Fax API

Send, receive and manage fax via API over a private global IP network for unmatched flexibility, security and reliability.

Try for free

Questions? Ask our experts.

Voice AI Agents: Post-AI4 Insights and The Future of Conversational AI

The Voice AI landscape is evolving rapidly — and enterprises are looking for solutions that deliver real-time, lifelike conversations at scale. In this 45-minute live session, we’ll share what we learned at AI4, show you how Telnyx Voice AI Agents work, and host an open thought leadership discussion on what’s coming next for the industry.

You’ll learn:

Key takeaways from AI4: Trends in compliance, scalability, and emerging capabilities in Voice AI
How Telnyx Voice AI Agents work: From infrastructure advantages to integration flexibility
Live demo: Building an AI Agent in minutes using our MCP server or new Claude front-end
The future of Voice AI Agents: Expert perspectives on multi-agent systems, latency, and innovation strategies

We’ll wrap with a live Q&A so you can get answers directly from our team.

Can’t make it live? Register anyway, and we’ll send you the recording after the event.

FAQ

Yes, we do.

ABOUT

More ways to fax

Fax still holds a place of importance in a rapidly changing world, especially in compliant spaces like healthcare, finance and legal. Our Fax API and global SIP trunking infrastructure enable organizations to work with fax-centric systems—without the need for traditional fax machines or infrastructure.

Build Low Latency Agents with Telnyx

FEATURES

Fax features for total control

Send faxes over a private IP network, with powerful APIs for unmatched configurability.

Enhanced security
Safeguard your data with encryption of signaling and media, and transmission over our private network.
Fax to email
Specify an email address to automatically forward inbound faxes, and wave goodbye to your antiquated fax machine.
Quality routing
Access premium outbound routing with direct connections to Tier-1 faxing partners across our network.
Set your resolution
With our Fax API, you can choose between normal, high or very high quality resolution for your faxes.
Protocol choice
Deliver faxes via T.38 or G.711 pass-through and control T.38 re-INVITE initiator for deep configurability.
High reliability
Ensure your faxes are delivered thanks to automatic error correcting and our multi-cloud network architecture.

BENEFITS

Secure your communications

Send and receive secure faxes wherever you are on our global private IP network.

Points of Presence (PoPs) in our global private network

Eliminate errors

Our advanced error correction features ensure your faxes get delivered with confidence.

T.38

Error correction enabled by default

HOW IT WORKS

Talk to an expert

RESOURCES

Start building

Our code is your code.

In-depth API reference
Explore API specifications, webhook payloads and more to build time-saving fax handling applications.
Explore docs
Programmable fax to email
Learn how to send and receive faxes with your email address, powered by the Telnyx Fax API.
Watch webinar
Send a fax via API
Send your first API-enabled fax in less than ten minutes, with step-by-step setup instructions.
Watch video

PRICING

See our Fax API pricing

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

Starting at

$0.007

Per page

See pricing

SOLUTIONS

Your communications powered by our API

CUSTOMER STORIES

Matt Herrera

Founder & CEO, Documo

I wanted a partner that was API-first and actively investing in continuous product improvement, and that’s what we have in Telnyx.

Read customer story

Sign up and start building

Resources, Docs, Support

Fax Api hub

Programmable Fax Get Started | Telnyx
Telnyx's Programmable Fax service makes it easy to send and receive faxes from your computer or mobile device. With our service, you can easily connect to your fax number from anywhere in the world.
Read more
Send a Fax via API | Telnyx
Telnyx offers powerful faxing capabilities through our programmable fax API. In this tutorial, we'll show you how to send a fax using our API. With just a few simple steps, you can have your faxes sent quickly and easily.
Read more
Receive a Fax via API | Telnyx
Telnyx's Programmable Fax API makes it easy to receive faxes from anywhere in the world. With just a few lines of code, you can start receiving faxes in your own applications and workflows.
Read more
Fax APIs | Telnyx
Send and receive faxes in the cloud using the Programmable Fax API.
Read more
Send a fax API | Telnyx
Send a fax. Files have size limits and page count limit validations. If a file is bigger than 50MB or has more than 350 pages it will fail with file_size_limit_exceeded and page_count_limit_exceeded respectively.
Read more
View a list of faxes API | Telnyx
Read more
Creates a Fax Application API | Telnyx
Creates a new Fax Application based on the parameters sent in the request. The application name and webhook URL are required. Once created, you can assign phone numbers to your application using the /phone_numbers endpoint.
Read more
Retrieve a Fax Application API | Telnyx
Return the details of an existing Fax Application inside the 'data' attribute of the response.
Read more
Benefits of Fax APIs—what are they and why do you need them?
The benefits of Fax APIs means fax is as popular as ever. Read on to see how they can help simplify workflows and reduce errors.
Read more
Programmable Fax API Secure Faxing Released
Our new Programmable Fax API lets you send and manage fax programmatically, leveraging our private IP network and T.38 support.
Read more
How to Debug Communications Webhooks - Easy-To-Use Tools
Use our simple tools to debug your Fax, Voice, and Messaging communications by analyzing webhooks. Watch a live demo today!
Read more
HIPAA-Compliance, Fax, and Real-Time Transmission
HIPAA compliant faxes sent over T.38 SIP trunks have encrypted signaling and media, with no data stored on either end.
Read more
Programmable fax isn’t going anywhere
While a common perception may be that fax is an antiquated technology that is seldom used, it couldn’t be farther from the truth.
Read more
Fax vs email: Which is more secure?
Is fax more secure than email? Fax isn’t without its security concerns. But, when compared to email, here’s why it has a leg up in regards to security.
Read more
There’s a reason healthcare providers still use fax
From added security to convenience, there’s reason why hospitals and healthcare providers still use fax machines to transmit important information.
Read more
Programmable fax - switch from Twilio to Telnyx
Learn why Telnyx is the perfect Programmable Fax partner to switch to from Twilio, who is disabling fax.
Read more
Telnyx Programmable Fax API Video
Our video walk-through shows you everything you need to receive an incoming fax as a PDF using the Telnyx Programmable Fax API.
Read more
Telnyx Programmable Fax API Video Guide
Our video walk-through shows you everything you need to send a fax in one API command using the Telnyx Programmable Fax API.
Read more
The best Bandwidth alternative - Telnyx
Looking for a Bandwidth alternative? Compare Telnyx vs. Bandwidth on reliability, pricing, and support. See why Telnyx is the top choice.
Read more
#1 Plivo Alternative - Telnyx vs Plivo
The top Plivo alternative. Find out why businesses are choosing Telnyx as the better Plivo alternative for CPaaS.
Read more
Configuring Programmable Fax Applications | Telnyx Help Center
Learn how to configure your settings in order to send and receive faxes via API.
Read more
Fax API - Error List | Telnyx Help Center
In this article find explanations for both outbound and inbound errors you might experience with Programmable Fax.
Read more
Telnyx Fax Configuration & Errors | Telnyx Help Center
How to setup and configure Telnyx FAX and its applications. Learn to how to avoid FAX errors.
Read more
Fax service with Telnyx (via T.38 or G711) | Telnyx Help Center
Learn more about setting up fax service with Telnyx using either T.38 or g711.
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
Getting Started | Telnyx Help Center
Get Started with a Mission Control Account. Start building on Telnyx today.
Read more
Cloud Storage Use Cases [Cloud storage backup]
Protect your critical data with our cloud storage backup. Find out how Telnyx can keep your information safe and accessible.
Read more
Voice AI for healthcare | Telnyx
Telnyx healthcare AI offers flexible, HIPAA-compliant voice and messaging AI features. Get connected today.
Read more

