Dialogic® Brooktrout® SR140 Fax Software

Brooktrout SR140 CD

Host-based Fax over IP engine that leverages field-proven fax technology to deliver high levels of performance, reliability, and scalability. Suitable for high-speed, high-density fax production environments in both enterprise data centers and hosted service provider networks.

Dialogic® Brooktrout® SR140 Fax Software, a host-based Fax over IP (FoIP) engine, brings the power of the industry-leading Dialogic® Brooktrout® fax hardware products to software-based solutions.

Using Brooktrout SR140 enables Dialogic’s partners to focus on increasing the value of their document management and business process automation solutions while maintaining regulatory compliance with directives such as Sarbanes Oxley, HIPAA, and Basel II. A software-based solution also can make it easier to move toward virtualized or cloud-based architectures, and create highly available and scalable platforms or services.

Two License Options Available

Brooktrout SR140 is scalable from two to hundreds of ports, depending upon the FoIP transport method,  application, and server environment. Channels can be added as needed by purchasing and installing additional software license keys up to the maximum supported. Two license versions are available:

  • SR140 - provides a rich set of FoIP features and functions suitable for high-speed, high-density fax production environments in both enterprise data centers and hosted service provider networks. Disaster recovery licenses are available for creating a backup system, which can be used during an interruption in service. This license is referred to as the "full SR140 license" below.
  • SR140-L - provides a more basic feature set for lower density fax processing environments


Brooktrout SR140 has been validated in SIP, H.323, and MGCP environments and has been tested and, where applicable, certified with many SIP trunks and IP-PBXs and VoIP gateways from leading vendors, including Cisco, Avaya, and Alcatel-Lucent.

Check SIP trunk, IP PBX, T.38 gateway, and other FoIP interoperability.

Time-Tested, Industry-Leading Fax

Dialogic delivers time-tested industry-leading fax technology, offering a broad range of fax and FoIP products, which are supported by software partners around the world. Brooktrout SR140 can deliver highly reliable FoIP by using the T.38 fax protocol to send real-time fax messages over IP networks. Because the T.38 protocol retains the standard T.30 fax data stream, it can be used with legacy T.30-based devices and with newer T.38-based solutions. With over 20 years of experience, the Dialogic® Brooktrout® T.30 implementation can lay claim to being the most thoroughly field-tested offering compared to those of all other fax technology vendors.

FoIP solutions built using Brooktrout SR140 can send and receive IP faxes at up to 33.6 kbps, based on the V.34 fax standard. Not only can Brooktrout SR140 process fax at twice the speed of 14.4 kbps fax boards, but it also supports V.8 fast handshaking and advanced compression, which can cut call setup and session-management time by one-third. A document that can be faxed in one minute with a 14.4 kbps intelligent fax board can be sent in less than 30 seconds with an application using Brooktrout SR140. This can translate into significant savings on long distance toll charges. In addition, SR140 optionally supports the ITU-T T.38 Recommendation for Internet Aware Fax (IAF), which defines a real-time method for sending faxes directly between two FoIP endpoints over an all-IP network. During Dialogic-conducted testing between two locations over a SIP trunk, a 15-page document that took ten (10) minutes to transmit using T.38 V.17 took only six (6) seconds using T.38 IAF.

Dialogic has refined its T.30 implementation to account for numerous T.30 variants, which helps make fax processing reliable and leads to customers saving time and money. The T.38 stack has also undergone significant interoperability testing with other IP vendors, helping to provide flexibility and reliability when SR140 is deployed into IP networks.

Enabling FoIP When T.38 Is Not Supported

G.711 fax pass-through is supported by the full SR140 license version. While more susceptible to possible IP network issues, such as packet loss, jitter and latency, G.711 fax pass-through provides an option for enabling FoIP when T.38 is not supported.

Common Fax API for Both TDM and IP

Brooktrout SR140 supports the Dialogic® Brooktrout® Bfv API, the same API used by all Brooktrout fax products. Developers can choose to write one application to the Bfv API and deploy it on both TDM and IP equipment. This dual-network support also allows developers who wish to sell into both TDM and IP accounts to use either Dialogic® Brooktrout® TR1034 Fax Boards or Brooktrout SR140 as the fax technology in their solutions.



