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Retell AI

API Reference

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🌟 Unlock the full potential of Retell AI's conversational voice AI API.

Introduction

Understand building blocks Retell provides and what you can do with them.

Quick Start

Try our voice AI in dashboard without coding

Dashboard Tutorial

Documents what can be done to reduce latency in your agent.

Reduce Latency

How to locate and address issues while developing with Retell.

Debug Guide

Overview

Language

Voice

Control and direct how the speech is generated.

Speech Controllability

Interaction Configuration

How to Properly Pronounce Phone Numbers

Understand the constraints and limitations of the agents.

Constraints & Limitations

Create Retell LLM

Prompt Engineering Guide

Function Calling Overview

How to Add Function Calling

LLM States

How to Create Multiple LLM States

Dynamic Variables

A step by step guide to create a phone call with Retell managed numbers

Retell Numbers

A step by step guide to integrate custom telephony providers

Custom Telephony

A step by step guide to create a web call with agent using frontend Web SDK

Web Call

Migration Guide

Guide on how to set up the agent to navigate the IVR.

Navigate IVR

Call Transfer

Use webhooks to receive real time events for your call.

Webhook

Custom LLM Overview

Setup WebSocket Server

Integrate LLM

Integrate Function Calling

Troubleshooting Guide

Custom LLM Best Practices

Use post-call analysis to gain insights from your calls.

Post Call Analysis

Audio Basics

Create Phone Call

Create Web Call

Get Call

List Calls

Retrieve details of a specific Retell LLM

Get Retell LLM

List Retell LLMs

Update Retell LLM

Delete Retell LLM

Create Agent

Get Agent

List Agents

Update Agent

Delete Agent

Create Phone Number

Retrieve details of a specific phone number

Get Phone Number

List Phone Numbers

Update agent bound to a purchased phone number

Update Phone Number

Delete Phone Number

Create Knowledge Base

Retrieve details of a specific knowledge base

Get Knowledge Base

List Knowledge Bases

Delete Knowledge Base

Get Voice

List Voices

Get the current concurrency and concurrency limit of the user

Get Concurrency

Import a phone number from custom telephony & Bind agents

Import Phone Number

Register a new phone call for custom telephony

Register Phone Call

Retell AI connects with your server, and get responses / actions from your custom LLM.

LLM WebSocket

Create Phone Call (Deprecated)

Register Call To Get CallId To Establish Connection

Register Call (Deprecated)

Get Call (Deprecated)

List Calls (Deprecated)

Retell AI connects with user audio source, read and send audio bytes through this WebSocket.

Get Started

Voice Agent

Retell LLM Framework

Make Calls

Advanced Features

Knowledge

Community

Network Ecosystem

General

Affiliate Program

How to Apply

Apply for Retell Affiliate Program

How to get Retell Logos

Retell Logos

Get Started

Voice Agent

Retell LLM Framework

Make Calls

Advanced Features

Knowledge

Community

Network Ecosystem

General

​How to Apply

Apply for Retell Affiliate Program

​How to get Retell Logos

Retell Logos

How to Apply

How to get Retell Logos