Real-time function calling

Preset and custom functions can be added to call flows so agents can book appointments, process payments, update records, and transfer calls in real time.

Streaming RAG and knowledge auto-sync

Streaming retrieval-augmented generation with automatic synchronization to a knowledge base to ensure accurate, up-to-date answers during calls.

Comprehensive agent testing & simulation

Built-in simulation and testing to validate agent behaviour, accuracy, and reliability across real-world scenarios before launch.

Continuous QA and post-call analysis

Continuous quality assurance to review past calls, surface failure patterns, and provide actionable insights for ongoing improvement.

Performance analytics dashboard

Custom charts and dashboards to analyze call outcomes, agent performance, and business impact.

Telephony features (SIP trunking, branded ID, verified numbers)

Support for SIP trunking to connect existing phone numbers or VOIP providers, Branded Call ID, verified phone numbers, and batch calling with conversion tracking.

Batch calling

Run batch call campaigns without concurrency limits and access detailed conversion tracking after campaigns.

Enterprise security & compliance controls

Controls such as SSO, role-based access, PII redaction, configurable data retention, and on-prem deployment options for strict security and data residency requirements.

Implementation services

Professional FDE-led implementation services to support secure and smooth deployments at enterprise scale.

Inbound & outbound call handling

Agents can handle inbound support and routing, and place outbound calls for reminders, confirmations, lead qualification, surveys, and follow-ups.

Integrations & API

Omni-channel support including voice, chat, SMS, and a flexible API to build and orchestrate custom communication experiences.

Pricing

Free Tier Available

New accounts receive $10 of free usage on sign-up (site-stated free usage). Full pricing details are referenced on the site but specific plan pricing is not listed in the supplied content.

Use Cases

AI Receptionist

Automates incoming calls, routes callers, answers routine questions, and books appointments without live agents.

Appointment Setter

Handles scheduling and confirmations, integrates with calendars and booking workflows to reduce no-shows and increase utilization.

Lead Qualification

Conducts outbound or inbound qualification conversations to identify viable leads and hand off to sales when needed.

AI Customer Service

Answers support questions, performs lookups and updates, and escalates to humans only for complex issues.

Debt Collection / Reminders

Performs compliant outbound reminders and collection outreach while logging outcomes and updating systems in real time.

AI Dispatch Service

Coordinates dispatch workflows and updates systems during calls for logistics and field services.

Surveys & Follow-ups

Runs surveys, follow-up calls, and confirmations at scale with outcome tracking and analytics.

AI IVR & Call Routing

Replaces traditional IVR with natural conversational routing that handles complex, multi-turn interactions and edge cases.

Integrations

Twilio

Listed integration for telephony connectivity and outbound/inbound call orchestration.

Vonage

Listed telephony integration to connect voice services to Retell agents.

Go High Level

Listed integration for connecting marketing/CRM workflows with Retell agents.

n8n

Listed workflow automation integration to orchestrate data and actions within call flows.

HubSpot

Listed CRM integration to read and update customer records during calls.

Make (Integromat)

Listed workflow automation integration for custom data and process orchestration.

Zapier

Listed integration to connect Retell with a wide range of third-party apps and automations.

Salesforce

Listed CRM integration enabling agents to access and update Salesforce records during calls.

Avaya

Listed contact center/telephony integration for enterprise voice systems.

Genesys

Listed contact center integration to integrate Retell agents with Genesys platforms.

Five9

Listed contact center integration for cloud telephony interoperability.

Amazon Connect

Listed cloud contact center integration to enable voice interactions via Amazon Connect.

Telnyx

Listed telephony integration for SIP and phone number management.

Cal.com

Listed integration for calendaring and appointment booking workflows.

