Retell AI is a platform for building, deploying and managing AI voice agents that handle inbound and outbound phone conversations and execute business tasks.

Can Retell AI agents perform actions during calls?

Yes. Agents can use functions and integrations to perform actions such as booking appointments, retrieving information, transferring calls and interacting with connected business systems.

Does Retell AI support workflows?

Yes. Retell Workflows supports pre-call and post-call functions with sequential and parallel execution based on workflow dependencies.

Can Retell AI connect to CRM systems?

Yes. Retell documents integrations with CRM platforms including Salesforce, HubSpot, Zoho CRM, Microsoft Dynamics 365 and GoHighLevel.

Does Retell AI support human handoff?

Yes. Agents can transfer conversations to human representatives, and teams can monitor calls live and take over conversations when needed.

Does Retell AI provide an MCP server?

Yes. Retell provides a hosted MCP server that lets compatible AI clients access tools for creating and managing agents, calls, phone numbers, knowledge bases, testing and QA.

How much does Retell AI cost?

AI Voice Agent usage on the pay as you go plan ranges from $0.07 to $0.31 per minute. Enterprise pricing is customized.

Can Retell AI agents use a knowledge base?

Yes. Retell supports knowledge bases that agents can use to access existing information during conversations.

Retell AI

AI voice agent platform for building, deploying and managing agents that handle inbound and outbound calls, execute workflows, use business data and automate phone based operations.

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About Retell AI

Retell AI is an AI voice agent platform for building, deploying and managing agents that handle inbound and outbound phone conversations. Agents can answer calls, place outbound calls, qualify leads, book appointments, retrieve customer information and transfer conversations to human representatives.

The platform provides a visual environment for designing call flows with functions, integrations, call transfers, DTMF, SMS and custom logic. Agents can use knowledge bases and connected business systems during conversations, while call outcomes and captured information can be written back to CRM systems.

Retell Workflows supports actions before and after calls. Pre-call functions can retrieve customer or business context and pass it into the conversation. Post-call functions can update records or trigger follow-up actions. Functions can be configured to execute sequentially or in parallel.

Retell also provides APIs, SDKs, webhooks and a hosted MCP server. These interfaces allow teams to create and update agents, launch calls, manage phone numbers and knowledge bases, inspect calls, run QA and automate agent operations programmatically.

Key Features

Voice Call Automation: Build agents that answer inbound calls and place outbound calls while handling natural conversations and business tasks.
Agentic Workflows: Execute pre-call and post-call functions with sequential or parallel dependencies.
Functions and Actions: Configure agents to book appointments, transfer calls, retrieve information and execute custom business actions.
Knowledge and Business Context: Use knowledge bases, CRM data and connected systems to provide agents with relevant information during calls.
Testing and Quality Assurance: Simulate scenarios, review transcripts, turn production calls into regression tests and evaluate call quality at scale.
Developer and MCP Access: Use APIs, SDKs, webhooks and Retell's hosted MCP server to manage agents, calls, knowledge bases, testing and operations.

Pricing

Pay as you go: $0.07 to $0.31 per minute AI Voice Agent usage with full platform access, agent templates, call analytics, transcripts, simulation testing, webhooks, API access and 20 included concurrent calls.
Enterprise: Custom pricing Includes enterprise options such as role based access control, custom SSO, custom MSA and DPA terms, higher concurrent call capacity and optional dedicated implementation support.
Additional Concurrency: $8 per concurrent call/month The first 20 concurrent active calls are included.
Retell Phone Number: $2 per phone number/month Monthly charge for Retell supplied phone numbers.
Knowledge Base: First 10 knowledge bases free, then $8 per knowledge base/month Additional knowledge bases are billed monthly after the included allowance.
Knowledge Base Usage: +$0.005 per minute Usage based add-on for knowledge base functionality.
Batch Call: +$0.005 per dial Additional charge for batch calling.
Branded Call: +$0.10 per outbound call Additional charge for branded outbound calling.

Use Cases

AI receptionist and inbound answering
Appointment scheduling and customer service
Lead qualification and outbound campaigns
Call routing, escalation and human handoff

Pros & Cons

Pros:

Supports actions during calls through functions, integrations and custom call flows.
Provides pre-call and post-call workflow execution with sequential and parallel functions.
Offers APIs, SDKs, webhooks and MCP access for programmatic agent management and operations.

Cons:

Pay as you go accounts include 20 concurrent calls, with additional capacity charged separately.
Pre-call workflow functions have execution budgets of 1 minute for inbound and web calls and 5 minutes for outbound calls before dialing.

Integrations

Twilio, Vonage, GoHighLevel, HubSpot, Salesforce, Zoho CRM, Microsoft Dynamics 365, Zendesk, Google Workspace, Calendly, Cal.com, Slack, Zapier, Make, n8n, Telnyx, SIP trunking, APIs, SDKs, webhooks, MCP, Custom LLM