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

Questions? Ask our experts.

Doctor receives e-fax
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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.


Fax features for total control

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

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    Enhanced security

    Safeguard your data with encryption of signaling and media, and transmission over our private network.

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    Fax to email

    Specify an email address to automatically forward inbound faxes, and wave goodbye to your antiquated fax machine.

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    Quality routing

    Access premium outbound routing with direct connections to Tier-1 faxing partners across our network.

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    Set your resolution

    With our Fax API, you can choose between normal, high or very high quality resolution for your faxes.

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    Protocol choice

    Deliver faxes via T.38 or G.711 pass-through and control T.38 re-INVITE initiator for deep configurability.

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    High reliability

    Ensure your faxes are delivered thanks to automatic error correcting and our multi-cloud network architecture.


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.


Error correction enabled by default

Fax API in Telnyx portal

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":"234423","from":"+13125790015"}' \
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    In-depth API reference

    Explore API specifications, webhook payloads and more to build time-saving fax handling applications.

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    Programmable fax to email

    Learn how to send and receive faxes with your email address, powered by the Telnyx Fax API.

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    Send a fax via API

    Send your first API-enabled fax in less than ten minutes, with step-by-step setup instructions.

See our Fax API pricing

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

Starting at


Per page

Your communications powered by our API

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

Matt Herrera

Founder & CEO, Documo


Yes—you can send, receive and manage faxes over your SIP trunks with Telnyx. This allows you to reliably send, receive and manage secure documents without the need for an antiquated fax machine. And, what’s more, our Programmable Fax API allows you to send and manage faxes programmatically.