Migrating to All IP Fax (NGN)
Fax over VoIP with Retarus Fax APIs

Error-free digital communication thanks to Retarus Fax APIs
The Challenge
As companies make the change to voice over IP (VoIP) they are benefiting from completely new opportunities offered by innovative communication. What many of those responsible for transforming their ICT infrastructures are not aware of, however, is that in an All-IP network, the effective bandwidth fluctuates constantly, often leading to insufficient bandwidth during peak times. Frequently, this results in losses of information packets. In the transmission of voice messages, for instance in VoIP telephony, these losses are of little consequence, because a speech packet contains only 20 to 30 milliseconds of spoken data. This corresponds to approximately one syllable. The human brain can easily compensate for these information losses. By contrast, fax transmissions are much more sensitive. Missing packets often bring about connection failure and information loss in the form of missing page sections, causing significant disruption in business-critical communication.
The Background
Many businesses are relying on comprehensive unified communication solutions (UC) in the move to All IP. However, there are problems associated with this strategy. While UC platforms indeed offer numerous features for calling, video conferencing, and collaboration, they often do not include any secure fax functionality. In many cases a range of business software is also closely integrated into the current fax infrastructure, so that documents can be sent or received automatically from business applications. With the migration to digital networks, companies urgently need to take steps to connect these systems.
The Solution
With Retarus Cloud Fax Services, faxes can be received without difficulty, even in digital environments and without the use of conventional TC systems. All IP faxes are no longer sent via the telecommunication provider’s VoIP infrastructure, but rather directly via Retarus’ data centers, which have a redundant connection to multiple carriers and bandwidth which can be scaled to meet demand at all times. This effectively prevents packet losses due to resource bottlenecks, even if the fax volume is high.
Customer Benefits
- Seamless fax communication in IP networks
- User friendly
- Continuity of existing processes
- Easy integration using standard APIs
- No need for own fax servers and infrastructures
Use Case
Retarus Cloud Fax Services can be integrated using all common protocols. Irrespective of the VoIP provider, the services can be employed either on their own or as part of a UC solution. Depending on the configuration, incoming faxes over VoIP are forwarded, for example, as email attachments. The advantage is that all documents are received by the responsible employee already digitized as PDF file and can be processed or archived immediately. Media disruption and manual digitization of fax documents are things of the past. The same is true for secure fax transmission, as files are easily sent from a workstation via the email client and converted into fax format.
With Retarus, faxes can also be sent from applications such as SAP, Microsoft Dynamics, or Microsoft 365. To enable continued use of these applications in the All IP era without making modifications, Retarus provides a direct connection to all services via IP protocols and standard APIs. Companies no longer need to run their own fax infrastructure or fax servers. Retarus Cloud Fax Services can be easily implemented and, in contrast to on-premises systems, can be scaled as required. This guarantees the highest levels of transaction security and availability, even during peak times. A web-based administration platform provides customers with maximum control over their own fax communication, as well as extensive information about all server instances.
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Benefits at a Glance
- Operated in Retarus data centers in compliance with the strictest data protection regulations
- Communication channels can be expanded at all times
- Customized and scalable bandwidth with high availability
- Usage-based fees
- Personal support
More Scenarios
Efficient Processing of Vehicle Financing Thanks to Retarus Cloud Fax Services
Paper-based documents still play an essential role in the processing of vehicle financing. In order to ensure that the customer’s financing can be approved speedily despite a growing flood of documents, it is essential to optimize key business processes by automating them.
Transmitting Lab Results Securely Thanks to Retarus Cloud Fax
Lab results correspondence needs to be quick and confidential. Retarus Cloud Fax offers a solution for faxing doctor reports via a secure channel.
Optimized Delivery Processes with Fax Integration
Retarus Cloud Fax Services for applications allow online vendors to reliably place orders with their partners by fax directly and securely. Retailers can simply continue using their existing fax machines to receive them.