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Fax over IP (FoIP) Solutions

Learn how Biscom’s FAXCOM Server can help secure your FoIP faxes

Fax over IP (FoIP) enables sending and receiving faxes via a Voice over IP (VoIP) network – such as those from Cisco, Avaya, Alcatel-Lucent, ShoreTel, Verizon, Level 3 and others. In fact, even if you don’t have a VoIP network in place today, you can still implement FoIP and virtualize your fax servers through use of a media gateway to gain IP fax capabilities.

Fax Over IP (FoIP) Image

Support for:

  • VoIP PBX (Cisco, Avaya, ShoreTel & more)
  • SIP Trunks (Verizon, Level 3, XO & more)
  • Virtual (VMware, Hyper-V, XenServer)
  • Media Gateways (Dialogic, AudioCodes, Sonus & more)
  • T.38 or G.711 audio (either/or or fallback mode)
  • Enhanced disaster preparedness

How it Works

FoIP usually works in an IP network using the T.38 protocol, which is a protocol that describes how to send a fax over a computer data network. As this diagram shows, T.38 requires a T.38-capable VoIP gateway as well as a T.38-capable fax server. If T.38 is not implemented in your network or in your SIP trunk carrier’s service, your FAXCOM fax server can use G.711 audio either solely or as a fallback if a T.38 call attempt is unsuccessful.
Fax Over IP How it Works Graphic
Implementations of a FAXCOM® Server as a T.38-capable fax solution use the Dialogic Brooktrout SR140 fax software, available in densities ranging from 2 to 60 channels and supporting up to 120 ports in a single server. Additional channels can be installed with new software license keys. The G.711 implementation is identical, it merely requires a configuration change.

The Dialogic SR140 FoIP product is compliant with the T.38, G.711, SIP, and H.323 industry standards, and Biscom regularly tests its T.38 FoIP solution with additional PBXs, Gateways, SIP Trunking interfaces, and other devices to confirm additional interoperabilities. To verify interoperability with a specific IP environment, contact Biscom for an analysis of the IP environment and configuration recommendations.

Implementing FoIP

In a traditional fax server implementation the fax server includes fax boards that connect directly to the phone network (PSTN) through a local PBX or to the CO (Central Office). The fax server sends and receives faxes over the phone network to remote fax devices.

In a FoIP implementation, the fax server is “boardless” — running only the fax server software licenses. The IP fax server routes faxes to FoIP-enabled endpoints on the VoIP network, such as VoIP routers or gateways. The VoIP routers or gateways then connect to the phone network to send and receive faxes to remote fax devices. Even though the VoIP network is the endpoint sending faxes over the phone network, the fax communication is still a point-to-point, real-time delivery from the IP fax server.

Implementation of T.38 Fax over IP requires a VoIP implementation with routers and gateways configured for T.38 support. It is generally necessary for customers to configure their VoIP network to support T.38 FoIP – it is not a default feature of the VoIP implementation. Customers will need access to technical resources able to configure their VoIP routers and gateways to assist Biscom with the implementation. To reiterate, fallback to G.711 remains an option.