How do I build with the Telnyx Voice API?

To get started, [sign up](https://telnyx.com/sign-up) for a Telnyx account. [Create an application](https://developers.telnyx.com/docs/v2/call-control/quickstart), buy a number, assign it to your app, and connect it to an outbound voice profile. Then, use our API or SDKs to build and test your voice logic.

Can I record calls with a Voice API?

Yes. You can use Telnyx [Voice API](https://telnyx.com/resources/voice-api-explained) to record calls using the record_start command. You’ll find code snippets to help you do this in the [developer center](https://developers.telnyx.com/docs/api/v2/call-control/Call-Commands).

Does Telnyx offer text-to-speech capabilities?

Yes. Convert text into natural-sounding speech using the speak_text command. You can learn how to use the speak_text command in our [developer center](https://developers.telnyx.com/docs/api/v2/call-control/Call-Commands#CallControlSpeak). We leverage Amazon Polly to provide a conversational experience, available across 29 languages and accents.

How much does the Telnyx Voice API cost?

Voice API usage starts at $0.002 per minute. Telnyx offers discounts as you scale, and when you're ready to commit to monthly usage, talk to our sales team about custom pricing. For more information on Voice API pricing, visit our [pricing page](https://telnyx.com/pricing/call-control).

Can I use XML code with the Telnyx Voice API?

Yes! Our tool, [TeXML Translator](https://telnyx.com/texml-translator), makes it easy to use your XML based applications with Telnyx Voice API. The [TeXML setup guide](https://developers.telnyx.com/docs/v2/call-control/texml-setup) in our developer center can help you get started.

What use cases does the Telnyx Voice API support?

You can build a range of different applications using the Telnyx Voice API. Common use cases include [call tracking](https://telnyx.com/use-cases/call-tracking), [cloud IVRs](https://telnyx.com/use-cases/cloud-ivr), [contact center automation](https://telnyx.com/use-cases/contact-center) and conference calling, and AI-powered voice agents.

How can I use AI with Telnyx Voice API?

You can stream real-time audio to AI models, transcribe conversations on the fly, and route calls based on caller intent. Developers can use Voice APIs to power voice AI agents, automate support workflows, and connect to custom or open-source LLMs.

Build Voice Experiences with AI-ready

Voice API

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

Talk to an expert Sign up

140+countries supported

25M+API requests daily

10M+ call minutes per day

WHY TELNYX

Why leading companies choose Telynx Voice API

Global reach
Full programmatic control over PSTN voice services in 130+ countries. As a licensed carrier, we deliver secure, compliant, and reliable infrastructure. So you can, scale your voice application as you grow with confidence.
Ultra-low latency
Voice traffic stays on a private backbone with AI and telephony infrastructure co-located for faster response times. With PoPs in 18 regions, round trip time stays under 200 ms so your IVRs and AI voice agents feel instant for every caller.
Cost-effective pricing
Most CPaaS providers buy carrier capacity, add a markup. With Telnyx Voice API, you get usage-based pricing with no hidden fees, no third-party markups, and no upfront investment in infrastructure. Up to 50%+ cost savings when switching from other providers.

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.

Real-time media streaming
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.
Speech-to-text
Convert voice to text in real-time with low-latency, high accuracy engines from Telnyx, Deepgram, Whisper, Turbo Grok STT or AssemblyAI
Text-to-speech
Play dynamic, natural-sounding voices in 100+ languages and accents using synthesized speech.
Conversational AI commands
Add voice agents to any call in minutes by chaining TTS, STT, and LLM logic via simple AI Gather and AI Assistant commands.
Call control
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.
Browser/App Calling
Easily integrate calling into your web and mobile applications with the power of WebRTC. Our Voice SDKs are available for web, iOS, and Android.

“Telnyx has been an excellent partner in our new integration. They've helped us unlock new regions that we were unable to service in the past and added resiliency to our platform”

Dave Bullock

CTO of UJET

VOICE API FOR DEVELOPERS

Build smarter voice applications with flexible APIs

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

Explore Dev Docs

Dial

curl -X POST https://api.telnyx.com/v2/calls \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "connection_id": "1234567890",
    "to": "+13125550123",
    "from": "+13125550456"
  }'

Record

curl -X POST https://api.telnyx.com/v2/calls/{call_control_id}/actions/record_start \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "format": "mp3",
    "channels": "single"
  }'

Suppression start

curl -X POST https://api.telnyx.com/v2/calls/{call_control_id}/actions/suppression_start \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{}'

Gather using AI

curl -X POST https://api.telnyx.com/v2/calls/{call_control_id}/actions/gather_using_ai \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "parameters": {
      "type": "object",
      "properties": {
        "age": { "type": "integer" }
      },
      "required": ["age"]
    },
    "greeting": "Hi! How old are you?"
  }'

Build faster with AI

Telnyx Agent Skills provides pre-built tools for AI coding agent like Claude Code, Cursor, and Windsurf to integrate with the Telnyx API in minutes. Available in Python, JavaScript, Go, Java, and Ruby. Let your AI coding assistant write Telnyx integrations. Build in minutes.

