Voice API

Make, receive and control calls globally with programmable voice capabilities. Start building today on the Voice API trusted by developers.

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Man using voice api
Customer Logo Ooma
Customer Logo Replicant
Customer Logo Talkdesk
Customer Logo Aircall

Build programmable voice experiences into calls

The Telnyx Voice API makes it simple to make, receive and control voice calls with code. Build intelligent call flows with recording, conferencing, speech recognition, real-time call media access, agent coaching and more—it's all possible with a powerful REST API or intuitive XML scripting. Your calls run on our global private IP network for carrier-grade quality and uptime everywhere on earth.


Powerful voice API features out of the box

Build programmable voice applications like you would build a web app—simple HTTP commands or XML scripting unlocks a toolkit of features including call flow control, recordings, conferencing and more.

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    Conference calling

    Connect people and teams across the globe with feature-rich audio conferencing.

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    Media streaming

    Access the raw audio stream of calls in real-time to integrate advanced AI/ML capabilities.

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    Speak dynamic text in 29 languages and accents, powered by Amazon Polly.

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    Answering machine detection

    Detect voicemail systems with exceptional accuracy using advanced AI techniques.

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    Real-time transcription and diarization on a live call, activated via one API command.

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    Smart IVR

    Build a multi-level interactive voice response (IVR) phone tree to intelligently route your call flows via DTMF or voice commands.


High quality voice calling

With Tier-1 interconnects at major global internet hubs, your calls get through the first time, every time.


Reduction in call failures for a global contact center.

True real time call control

Send call commands and respond to call media events with super low latency, for truly interactive calling experiences that work on live calls, in real time.


Reduction in talk-time latency for a real-time AI voice responder.

Make calls on every platform, everywhere

Get instant local, national and toll-free numbers anywhere on earth, and scale on demand with unlimited capacity.


Countries with phone numbers available for purchase or porting.


Start building

Our code is your code

curl -X POST \
  --header "Content-Type: application/json" \
  --header "Accept: application/json" \
  --header "Authorization: Bearer YOUR_API_KEY" \
  --data '{"connection_id": "uuid", "to": "+18005550199", "from": "+18005550100"}' \
  • Icon Resources Docs

    Get the answers you need with in-depth documentation

    Explore quickstart guides, tutorials and ready-to-use code examples and leverage an in-depth API reference to get the most out of your programmable voice applications.

  • Icon Resources EBook

    Your guide to choosing the right voice API

    Learn all you need to know about voice APIs, why your business needs one and what to look for in potential providers.

  • Icon Resources Article

    What is a voice API?

    Learn everything you need to know about programmable voice—from how it works, to how much it costs, to must-have features and use-cases.

See our Voice API pricing

Customers typically save 30% by switching to Telnyx, with lower list pricing and automatic volume discounts.

Starting at


per minute

All your business needs, in one API

Telnyx media forking gives Replicant low-latency access to audio packets to be able to feed our AI models. In many cases, Telnyx was the fastest provider that was there on the market.
Customer Quote Replicant

Benjamin Gleitzman

CTO, Replicant


A Voice API is a tool that software 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).