Retarus Enterprise Fax APIs
For developers who want more than just an interface

Sending and receiving faxes with your application just got super smart.

Whether mobile apps or web applications—Retarus enterprise fax APIs help you find the right interface for your development environment. And best of all, they offer all the key things you need to successfully use fax services: a powerful infrastructure, international availability, and numerous customization options to fit your business operations.

Developer friendly and intuitive

Send faxes from your web or mobile application now. Simple and reliable.
Via REST API, SOAP API or alternatively via FTP or SMTP. It’s quite easy. A few lines of code, and you’re ready to go:

Reports can be sent via email or through an http web service. For additional sending options you can refer to the following WSDL:
https://faxws.retarus.com/Faxolution/v3.0?wsdl

To send a fax using FTP you just need to load on the Retarus FTP server the fax document (e.g. minimal.pdf) and an XML file in the format. The XML file supports most of the options available in other APIs for personalizing each sending. Reports can be retrieved through the same FTP interface.

Through Retarus Email-to-Fax it is possible to send faxes manually through any email client, or in batch by connecting your application through SMTP to the Retarus infrastructure.

Alternatively, a distribution list can be defined as a text file and the message will be sent to all recipients in the list. In this case the destination email address is:

A report will be returned to the sending email address. Further options can be specified by inserting tags in the subject line, for example:

[PRIO:URGENT]: requires an express transmission
[ATTONLY:ON]: only the attachments, not the body of the email, will be sent as fax
[RES:HIGH]: The fax will be sent in high resolution.

Call fax transmission with “all options”:

Call fax receipt:

Discover the benefits of Retarus enterprise fax APIs.

Excellent transmission rate

Reduce your fax transmission failure rate by up to 10% and reduce the administrative costs involved in manually processing your faxes. Retarus' NeverBusy Technology ensures that multiple faxes are never sent to the same recipient simultaneously. Thanks to this technology, even high volumes of incoming faxes are delivered immediately—no busy lines or capacity bottlenecks.

Intelligent routing

Achieve up to 30% more throughput. Active Carrier Management in the Retarus Global Delivery Network automatically uses the lines and carriers whose line quality and availability best match your fax job.

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Scalable and flexible

Eliminate over- and under-utilization of capacity. Regardless of whether you send 1,000 faxes today and one million tomorrow—the Retarus Global Delivery Network provides you with the exact bandwidth you need at any given point in time.

Highly available and global

Rely on reliable transmission worldwide. The Retarus Global Delivery Network offers high availability and high capacity, with its own data centers in Europe, Asia, and the USA, providing maximum availability and delivery reliability. 24/7.

OCR and barcode recognition

Seamlessly integrate faxes in your workflows. Read out information or barcodes from incoming documents with the Retarus OCR and barcode recognition feature and then use customized smart routing options to presort, forward, store, or process the documents automatically according to your rules.

Perfect integration

Whether you use SAP or ERP, a CRM or legacy system, Office 365 or GSuite. Thanks to open standards, Retarus Fax Services can be connected to almost any business or cloud application. For example, with RESTful-API web service or via standard interfaces and protocols such as SMTP, SFTP and HTTPS.

Even more benefits for you …

Monitoring and analysis

Check the status of your fax communications at any time using dashboards and detailed reports in the web-based Retarus Enterprise Administration Services Portal. In real time or in user-defined periods. For both outgoing and incoming faxes.

Completely transparent costs

Reduce your investment and process costs. Retarus lets you massively reduce or completely eliminate costs for telephone and fax infrastructures, fax servers, software, updates, administration, and maintenance. Retarus billing models (flat rate or pay-per-use) use fixed batch and page pricing, regardless of the duration of transmission.

Security and compliance

Rely on maximum security. The Retarus Global Delivery Network, with its global data centers, fulfills the most stringent country and industry-specific requirements for data protection and data security. For example, the German Federal Data Protection Act (BDSG), GDPR, PCI DSS or HIPAA.

PGP and X.509 encryption

Ensure highly secure fax communications. Connection to the Retarus Global Delivery Network is exclusively via encrypted connections (SSL, TLS, VPN). Retarus will also sign and encrypt incoming fax documents for you upon request—depending on the file type per AES 256-bit, PGP, or X.509.

Long-term archiving

Ensure full compliance with industry-specific or statutory regulations. Retarus' long-term archiving helps your fax communications comply with the most stringent data security and integrity requirements.

Enterprise-level SLAs

Choose a service level agreement that meets your needs in terms of quality and response time. Retarus fax APIs are suitable for startups, mid-sized companies, and international enterprises.

Telephone number service

Receive faxes anywhere in the world with local numbers. Retarus provides service and call numbers on all continents that can be managed and assigned easily in the EAS Portal. It is also possible to port existing incoming fax numbers at any time.

Service and support

Experience first-class support. The Retarus Team for Enterprise Fax APIs is here to answer your questions and tailor a solution to meet your needs.

Count on quality.

E-Commerce

Facilitate and optimize order and delivery processes.
View use case

Health Care

Transmit confidential lab data quickly and reliably.
View use case

Banking

Map OTC trading efficiently and according to regulations.
View use case

Expect more.

The Retarus Global Delivery Network is a unique global infrastructure for reliable information logistics via fax, email, text message, and EDI. Since 1992, Retarus has stood for technically advanced fax communications for businesses. Incorporate our expertise in fax transmission in your software today. Easy. Fast. And reliable.

Retarus Enterprise Fax-APIs:
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