Voice API
Build and control global calls with real-time media access and AI-ready APIs. Designed for developers who need full programmability and direct access to telephony infrastructure.
Build voice experiences with full programmability
Building advanced voice logic for complex tasks is difficult when APIs don’t expose full control. Telnyx solves this with developer-first Voice APIs that allow you to make, receive, and manage every aspect of your voice calls programmably. Design intelligent call flows, capture real-time media, enable live coaching, and automate routing using a powerful REST API or flexible XML scripting. Every call runs on our global private IP network to ensure low latency and maximum reliability anywhere in the world.
FEATURES
Powerful voice API features
Telnyx Voice API gives developers everything they need to build programmable voice solutions at scale.
Speech-to-text
Convert voice to text in real-time using fast, accurate transcription with speaker separation.
Text-to-speech
Play dynamic, natural-sounding voices in 29 languages and accents using synthesized speech.
Call recording
Capture any part of a call for compliance, training, or playback with full developer control.
Real-time media streaming
Access raw audio streams from live calls to build custom AI, analytics, or voice security workflows.
Conference calling
Connect multiple calls across the globe into a shared audio stream with recording and API-level controls.
Programmable call control
Initiate, bridge, transfer, and end calls with precision using intuitive API commands.
BENEFITS
Say goodbye to fuzzy audio
Calls connect faster and sound clearer with direct Tier-1 interconnects at major global internet hubs and HD voice codecs in the US.
99%
Reduction in call failures with HD voice and global connectivity.
Enhance customer engagement
Send commands and process media events with ultra-low latency for instant, dynamic call handling.
66%
Lower latency for AI voice responders using Telnyx.
Scale globally with ease
Provision local, national, or toll-free numbers in seconds and scale capacity as you grow with no rate limits.
140+
Countries with phone numbers available for purchasing or porting.
RESOURCES
Start building.
Get the docs, tools, and support to build.
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"}' \
https://api.telnyx.com/v2/calls
Developer-first documentation
Explore quickstart guides, tutorials, code samples, and a full API reference to help you launch and scale with confidence.
What is a Voice API?
Get a clear breakdown of how programmable voice works, what it costs, and the features to look for when building voice into your app.
Real-time speech-to-text
Explore how real-time transcription supports natural interactions, improves responsiveness, and helps power multilingual AI conversations.
PRICING
See our Voice API pricing
Customers can save up to 30% by switching to Telnyx with lower per-minute rates, automatic volume discounts, and no hidden fees.
Starting at
$0.002
per minuteSOLUTIONS
All your voice needs, in one API
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.
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).