Benefits

Human-quality, low-latency phone conversations that keep interactions natural and fluent (~600ms latency referenced).
Fast setup with minimal configuration — launch agents in weeks rather than months using a drag-and-drop framework.
Handles edge cases and multi-turn dialogs reliably, reducing transfers and improving automation coverage.
Enterprise-grade security and compliance (HIPAA, SOC2 Type II, GDPR) with controls like SSO, role-based access, and PII redaction.
Scales to handle millions of calls with battle-tested infrastructure and on-prem deployment options for strict data residency.
Measurable business impact demonstrated in case studies (examples on the site include increases in scheduling NPS, reduced support costs, and increased revenue capture).

Limitations

For outbound calling, customers are responsible for following applicable consent and disclosure rules in their region and industry (site-stated requirement).

Frequently Asked Questions

What is an AI voice agent?
An AI voice agent is an autonomous system that can listen, speak, and hold natural phone conversations like a human. It uses speech recognition, large language models, and text-to-speech technology to understand callers, respond intelligently, maintain context, and take actions such as booking appointments or updating systems without relying on rigid scripts or human intervention.
How do Retell AI voice agents work?
Retell AI is a real-time conversational AI platform that uses proprietary voice AI orchestration with low-latency speech recognition, LLM-powered conversation understanding, and real-time function calling. The platform features ~600ms latency, ultra-realistic voices built from real performance data, and proprietary turn-taking models that know when to speak and listen.
How do I create AI voice agent with Retell AI?
Sign up for a free account on the Retell dashboard (new accounts receive $10 of free usage). From there, you can customize and configure your AI voice agent and integrate it with your company’s data and workflows.
Can I connect agent to my existing phone number?
Yes. Retell supports integration with any telephony system through SIP trunking, making it easy to connect your existing phone number and deploy AI-powered answering services or AI IVR without changing infrastructure.
What is an AI call center powered by Retell AI?
An AI call center built on Retell AI is a next-generation voice automation platform that deploys LLM-based, humanlike voice agents to handle inbound and outbound calls at scale. Agents can function as AI receptionists, IVR systems, and outbound telemarketing agents while managing phone-based interactions with natural conversations and autonomous task execution.
How is an AI call center different from a traditional call center?
A traditional call center requires humans for every call; an AI call center uses voice agents to handle routine calls autonomously so human teams step in only when needed. Retell’s agents run 24/7, scale with demand without extra hiring, and transfer complex calls to live agents when necessary.
What can Retell's AI phone calls do?
Retell agents handle inbound calls (answering support questions, routing callers, and booking appointments) and outbound calls (reminders, confirmations, lead qualification, surveys, and follow-ups). Each call can read and update CRMs, calendars, and other records in real time and log the outcome automatically.
What is an AI calling agent?
An AI calling agent is an AI voice agent that runs phone calls for you, both answering inbound and placing outbound calls. The agent holds natural conversations, completes tasks, records outcomes, and can hand the call to a live agent at any point.
Is AI calling compliant and secure?
Retell is SOC 2 Type II certified and HIPAA-compliant, with a self-serve BAA available on every plan. Built-in controls include role-based access, automatic PII redaction, and configurable data retention. Customers are responsible for following consent and disclosure rules applicable to outbound calling in their region and industry.

Getting Started

  1. 1 Step 1: Sign up for a free Retell account on the dashboard (site states new accounts receive $10 of free usage).
  2. 2 Step 2: Configure and customize an AI voice agent using the drag-and-drop agentic framework and connect required data sources or knowledge base (auto-sync available).
  3. 3 Step 3: Connect telephony via SIP trunking or existing VOIP provider, test agents using built-in simulation/testing, then deploy and monitor calls with analytics and continuous QA.

Support

Documentation

Developer and product documentation is listed on the site under 'Documentation' for guidance on building and integrating agents.

Contact Sales

The site references a 'Contact Sales' option to inquire about enterprise plans, implementation services, and demos.

Status Page

A status page is provided (listed on the site) to check system status and operational health.

Community

Community resources such as Discord and other community links are referenced for user engagement and support.

Blog & Changelog

Product updates, changelogs, and articles are available via the site's Blog and Changelog sections.

API

Available: Yes
Documentation:

API and developer documentation is available via the site's Documentation resources (listed under 'For Developers').

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