X-API-Key

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apiKeyAuth

Ultravox Realtime

Key concepts to understand before building a voice AI agent.

It's All Prompting

There is no ASR

Tools are Just Functions

The Start Call 2-Step

Ultravox Realtime is Fast and Cheap

Prompting Guide

Connect outoing Twilio calls to an Ultravox agent in 5 minutes or less.

Outgoing Phone Calls

Connect incoming calls to an AI agent in 6 minutes.

Incoming Phone Calls

Build and Deploy an Agent to the Browser in 5 Minutes

Web Quickstart

Creating an API Key

Give your agents additional capabilities while maintaining a natural conversation flow.

Using Tools

Give you agent access to product documents, KBs, and more.

Adding Knowledge (RAG)

Ultravox Client SDK for building user-facing experiences.

SDKs

Use Ultravox to make and receive calls using WebRTC, via Telnyx, Twilio, or Plivo.

Telephony

Voice Cloning

Multilingual Agents

Create dynamic, multi-stage conversations.

Call Stages

Debugging & Troubleshooting

Integrate with your server via direct WebSocket connections.

WebSocket Integration

Receive real-time notifications from Ultravox.

Webhooks

Ultravox REST API Overview

List Accounts

Returns account details for a single account

Get Account

List API Keys

Get API Key

Create API key

Updates an API key via replacement. Revokes the existing key.

Replace API Key

Update API key

Delete API Key

Calls Overview

List Calls

Get Call

Creates a new call using the specified system prompt and other properties

Create Call

Returns all messages generated during the given call

List Call Messages

Returns all tools that were available at any point during the call

List Call Tools

Returns a link to the recording of the call

Get Call Recording

Lists all stages that occurred during the specified call

List Call Stages

Retrieves details for a specific stage of a call

Get Call Stage

Returns all messages that were exchanged during a specific stage of a call

List Call Stage Messages

Returns all tools that were available during a specific stage of a call

List Call Stage Tools

List Tools

Get Tool

Create Tool

Update Tool

Delete Tool

List Voices

Get Voice

Create (Clone) Voice

Retrieves all webhooks configured on an account

List Webhooks

Gets details for the specified webhook configuration

Get Webhook

Creates a new webhook configuration for an account

Create Webhook

Replaces the specified webhook configuration

Replace Webhook

Updates the specified webhook configuration

Update Webhook

Deletes the specified webhook configuration

Delete Webhook

Base Tool Definition

Retrieves the list of all available models that can be used for inference

List Models

Gets the OpenAPI schema for the Ultravox REST API

Get OpenAPI Schema

Ultravox Client SDK

Stay informed about Ultravox platform announcements.

News & Updates

Track upcoming breaking changes, migration timelines, and deprecation notices for the Ultravox platform.

Accounts & API Keys

Calls, Messages, Stages

Tools

Voices

Webhooks

Schema

Other

Delete Voice

Authorizations

Path Parameters