Cloud Fax Services Technical Specifications, Features and Functions
Secure and seamless faxing directly from your business application, at your workstation, or from your mobile device—always flexible and tailored to your needs. No need to install a specific infrastructure.
General Cloud Fax Features
Retarus Cloud Fax Services make it possible to send and receive documents worldwide—from receipts to delivery notices, invoices, and customer information. The Retarus Global Delivery Network sends faxes quickly and reliably and confirms delivery immediately with existing systems.
- Send and receive faxes with applications and at your workstation
- Completely replaces existing fax server
- No hardware and software installation needed, no maintenance
- Easy-to-integrate API
s – REST, SOAP, FTP, SMTP - High availability, reliable transmission, transaction security
- Nearly unlimited capacity for sending and receiving
- Redundant connection via multiple telephone carriers
- Active carrier management
- Supports transmission priorities
- Transmission times can be set to the minute
- Up to 100% delivery success thanks to never busy technology
- Real-time monitoring of incoming and outgoing faxes
- Comprehensive reports, statistics, and analyses
- Express implementation upon request
- Continued development – ready for next generation of technology
- Transparent billing based on pay per use
Services for Receiving Faxes (Inbound)
Receive faxes into any application or via web services
HTTP(S)
More info
- Automatic processing and workflow integration possible
- Use of existing fax numbers possible incl. porting
- Backup option for incoming faxes

Fax for applications
Receive faxes with FTP server
FTP
More info

Fax2FTP
Receive faxes into any email client
SMTP
More info
- Automatic synchronization of receiving numbers with email accounts from LDAP or Active Directory
- Ability to set up central service number
- Smart routing depending on sender recognition

Fax to Email
Receive faxes with document capture (OCR/ICR/IDR)
More info
- Conversion and delivery of business data directly to your ERP system
- Use of existing communication processes

Fax2EDI
Receive faxes with any multi-function device
More info
- Transaction security
- Flexible connection via SMTP and FTP
- Optimized format adjustment, reliable conversion of multi-page faxes
- Parallel delivery as paper printout on fax machines and redirect to email client
Cloud Fax Functions Overview – Receiving Faxes
Functions Fax Inbound | HTTPS | FTP | SMTP | Fax2EDI | MFD connector |
---|---|---|---|---|---|
Automatic fax replyYou can set up an automatic reply to incoming faxes, which can be customized to suit your needs. If desired, the previously received fax can be inserted as a thumbnail. It is also possible to send different messages depending on the source number. | |||||
Barcode and OCR recognition | |||||
Digital signatureOur service for digital signatures allows you to document fax receipt in a way that is compliant with security and legal regulations. Retarus eSign ensures that faxes you receive from business partners and customers, such as quotations, orders, invoices, customs forms, certificates, formulas, and lab reports cannot be tampered with by third parties. You receive the fax as a signed PDF document that you can view and save.
|
|||||
PDF comment function | |||||
Receipt archiveIncoming faxes can be archived. The number of days a fax is stored is configurable. | |||||
Backup | |||||
AES 256-bit encryptionIncoming faxes can be encrypted if they exist as PDF files. AES 256-bit encryption is used. This means that the recipient needs Adobe Acrobat Version 9.x or higher. PGP or X.509 encryption is available for Fax2FTP and Fax2Applications. | |||||
PGP or X.509 encryptionIncoming faxes can be encrypted if they exist as PDF files. AES 256-bit encryption is used. This means that the recipient needs Adobe Acrobat Version 9.x or higher. PGP or X.509 encryption is available for Fax2FTP and Fax2Applications. |
Reporting Options | HTTPS | FTP | SMTP | Fax2EDI | MFD connector |
---|---|---|---|---|---|
Number of sender | |||||
Number of recipient | |||||
Receipt time and date | |||||
Number of pages | |||||
Receipt status | |||||
Transmission status | |||||
Address of sender | |||||
Address of recipient(s) | |||||
Fax ID | |||||
Fax identifier | |||||
Cost center | |||||
Archived until | |||||
File type | |||||
Service | |||||
Detailed progression of receipt over time |
Service Options | HTTPS | FTP | SMTP | Fax2EDI | MFD connector |
---|---|---|---|---|---|
DirSyncUsers of desktop fax services can be automatically imported with the Communication Directory Synchronization (DirSync) feature. User lists are continuously synchronized with your internal directory. The following parameters can be configured:
|
|||||
VPN | |||||
Configuration in the EAS Portal |
Formats | HTTPS | FTP | SMTP | Fax2EDI | MFD connector |
---|---|---|---|---|---|
PDF/A-1b | |||||
TIFF | |||||
TIFFG4 | |||||
Single page TIFF |
Barcode type | Barcode only | OCR incl. barcode |
---|---|---|
Aztec | ||
Codabar | ||
Code 39 | ||
Code 93 | ||
Code 128 | ||
Data Matrix | ||
EAN 8 and 13 | ||
IATA 2 of 5 | ||
Industrial 2 of 5 | ||
Interleaved 2 of 5 | ||
ITF | ||
Matrix 2 of 5 | ||
PDF 417 | ||
PostNet | ||
QR Code | ||
RSS | ||
UCC128 | ||
UPC-A | ||
UPC-E |
Output format | Barcode only | OCR incl. barcode |
---|---|---|
HTML | ||
PDF/A | ||
RTF | ||
TXT | ||
XLS | ||
XML |
Services for Sending Faxes (Outbound)
Send a fax from any application
or via API
RESTSOAPSMTPFTP
More info
- Fax directly from business or web applications
- Easy-to-integrate API
s – REST, SOAP, FTP, SMTP - Supports existing legacy applications
- Fax confirmation via receipt report
- Save overlays (letterhead templates)
- Supports transmission priorities and configurable times to the minute
- Monitors all transmission jobs in real time
- No usage peaks during batch sending and with large volumes
- Billing at the system and client level according to cost center
- Monthly itemized bill