T.38 IP fax protocol implementation encapsulates Dialogic® Brooktrout® T.30 fax data stream

Leverages 20 years of experience with the T.30 stack, which is continually enhanced to maintain interoperability with new fax equipment and to enable a high degree of reliability and efficient fax processing

G.711 fax pass-through

Can support fax on an IP network when a gateway or IP network operator does not support T.38, broadening the range of possible installations

V.34 transmission speeds for both T.38 and G.711

Can process faxes at twice the speed of V.17 fax products, reducing long distance toll costs

T.38 Internet Aware Fax (IAF) over UDP


Supports ITU-T T.38 Recommendation defining a real-time method for sending faxes directly between two FoIP endpoints over an all-IP network, eliminating TDM, G.711, and modem derived speed limitations

Exceptionally low CPU utilization

Provides efficient, high-performance, host-based fax processing, leaving more processing power for other applications

API support for collection of network quality metrics

Useful in determining suitability of underlying fax transport, such as an IP network, for providing fax service

Voice play and record and DTMF detection and generation

Allows fax integration into IVR and call center systems for improved customer satisfaction

Server virtualization support

Enables the deployment of fax server applications on virtual machines with leading server virtualization software, which increases data center efficiency and provides failover for mission-critical fax applications

Technical Specifications

Basic Functions By License Version

Full SR140 Version SR140-L Version
Density 2 to hundreds of channels per system 2 to 8 channels per system
Fax transmission ITU T.38; G.711 pass-through T.38
Fax modems ITU T.30 Group 3 V.34, V.17, V.29, V.27ter, V.21 and V.33 modulation with auto fallback ITU T.30 Group 3 V.17, V.29, V.27ter, V.21 and V.33 modulation with auto fallback

Common Features and Functions

Virtualization Up to 4 virtual machines per physical server, depending on application and server used
Image format MH, MR (ITUT.4), MMR (ITUT.6)
Page format A4, A3, and B4 with scaling
Resolution 100x100, 200x200, 300x300, 400x400, 600x600, 800x400, 400x800, 600x1200, 1200x1200
Error correction mode (ECM)
Line error detection/correction
Font download
Signaling SIP (RFC 3261); H.323 (version 4)
Interoperability Dialogic often adds IP-PBX, T.38 gateway, and SIP trunk interoperability information to the Dialogic website; see http://www.dialogic.com/interoperability/fax for a current list
Operating Systems Windows®; Linux. Details at http://www.dialogic.com/systemreleases
Application Programming Interface Dialogic® Brooktrout® Bfv API
Minimum System Requirements Pentium 4 / 2.66 GHz
512 MB PC2100 DDR SDRAM memory
Ethernet connection


Data Sheet

  • Dialogic® Brooktrout® SR140 Fax Software is a software-only solution that leverages the existing Brooktrout fax protocol to deliver the high levels of performance, reliability, and scalability of field-proven Dialogic® Brooktrout® fax hardware solutions. The Brooktrout SR140 allows organizations to integrate fax servers and fax document management applications with their VoIP network.

Application Notes

Case Study

Technology Brief

  • With its application partners, Dialogic enables enterprises to leverage their existing Cisco equipment to deploy a proven, Cisco-certified Fax over IP (FoIP) solution. 
  • This technology brief discusses the technical issues to consider when moving to a FoIP solution, and in particular discusses Dialogic® Brooktrout® SR140 Fax Software, which is FoIP software based on field-proven Dialogic® Brooktrout® fax technology, and Dialogic® Media Gateways (DMG Gateways), which are important in bridging legacy PSTN/PBX and new IP networks.

  • Dialogic® Brooktrout® Fax Software was used to demonstrate the amazing speed at which a fax can be sent with Internet Aware Fax (IAF) technology when used in combination with a SIP trunk that supports peering. – a fax that typically would have taken up to 10 minutes to transmit using T.38 V.17, instead took only 6 seconds.

White Paper

Use the Purchase page linked below to find partners to purchase Dialogic products. The order codes below are for your reference when making a purchase.


ProductOrder CodeDescription
Dialogic® Brooktrout® SR140 Fax Software licenses use Product Activation Technology. License activation may be completed via the internet, email, or fax, and involves entering the license key provided in the SR140 LAC Shipment (License Activation Code Shipment) email.
Brooktrout SR140 fax licenses are orderable in the channel denominations listed below. Multiple licenses can be installed on the same system to reach the desired channel count, up to the supported maximum.Optional support for T.38 IAF may also be added to existing full SR140 licenses in the same increments as shown below.
License ConfigurationsSR140 VersionSR140-L Version
Without disaster recovery2, 4, 8, 12, 22, 24, 39, 48, or 60 channels2, 4, or 8 channels
With disaster recovery2, 4, 8, 12, 22, 24, 39, 48, or 60 channels2, 4, or 8 channels