More ways to fax

Fax API

Voice AI Agents: Post-AI4 Insights and The Future of Conversational AI

FAQ

Do you integrate to OpenAi’s latest Realtime Voice API?

I am creating a multilingual Voice AI Agent. I've integrated ElevenLabs and Transcriber v3 API. Latency is 1500ms. Can I make it faster?

Do you have a guide to setting up Claude to link with your MCP?

Can we see more of what you have to offer?

Does SMS require me to create a brand and complete 10DLC registration?

Is there a pricing guide to explain the cost structure for MCP and conversational AI usage?

Is Start/Stop speaking planned to be added to the AI Assistant Builder?

How does one get dynamic variable from a Webhook?

Where can I choose a Media Anchorsite and GPU EdgePoP?

Are you guys planning to add more transcribers?

Are you planning to add background audio? This is a great feature that hugely improves the performance from our experience.

Where do you have infrastructure set up in the US?

When using Claude MCP, can you provide it with API endpoints and API key and tell when to connect and use each endpoint?

Where can I learn more on the MCP piece?

Are there any options to integrate with Bicom Systems hosted VoIP platform?

Build Low Latency Agents with Telnyx

Enhanced security

Fax to email

Quality routing

Set your resolution

Protocol choice

High reliability

BENEFITS

Secure your communications

Points of Presence (PoPs) in our global private network

Eliminate errors

Error correction enabled by default

Provision phone numbers

Configure fax applications

Send and receive faxes via API

Launch

In-depth API reference

Programmable fax to email

Send a fax via API

See our Fax API pricing

Your communications powered by our API

Sign up and start building

Programmable Fax Get Started | Telnyx

Send a Fax via API | Telnyx

Receive a Fax via API | Telnyx

Fax APIs | Telnyx

Send a fax API | Telnyx

View a list of faxes API | Telnyx

Creates a Fax Application API | Telnyx

Retrieve a Fax Application API | Telnyx

Benefits of Fax APIs—what are they and why do you need them?

Programmable Fax API Secure Faxing Released

How to Debug Communications Webhooks - Easy-To-Use Tools

HIPAA-Compliance, Fax, and Real-Time Transmission

Programmable fax isn’t going anywhere

Fax vs email: Which is more secure?

There’s a reason healthcare providers still use fax

Programmable fax - switch from Twilio to Telnyx

Telnyx Programmable Fax API Video

Telnyx Programmable Fax API Video Guide

The best Bandwidth alternative - Telnyx

#1 Plivo Alternative - Telnyx vs Plivo

Configuring Programmable Fax Applications | Telnyx Help Center

Fax API - Error List | Telnyx Help Center

Telnyx Fax Configuration & Errors | Telnyx Help Center

Fax service with Telnyx (via T.38 or G711) | Telnyx Help Center

Telnyx Tech Specs | Telnyx Help Center

Getting Started | Telnyx Help Center

Cloud Storage Use Cases [Cloud storage backup]

Voice AI for healthcare | Telnyx

Fax API

Voice AI Agents: Post-AI4 Insights and The Future of Conversational AI

FAQ

Do you integrate to OpenAi’s latest Realtime Voice API?

I am creating a multilingual Voice AI Agent. I've integrated ElevenLabs and Transcriber v3 API. Latency is 1500ms. Can I make it faster?

Do you have a guide to setting up Claude to link with your MCP?

Can we see more of what you have to offer?

Does SMS require me to create a brand and complete 10DLC registration?

Is there a pricing guide to explain the cost structure for MCP and conversational AI usage?

Is Start/Stop speaking planned to be added to the AI Assistant Builder?

How does one get dynamic variable from a Webhook?

Where can I choose a Media Anchorsite and GPU EdgePoP?