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 a ~600ms latency (industry-leading responsiveness), 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?

Creating a voice AI agent with Retell is easy! Sign up for a free account on the Retell dashboard, where you’ll receive $10 of free usage. From there, you can customize and configure your AI voice agent, integrating it seamlessly 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 your AI-powered answering service 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. These agents can function as AI receptionists, intelligent IVR systems, and outbound AI telemarketing agents while managing phone-based interactions with natural, human-quality conversations and autonomous task execution.

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AI Agents

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Retell AI

AI Voice Agent

Automated Calls

Human-like Conversations

Scalable Communication

Enterprise-ready

The #1 AI Voice Agent Platform for Automating Calls with Human-like Conversations.

Assistant

Customer Support

GPT-4

FREEMIUM

INTERMEDIATE Complexity

HYBRID

Last updated: May 27, 2026

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Quick Answer

Retell AI is a leading platform for building and deploying human-like AI voice agents that automate phone calls. It offers ultra-low latency, realistic voices, and advanced features like call transfer, appointment booking, and knowledge base integration. Ideal for sales, support, and operations, it helps businesses scale call volumes efficiently while maintaining high-quality, natural conversations.

Decision Intelligence

Best For

Automating customer support calls

Scaling outbound sales and lead qualification

Handling reception and dispatch services

Streamlining debt collection and notifications

Businesses requiring human-like voice AI interactions

Not Ideal For

Businesses needing only basic IVR systems without conversational AI

Organizations unwilling to manage telemarketing compliance (TCPA, DNC)

Use cases requiring deep human empathy or highly nuanced, unstructured conversations

Individuals or very small teams with minimal call volume needs

Companies seeking a fully managed, no-code solution without any integration effort

Fit Score

Complexity

INTERMEDIATE

Company Size

SMALL

MEDIUM

ENTERPRISE

Team Size

SMALL_TEAM

LARGE_TEAM

Skill Level

INTERMEDIATE

EXPERT

About Retell AI

Retell AI is a real-time conversational AI platform that enables businesses to build, deploy, and manage next-generation AI voice agents. These agents sound human, execute tasks autonomously, and scale effortlessly across various communication channels like voice, chat, and SMS. It's designed for automating customer support, sales, and operational calls.

AI-extracted from public sources. May contain errors. Methodology · Are you Retell AI? Claim listing

What Makes Retell AI Unique

Retell AI offers human-standard AI voice agents with ultra-low latency (~600ms), ultra-realistic voices, and proprietary turn-taking models for natural conversations. Its highly configurable agentic framework, real-time function calling, and streaming RAG ensure accurate and reliable performance at scale.

Capabilities

Call transfer

Appointment booking

Knowledge base integration

IVR navigation

Batch calling

Branded call ID

Verified phone numbers

Post-call analysis

Task Categories

Pros

+Industry-leading low latency for natural conversations
+Ultra-realistic and human-like AI voices
+Proprietary turn-taking model for fluent interactions
+Highly configurable agentic framework with drag-and-drop design
+Real-time function calling for task execution (e.g., booking, payments)
+Automatic knowledge base syncing with website content
+Comprehensive testing and continuous QA for agent performance
+Enterprise-grade security and compliance (HIPAA, SOC2, GDPR)

Limitations

-Requires integration with existing telephony systems or third-party platforms
-Customization and advanced configurations may require technical expertise
-Reliance on external LLMs and voice engines incurs additional usage costs
-Not suitable for highly complex, unstructured human interactions requiring deep empathy
-Compliance with telemarketing laws (TCPA, DNC) is user's responsibility

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Frequently Asked Questions

Your Actions

Dimension Scores

Ease of Use7/10

Output Quality8/10

Value for Money7/10

Customization6/10

Support7/10

Integration6/10

Task Scores

Conversation Quality

9

Response Speed

9

Context Retention

8

Knowledge Accuracy

8

Reasoning Ability

7

Personality Customization

7

Safety Controls

7

Multilingual Chat

6

Trust Score

56/100

Limited Data

Based on 9 data signals

Reflects publicly available data, not an independent audit

Social Proof10/40

Customers (per vendor website)Anker, Bill, Eufy +6

Company Strength15/25

Team Size51-200

Company ListedRetell AI Inc.

Operational Trust16/20

Uptime SLA99.5%

Status PageView

Data ResidencyGlobal deployments with options for cloud, VPC, or on-premise. Utilizes Amazon Web Services (AWS) for GDPR compliance, but does not currently operate services within the European Union. Data is encrypted at rest and in transit.

Compliance15/15

GDPR (as claimed)Yes

SOC 2 (as claimed)Yes

HIPAA (as claimed)Yes