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Voice API

Deploy seamless communication experiences with developer-friendly APIs, transparent pricing, and scalable infrastructure built for global voice applications.

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WHY TELNYX?

Why leading companies choose Telynx Voice API

Whether you're adding voice to your product, launching a contact center, or building a voice AI agent, Telnyx gives you the control and performance to move fast globally with low-cost pricing. Use our flexible Voice APIs to power customer calling, recording and real-time call flows.

Features

Powerful Voice API features

Telnyx Voice API gives developers everything they need to build scalable, reliable and programmable voice infrastructure, including AI powered call flows.

Bi-directional streaming from client to server and server to client

Stream bi-directional RTP audio over secure WebSockets. Ideal for voice-AI assistants and real-time coaching platforms that analyse speech on the fly and deliver instant, context-aware feedback.

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Convert voice to text in real-time with low-latency, high accuracy engines from Telnyx or Google and automatic speaker separation for clear multi-party transcripts.

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Play dynamic, natural-sounding voices in 40+ languages and accents using synthesized speech.

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Add voice agents to any call in minutes by chaining TTS, STT, and LLM logic via simple AI Gather and AI Assistant commands.

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Call escalation-call operators image

Take full control of every leg of a call with one-line API commands. Route callers, move them between endpoints, or cleanly end sessions in real time.

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Click to Call Image- Women typing on laptop

Easily integrate calling into your web and mobile applications with the power of WebRTC. Our Voice SDKs are available for web, iOS, and Android.

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PRICING

See our Voice API pricing

Customers can save up to 50% by switching to Telnyx with lower per-minute rates, automatic volume discounts, and no hidden fees.

Starting at

$0.002

per minute
See pricing

140+

countries supported

25M+

API requests daily

10M+

call minutes per day

VOICE API FOR DEVELOPERS

Build smarter voice applications with flexible APIs

Build and deploy your customized voice experiences. With Telnyx’s REST APIs, you can effortlessly create dynamic call flows and integrate AI into the mix without telephony expertise. With detailed developer documents and 24/7 support your team can go from prototype to production easily. Go to market fast, scale rapidly, and keep your focus entirely on innovation.

Explore Dev Docs

Make a phone call

curl -i -X POST "https://api.telnyx.com/v2/calls" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_TELNYX_API_KEY" \
-d '{
  "connection_id": "YOUR_CONNECTION_ID",
  "to": "+15551234567",
  "from": "+15557654321",
  "webhook_url": "https://your-webhook.url/events"
}'
UJET CTO Dave Bullock and coworker behind the UJET logo
CUSTOMER STORIES

Powering UJET's global voice expansion

UJET leveraged Telnyx’s TeXML Voice API and mobile WebRTC SDKs to launch compliant, high-quality voice services in Canada with features like call recording and real-time media streaming. With support from Telnyx’s global network and collaborative engineering, they scaled reliable contact center experiences worldwide.


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Use cases

Build smarter apps with programmable voice

Sign up and start building.

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FAQ

A Voice API is a tool that developers use to make and receive phone calls using an Application Programming Interface (API). A Voice API connects internet-based applications to the Public Switched Telephone Network (PSTN).

A Voice API is a tool that developers use to make and receive phone calls using an Application Programming Interface (API). A Voice API connects internet-based applications to the Public Switched Telephone Network (PSTN).

Resources, Docs, Support

Voice Api hub

Find tips, best practices, and guides for Voice Api

  • Article icon

    Telnyx Voice Product Suites Overview | Telnyx

    Telnyx Voice Product Suites Overview

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  • Article icon

    Telnyx Programmable Voice | Telnyx

    Telnyx's Developer Portal is your one-stop shop for all things Programmable Voice. From here you can learn how to get started, explore our API reference, and find code samples and other resources.

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  • Article icon

    Fundamentals | Telnyx

    Overview

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  • Article icon

    Voice API Commands and Resources | Telnyx

    The following endpoints can be used with the Voice API applications.

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    Webhooks | Telnyx

    Overview

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    Voice APIs | Telnyx

    Our Voice products make it possible for you to programmatically manage calls, manage outbound voice traffic, and send/receive faxes.