Learn more

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

PRODUCTS

Build with Voice API

Sign up and start building.

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).

Resources, Docs, Support

Voice API hub

Telnyx Voice Product Suites Overview | Telnyx
Telnyx Voice Product Suites Overview
Read more
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.
Read more
Fundamentals | Telnyx
Overview
Read more
Voice API Commands and Resources | Telnyx
The following endpoints can be used with the Voice API applications.
Read more
Webhooks | Telnyx
Overview
Read more
Voice APIs | Telnyx
Our Voice products make it possible for you to programmatically manage calls, manage outbound voice traffic, and send/receive faxes.
Read more
List call control applications API | Telnyx
Return a list of call control applications.
Read more
Retrieve a phone number with voice settings API | Telnyx
Retrieve a phone number with voice settings
Read more
List connections API | Telnyx
Returns a list of your connections irrespective of type.
Read more
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.
Read more
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.
Read more
Call Control : Telnyx Launches New Programmable Voice API
The Telnyx voice API allows customers to connect and control calls programmatically, all over the globe.
Read more
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.
Read more
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.
Read more
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.
Read more
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.
Read more
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.
Read more
[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).
Read more
How AI-powered voice tools elevate customer conversations
Learn how voice AI is changing customer communication, improving efficiency, and reducing costs.
Read more
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.
Read more
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.
Read more
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..
Read more
Voice API Essentials | Telnyx Help Center
In this collection you will find helpful links that explain the mission control portal features and troubleshooting tips.
Read more
General Voice API Help | Telnyx Help Center
Get assistance with Telnyx's Voice API: UK TPS, Google Verified Calls, STIR/SHAKEN.
Read more
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.
Read more
TeXML and Telnyx Voice API compatibility | Telnyx Help Center
Avoid combining TeXML and Call Control commands in the same application
Read more
Telnyx Tech Specs | Telnyx Help Center
Here you will find out key tech specs at Telnyx and what they mean for our service.
Read more
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.
Read more
Streamline Call Control workflows with Telnyx Flow
Create highly customizable Call Control workflows with Telnyx Flow. Automate call handling for efficient, reliable voice communication.
Read more
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.
Read more

Voice API

140+countries supported

25M+API requests daily

10M+ call minutes per day

Global reach

Ultra-low latency

Cost-effective pricing

Powerful Voice API features

Build smarter voice applications with flexible APIs

See our Voice API pricing

Build with Voice API

Voice AI Agents

WebRTC

Text-to-Speech

Speech-to-Text

Sign up and start building.

FAQ

What is a Voice API?

How do I build with the Telnyx Voice API?

Can I record calls with a Voice API?

Does Telnyx offer text-to-speech capabilities?

How much does the Telnyx Voice API cost?

Can I use XML code with the Telnyx Voice API?

What use cases does the Telnyx Voice API support?

How can I use AI with Telnyx Voice API?

Telnyx Voice Product Suites Overview | Telnyx

Telnyx Programmable Voice | Telnyx

Fundamentals | Telnyx

Voice API Commands and Resources | Telnyx

Webhooks | Telnyx

Voice APIs | Telnyx

List call control applications API | Telnyx

Retrieve a phone number with voice settings API | Telnyx

List connections API | Telnyx

Dial API | Telnyx

What is Voice API? Programmable Voice Explained

Call Control : Telnyx Launches New Programmable Voice API

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

Customer spotlight: Using Telnyx Voice API with OpenAI

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

Telnyx vs Twilio: Voice API comparison for 2025

Foundational tools for building future-ready voice solutions

[Video walkthrough] Getting started with Telnyx Voice API

How AI-powered voice tools elevate customer conversations

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

The Better Twilio Alternative - Telnyx

The better Vonage Voice API alternative - Telnyx

Voice API Essentials | Telnyx Help Center

General Voice API Help | Telnyx Help Center

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

TeXML and Telnyx Voice API compatibility | Telnyx Help Center

Telnyx Tech Specs | Telnyx Help Center

API Keys and How to Use Them | Telnyx Help Center

Streamline Call Control workflows with Telnyx Flow

Create Custom Call Flows with Telnyx