Ultravox

What is Ultravox?

Ultravox is a **voice AI platform** built on an open-weight Speech Language Model (SLM) that understands speech directly, without converting it to text first.It is designed for developers and businesses to create real-time, low-latency voice agents for telephony, web, and native applications.By removing traditional ASR and cascaded components, Ultravox reduces latency and cost while improving context awareness and naturalness in conversations.The platform is API-first, offering SDKs, tools, and a console to configure agents, integrate external tools, add RAG-based knowledge, and manage call flows.Its mission is to make production-grade, multilingual voice AI accessible and scalable, powering millions of monthly interactions for companies from startups to large enterprises.Ultravox also emphasizes flexibility with bring-your-own-telephony, cloud deployment options, and integrations into existing business systems.

How to use Ultravox?

To use Ultravox effectively, sign up on the platform, access the console, and create a voice agent by configuring language, personality, and behavior settings while optionally attaching tools (function calling) and RAG knowledge sources for domain-specific information.Connect the agent to your preferred telephony provider or web/native app using the provided REST APIs, WebSocket protocol, or SDKs, then define call flows and call stages to control how the agent handles different interaction scenarios.Use conversation history, recordings, and transcripts to monitor performance, iterate on prompts and tools, and refine agent behavior for your use case.Once tested, deploy the agent to production at scale, leveraging Ultravox’s low-latency architecture and unlimited concurrency on paid plans to handle real-world traffic.

Ultravox's Core Features

• Direct speech understanding architecture processes audio without traditional ASR, reducing latency and improving context awareness.

• Real-time, low-latency voice agents suitable for telephony, web, and native app integrations at production scale.

• Multi-lingual support for dozens of spoken languages, enabling global deployments with a single model.

• API-first platform with REST APIs, WebSockets, and SDKs for full programmatic control and custom integrations.

• Tools (function calling) that let agents interact with external systems, databases, and services during calls.

• Knowledge (RAG) capabilities to ground agents in custom documents, product data, and knowledge bases for accurate answers.

• Configurable agents and advanced call stages to design complex call flows and branching logic.

• Conversation history with audio recordings and transcripts for monitoring, QA, and analytics.

• Voice cloning functionality to create brand-consistent, natural-sounding agent voices.

• Bring Your Own Telephony model supporting major telephony providers and flexible call routing.

• High scalability with no concurrency caps on paid plans and infrastructure built for large volumes of calls.

• Integrations and webhooks for connecting Ultravox events into existing workflows, CRMs, and monitoring systems.

• Cloud deployment flexibility with support for major cloud providers to match enterprise infrastructure needs.

• Security and privacy controls including encrypted voice data, configurable retention, and compliance-oriented practices.

Ultravox's Use Cases

• #1

  Automated multilingual customer support agents handling inbound and outbound calls for common inquiries and troubleshooting.

• #2

  AI receptionists routing calls, managing bookings, and scheduling appointments for service businesses and offices.

• #3

  Sales and lead qualification agents that conduct initial discovery calls, gather data, and hand off warm leads to human reps.

• #4

  Voice agents integrated into IVR systems to replace rigid phone menus with natural conversational experiences.

• #5

  Real-time voice bots embedded in web or mobile apps for onboarding, guided workflows, or in-app assistance.

• #6

  AI-powered survey and feedback callers collecting structured responses from customers in multiple languages.

• #7

  Voice interfaces for internal tools, CRMs, or dashboards that allow staff to query data and trigger workflows via speech.

• #8

  Realistic AI voiceovers for videos, tutorials, and e-learning content using custom or cloned voices.