Fax for applications and APIS for developers
Send faxes through SAP
BC-SMTPSAP-RFC
More info
- Fax from all SAP systems/modules (SAP ERP, SAP S/4HANA, SAP Business ByDesign, etc.)
- Supports scenarios with a SAP router and load balancing groups
- Supports SAP priorities
- Implemented without modifying the SAP system
- No usage peaks during batch sending and with large volumes
- Billing at the system and client level according to cost center
- Monthly itemized bill
Both sending and receiving faxes with SAP systems is possible using the same interface. Incoming faxes are sent to you as PDF documents with the sender’s number and are available in the SAP Workplace.

Fax for SAP and SAP S/4HANA
Send faxes with Epic
HTTP(S)
More info
The benefits include:
- Integrated via the May 2019 and newer Epic Printing Service (EPS) outbound fax API
- Users send faxes using the familiar Epic UI
- Secure fax processing via HTTPS transfer and data at rest encryption
- Automatic fax status delivery via the standard Epic fax job status update API
- Track your Epic fax jobs within Retarus EAS with the Epic job ID, Epic user, etc.
- Support for EPS fax resolution setting
- Use Epic metadata in your customizable fax cover sheets
- Support Epic cover sheet selection
- Include personalized barcodes in your cover sheets to automate processing
- High availability and business continuity across multiple data centers
- Best delivery rates with Never Busy Technology and active multi-carrier management
- No bottlenecks during batch processing and periodic peak volumes
- Monthly itemized bill
- No fax server required
Faxolution for Epic makes faxing more efficient, reliable, and secure. Retarus can also fulfill your inbound faxing requirements and other outbound faxing needs.
Send a fax from any email client
SMTP
More info
- Fax from any email client and any application
- Support for mixed addressing of faxes and emails
- Receive fax confirmations via email in the sender’s selected language
- Feature control via commands in the subject line
- Usage permissions and user profiles
- Automatic user synchronization with your active directory
- Supports cloud services such as Microsoft 365 and Google Apps for Business
- Option: Microsoft-certified Exchange integration
- Option: HCL Notes and Domino integration (no interference with server tasks, no modifications to the email template)

Email to Fax
Send faxes with any Windows application
More info
- Fax directly from your Windows desktop
- Fax from Microsoft Office
- Fax from any Windows application (e.g., CRM system)
- Supports mail merge functionality in Microsoft Word for personalized faxes
- Immediate fax confirmation and transmission report
- Transmission date and time is selectable
- Customized blacklists

