Voice API Features

Build customized voice experiences into your applications.


Advanced Calling Capabilities

Essential Voice Features
The Telnyx Difference
Advanced Call Control

Use real-time RESTful APIs to make, receive and manage calls with interactive command and control.

Media Streaming

Access the raw audio stream of calls in real-time to integrate advanced AI and machine learning capabilities.


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

Answering Machine Detection

Know if an outbound call reached a person, answering machine, or fax with 97% accuracy.

Agent Coaching

Speak privately on a call to provide feedback and guidance to an agent.

Audio Playback

Play pre-recorded prompts, advertising or custom hold music


Instant Global Numbers, Any Device

Essential Number Features
The Telnyx Difference
Local Phone Numbers

Instantly provision local, national, mobile and toll-free phone numbers in 140+ countries globally via our easy-to-use portal or API.

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SIP Interface Calling

Augment your existing VoIP infrastructure to route calls to the Telnyx voice API , without having to migrate hardware or carrier.

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Toll-Free Phone Numbers

Acquire new toll-free numbers in 120+ countries, or use your existing one.

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Browser or App Calling

Enable calling from any web interface or mobile application.

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Developer Tools for Streamlined Integration

Essential Usability Features
The Telnyx Difference

Access our extensive API reference docs, quickstart guides and application-based tutorials to build whatever you need.

Read the docs or API reference

TeXML Translator

Switch from your XML-based solution in minutes, with minor changes to your TwiML code, or easily build new apps with XML.

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Read the docs


Choose from Python, Ruby, Node, Java, PHP and .NET for a fast, seamless go-to-market.

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Lookup API

Verify format, caller and carrier data for every number for instant customer context.

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Let's Take A Deeper Look

Unlock new insights with Media Streaming

Media Streaming enables your application to deliver calls while simultaneously duplicating call media to multiple recipients. Call media can be duplicated, delivered, analyzed and returned—all in real-time. Use Media Streaming to build next-gen features into your application:

  • Sentiment analysis
  • Conversational AI
  • Fraud detection
  • Call transcriptions
  • Voice biometrics.

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Leverage Answering Machine Detection to tailor your experience

Answering Machine Detection (AMD) can tell you in real time whether a call has been answered by a human or a machine, with industry-leading detection accuracy of over 97%.

  • Know when your outbound call is answered by a machine, so you can avoid connecting an agent unnecessarily.
  • Pinpoint when the voicemail greeting ends, so you can leave a complete message rather than frustrating customers with half-messages left on their voicemail.

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Migrate risk-free with TeXML Translator

TeXML Translator allows you to switch to the Telnyx API in minutes using your existing XML code.

  • If you already have an XML (or TwiML) application, configure your Telnyx portal connection to point at your XML endpoint. When a call comes in, we’ll do the rest.
  • Or, write a new application in minutes using simple TeXML commands—called verbs—which you wrap in an XML file. Telnyx will then execute the commands in your XML file in order.

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A Better Voice Experience is Calling

  • Global scalability

    Our network combines global points of presence and deep interconnects with local carriers for worry-free, compliant global communications.

  • Deep number coverage

    Thanks to our licensed carrier status in 25+ countries worldwide and close partnerships with Tier-1 carriers in over 140 countries worldwide.

  • Real time control

    The Telnyx API allows users to receive commands dynamically throughout the call for granular-level, interactive command and control.

  • Support you can count on

    Our best-in-class 24/7 NOC support is available by phone and email for every single customer with no minimum spend requirements.

Try Telnyx

Transform your business communications with next-gen products.

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