Reliably transmit documents with our Programmable Fax API over Private IP

Send and receive fax via API for unmatched flexibility, security and reliability.
__Reliably transmit documents with our Programmable Fax API over Private IP__

More Ways to Fax

  • Programmable Fax API

    Send, receive, and manage faxes without a fax machine. Build with a set of simple HTTP endpoints using our Programmable Fax API.

    Explore the docs

  • Traditional Fax over SIP

    Connect your fax machine to the Telnyx network to transmit and receive faxes via SIP Trunks, with zero per-page charges.

    Get set up

Build on a RESTful API with unmatched developer experience and support.

  • Automate your processes
    Our Fax API can help automate your most tedious processes, saving you time and eliminating errors.
  • Secure your communications
    Send and receive secure fax wherever you are on our global private IP network.
  • Eliminate errors
    Our advanced error correction features ensure your faxes get delivered with confidence.

Fax Features for Total Control

Enhanced Security

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

Private Network

Strengthen your faxing with a purpose-built, private IP network, and certified fax-ready SIP trunks.

24/7 Support

Our in-house fax-experts are available around the clock, for all of our customers, with no minimum spend commitments.

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 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.

Elastic Scalability

Scale on-demand to handle as many inbound and outbound faxes as you need, exactly when you need them.
FEB 02, 2021
“It has been helpful to have Telnyx available for troubleshooting fax errors when it is beyond our scope of knowledge.”
Jonathan A
Lad Technical Support Engineer

Your communications powered by our API

  • Healthcare

    Faxes are used in healthcare to share a patient's protected health information (PHI) between physicians, and when processing claims forms.
  • Professional Services

    Faxed documents are legally binding and highly condifdential, and so they are often used in law firms to transmit sensitive information.
  • Government

    Fax is used by government officials who need documents transmitted securely, confidentially,and reliably.
  • Financial Services

    Many financial institutions still require documents to be faxed, especially when applying for a mortgage or other loan applications.
  • See our Fax API Pricing

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

    Starting at $0.0070/page.

    See Pricing

Real-time Faxing that's HIPAA-Compliance Ready

  • Encrypted Fax Signaling and Media
    Enable encryption on signaling with TLS and on media with SRTP or ZRTP.
  • Secure Private Network
    Eliminate the risks of the public internet with our private IP network.
  • Real-Time Transmission
    SIP Trunks provide reliable, real-time transmission, so no data is stored at any point.
  • Automatic Error Correction
    T.38 error correction guarantees accurate delivery of information, with page-by-page confirmation.

Ready to get started?

Frequently Asked Questions

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. What’s more - our Programmable Fax API allows you to send and manage faxes programmatically.

Fax over IP (FoIP) is a term used to describe sending faxes using a voice-over IP (VoIP) network. FoIP uses a protocol like T.38 or G.711 to encode the file into a format suitable for sending over SIP trunks.

Fax is still a popular choice in applications where there are legal and regulatory considerations, such as transferring documents that require hard-copy signatures, and protected health information (PHI). It’s also popular as a backup communications method in case of internet connectivity issues.

You can send and receive fax programmatically in just a few lines of code using the Telnyx Programmable Fax API. Learn how to get started by checking our developer docs.