Fax for Windows applications
Download Faxolution for Windows Setup // 10 MB // Version 3.9.004 // August 5, 2020
What’s new:
- Improved service availability. Now it is possible to choose a preferred data center for fax job processing.
- New and separate RTF editor for cover sheets.
- Support of new and more secure encryption protocols for the communication with Retarus.
- Automatic printer driver updates are now possible only with the appropriate user privileges.
Send a fax from any web browser
BROWSER
More info
- Sending fax campaigns
- Centralized admin, hierarchical user rights
- Centralized management of distribution lists, black lists and templates
- Supported file formats: BMP, DOC(X), GIF, JPG, PDF, PNG, PPT(X), TIF, TXT, XLS(X)
- Synchronization with national blacklists, such as the Robinson lists of BITKOM and ECOFAX
- Never busy technology for delivery rates up to 100% and error-free delivery
- Optional configuration of a CSID
- Personalization in the fax header and fax text
- Pixel-precise positioning of personalization fields using Drag’n’Drop
- Response elements can be configured for recipients
- Send faxes to different recipients at the same fax number
- Possible fax resolutions: Low and high
- Supported paper formats: DIN A4, US letter
- 18 fonts, including two barcode fonts
Cloud Fax Functions Overview – Sending Faxes
Functions Fax Outbound | FTP | SOAP | REST | SMTP | BC-SMTP | SAP-RFC |
---|---|---|---|---|---|---|
Alternative number per recipient | ||||||
Personalized cover page | ||||||
Selectable resolution (low or high) | ||||||
Selectable paper size (A4, US letter) | ||||||
Individual CSID can be defined | ||||||
Transmission can be assigned a priority (normal, high) | ||||||
Customizable header | ||||||
Overlay for customized header/footer | ||||||
Customizable cover pages | ||||||
Transmission date and time is selectable | ||||||
Transmission deadlines can be defined | ||||||
Recipient time zone is selectable | ||||||
Distribution lists can be used | ||||||
Cost centers | ||||||
Reference information | ||||||
Fax source (entire page/attachment only) | ||||||
Ability to omit empty pages |
Reporting Options | FTP | SOAP | REST | SMTP | BC-SMTP | SAP-RFC |
---|---|---|---|---|---|---|
API queries | ||||||
Status report via email | ||||||
Status callback via HTTP | ||||||
Status report as file | ||||||
Status report incl. TIFF file | ||||||
Report email format (HTML, SAP) | ||||||
Customizable report templates | ||||||
Ability to add comments to report email | ||||||
Report email languagesStandard report email languages:
|
Report information | FTP | SOAP | REST | SMTP | BC-SMTP | SAP-RFC |
---|---|---|---|---|---|---|
Numbers that received faxes | ||||||
Personalization information | ||||||
Cost centers | ||||||
Reference information | ||||||
Status | ||||||
Status details | ||||||
Start date and time of entire job | ||||||
End date and time of single transmission | ||||||
End date and time of entire job | ||||||
Duration of fax transmission | ||||||
Identifier of receiving fax machine |
Service Options | FTP | SOAP | REST | SMTP | BC-SMTP | SAP-RFC |
---|---|---|---|---|---|---|
DirSyncUsers of desktop fax services can be automatically imported with the Communication Directory Synchronization (DirSync) feature. User lists are continuously synchronized with your internal directory. The following parameters can be configured:
|
||||||
VPN connection | ||||||
Archiving | ||||||
Configuration in the EAS Portal |
Character sets | FTP | SOAP | REST | SMTP | BC-SMTP | SAP-RFC |
---|---|---|---|---|---|---|
ISO 8859-1 | ||||||
US-ASCII | ||||||
UTF-8 | ||||||
UTF-16 | ||||||
UTF-16BE | ||||||
UTF-16LE |
Formats | FTP | SOAP | REST | SMTP | BC-SMTP | SAP-RFC |
---|---|---|---|---|---|---|
BMP | ||||||
CSS | ||||||
CSV | ||||||
DOC | ||||||
DOCX | ||||||
GIF | ||||||
HTML | ||||||
JPEG | ||||||
JPG | ||||||
PCL | ||||||
PNG | ||||||
PPT | ||||||
PPTX | ||||||
PS | ||||||
RTF | ||||||
SNP | ||||||
TIF | ||||||
TIFF | ||||||
TXT | ||||||
WRI | ||||||
XLS | ||||||
XLSX |