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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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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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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.

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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, UJET expanded into new markets while delivering reliable and rich contact center experiences.

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Use cases

Build smarter apps with programmable voice

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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).