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  • Article icon

    List call control applications API | Telnyx

    Return a list of call control applications.

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  • Article icon

    Retrieve a phone number with voice settings API | Telnyx

    Retrieve a phone number with voice settings

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  • Article icon

    List connections API | Telnyx

    Returns a list of your connections irrespective of type.

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  • Article icon

    Dial API | Telnyx

    Dial a number or SIP URI from a given connection. A successful response will include a call_leg_id which can be used to correlate the command with subsequent webhooks.

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  • Article icon

    What is Voice API? Programmable Voice Explained

    What is a voice API? Our comprehensive guide to programmable voice for developers breaks down cost, use cases, and incredible voice API features.

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    Call Control : Telnyx Launches New Programmable Voice API

    The Telnyx voice API allows customers to connect and control calls programmatically, all over the globe.

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  • Article icon

    Telnyx Voice API vs. TeXML: What’s the difference?

    You can use either Telnyx Voice API or TeXML to build advanced voice capabilities into your applications. Learn which tool is right for your project.

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  • Article icon

    Customer spotlight: Using Telnyx Voice API with OpenAI

    A developer in Turkey leveraged Telnyx and OpenAI to call thousands of pharmacies to find medication during a shortage.

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  • Article icon

    ChatGPT Voice API vs. Telnyx: Best voice API for business

    Compare ChatGPT Voice API and Telnyx Voice API to find the best option for business communications. Explore features, pricing, and real-time AI capabilities.

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  • Article icon

    Telnyx vs Twilio: Voice API comparison for 2025

    Telnyx vs Twilio: See which voice API gives you lower latency, better pricing, and full-stack control for global communications.

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  • Article icon

    Foundational tools for building future-ready voice solutions

    Learn what your organization needs to build innovative voice solutions that will meet the demands of modern businesses and consumers.

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  • Article icon

    [Video walkthrough] Getting started with Telnyx Voice API

    Join VP of Business Development Mclain Roth as he walks through the setup steps to get started using Telnyx Voice API (Call Control).

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  • Article icon

    How AI-powered voice tools elevate customer conversations

    Learn how voice AI is changing customer communication, improving efficiency, and reducing costs.

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  • Article icon

    Voice AI Agents—Quickly build and launch | Ultra-low latency

    Build and launch powerful Voice AI Agents faster and cheaper with Telnyx. Ultra-low latency, unmatched call quality, total control.

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  • Article icon

    The Better Twilio Alternative - Telnyx

    Switch to Telnyx for a better Twilio alternative. Benefit from our competitive pricing, private global network, and award-winning support.

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  • Article icon

    The better Vonage Voice API alternative - Telnyx

    Switch to Telnyx for a better Vonage voice alternative. Benefit from our global coverage, excellent support, and flexible APIs..

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  • Article icon

    Voice API Essentials | Telnyx Help Center

    In this collection you will find helpful links that explain the mission control portal features and troubleshooting tips.

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  • Article icon

    General Voice API Help | Telnyx Help Center

    Get assistance with Telnyx's Voice API: UK TPS, Google Verified Calls, STIR/SHAKEN.

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  • Article icon

    Configuring Call Control/TeXML Applications - Voice API | Telnyx Help Center

    This article describes the in-depth setup of Call Control / TeXML Applications on our Mission Control Portal.

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  • Article icon

    TeXML and Telnyx Voice API compatibility | Telnyx Help Center

    Avoid combining TeXML and Call Control commands in the same application

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  • Article icon

    Telnyx Tech Specs | Telnyx Help Center

    Here you will find out key tech specs at Telnyx and what they mean for our service.

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  • Article icon

    API Keys and How to Use Them | Telnyx Help Center

    In this article we will explain API keys and how to use them with both API v2 and API v1.

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  • Article icon

    Streamline Call Control workflows with Telnyx Flow

    Create highly customizable Call Control workflows with Telnyx Flow. Automate call handling for efficient, reliable voice communication.

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  • Article icon

    Create Custom Call Flows with Telnyx

    Build custom call flows that connect you to the right customers at the right time with Telnyx Voice API. Start building call flows today.

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