Blog -

Cisco SPA112 and SPA122 ATAs Officially Certified

Posted by Dana Meltzer on Apr 3, 2017 11:00:00 AM

T38Fax is pleased to announce that we have successfully completed interop testing with the Cisco SPA112 2-Port Phone Adapter and the Cisco SPA122 ATA with Router. We're especially excited about this certification since many of the service providers we speak to on a daily basis have already standardized on this platform and have large preexisting deployments of these devices in the field. The device's T.38 support is excellent, but like all T.38 devices they're only as good as the service they're connected to. That's where we come in (see below for links to our knowledge base articles)! 


Cisco itself doesn't need much of an introduction, of course. These ATA’s are part of Cisco’s line of best-in-class small business voice gateways and ATAs, designed to support office or residential communication needs. The undrlying technology has a strong pedigree in the SIP industry, having started out in the early days as Sipura Technology, which was wisely acquired by Cisco and branded as Linksys, then eventually promoted to the official Cisco brand. They are compatible with all industry voice and data standards and common telephone features such as caller ID, call waiting, and voice mail. Fortunately, the Cisco adapters also have a very mature T.38 stack, an essential feature to ensure reliable faxing over SIP trunks.


Most VoIP service providers struggle to provide a stable, reliable solution for fax. Our Power-T.38 SIP trunks, combined with Cisco's ATAs are a powerful solution to this problem, and in our experience result in happy

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Topics: Blog, Interoperability

Service Provider T.38 Offload - We Want Your FoIP!

Posted by Dana Meltzer on Mar 29, 2017 10:01:20 AM

If you've found this article there's a good chance you're a hosted VoIP or SIP trunk vendor whose customers are trying to send faxes, unsuccessfully, over your network. Perhaps your support team is demoralized by the constant barrage of cases being opened by customers who found out just a little too late that VoIP and fax don't play nicely together? Do you wish you could offer T.38 FoIP that actually worked, without the technical support burden? Do you have customers that are frustrated by your lack of fax support? Are you afraid those customers will take all of their business to a competitor who not only advertises support for T.38 but who can actually deliver the goods?


What if I said this could be you? And that after one of the easiest configuration changes you've ever experienced, you'd never have to worry about fax again. Sound too good to be true? It's not.

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Topics: Blog

Grandstream GXW400x FXS Series Gateways Officially Certified

Posted by Dana Meltzer on Feb 27, 2017 5:55:40 PM

We are pleased to announce that we have successfully completed interoperability testing with Grandstream GXW4004 and GXW4008 gateways. Grandstream Networks, Inc. has offered SIP Unified Communications solutions since 2002. Their open standard SIP-based products offer broad interoperability throughout the industry and have been recognized for their quality, reliability, and innovation. The Grandstream GXW400x FXS series gateways enable businesses to create seamless office environments, integrate traditional phones and phone systems into a VoIP network, and efficiently manage communication costs. They are designed for interoperability with leading IP-PBXs, Softswitches, and most SIP-based environments.


Grandstream's 4 and 8-port GXW gateways are an affordable yet powerful choice for customers wanting to connect up to eight (8) analog fax machines to our Power-T.38 service. As with most SIP ATAs/gateways, they can connect to us directly but they can also talk to us through any SIP infrastructure that knows how to do T.38 pass-thru (Asterisk, FreePBX, OpenSIPS, Kamailio etc). The GXWs are capable of routing incoming faxes via the called number (in other words, the incoming DID), which is such a useful feature that we've broken it out into a separate knowledge base article


The Grandstream GXW400x FSX series gateways have been thoroughly tested by our interop ninjas and work seamlessly with our Power-T.38 Fax over IP service. We’ve gathered our screen shots and recommended best practices and assembled them into our Grandstream GXW400x FXS series Knowledge Base Articles, which you can find here:


GXW4004 Knowledge Base Article     GXW4008 Knowledge Base Article  


Ready to put us to the test?

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Topics: Blog, Interoperability

FreePBX Officially Certified

Posted by Dana Meltzer on Feb 22, 2017 3:19:35 PM

We are pleased to announce that we have successfully completed interoperability testing with FreePBX, a product of Sangoma Technologies. FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. It was written by a community of developers and contributors who work to make phone system software functional and easy to use. With over 1 million production systems in over 200 countries, FreePBX is the most widely deployed open source PBX platform in use across the world. 


Fax is a chronic annoyance for FreePBX operators seeking to offer Unified Communications (UC) services to their customers, or for IT administrators looking to base their company's phone system on FreePBX. It’s a shame, too,

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Topics: Blog, Interoperability

NetSapiens Officially Certified

Posted by Dana Meltzer on Feb 6, 2017 3:02:46 PM


We are pleased to announce that we have successfully completed interoperability testing with NetSapiens. NetSapiens provides advanced VoIP solutions to the industry’s leading service providers. NetSapiens’ SnapSolution allows service providers to offer more value to their customers and increase ROI. Its solutions include hosted PBX/Web centrex, unified communications, SIP trunking, security and cost control, user portals, device provisioning, contact center solutions, geo-diversity and high availability, API, and more.


NetSapiens engineers have worked closely with T38Fax to jointly document a configuration that will permit service providers to offload their T.38 Fax over IP traffic to us. This will allow the service provider to claim T.38 support, and it will be completely transparent to their customers. To learn more, see our knowledge base article.


Both T38Fax and NetSapiens will be at ITEXPO in Ft. Lauderdale, February 8-10. If you're in the area, feel free to come and discuss our joint solution. We are even offering free Expo Plus Passes! For more information on NetSapiens and their VoIP solutions, visit their website.


Don't have a T38Fax account?

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Topics: Blog, Interoperability

Fax Voip T38 Fax & Voice Officially Certified

Posted by Dana Meltzer on Feb 2, 2017 4:45:14 PM

We are pleased to announce that we have successfully completed interoperability testing with Fax Voip T38 Fax & Voice software. Fax Voip is a Windows based software that provides a full-featured SIP/H.323 softphone for Voice over IP (VoIP) calling. It also provides full functionality for sending & receiving facsimile transmissions via T.38 & G.711. From the perspective of your fax or voice application, it acts as a Voice/Fax modem, installing Virtual COM Ports and Virtual Fax Voip 14.4k TAPI Voice-Fax modems on your system. You can configure your Fax & Voice program to operate with both the Fax Voip COM ports or virtual modems. From the perspective of your VoIP network, it provides a fully featured SIP/H.323 client with support for faxing over VoIP trunks, both in G.711 and T.38 (and more importantly, with Error Correction Mode - ECM!).

Fax Voip's software passed our rigorous testing requirements and made it to our Certified Device List. We’ve included a simple configuration guide on our website to help you get up and running.


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Topics: Blog, Interoperability

Join Us at ITEXPO East 2017 in Fort Lauderdale

Posted by Dana Meltzer on Jan 26, 2017 3:21:34 PM

Join us at ITEXPO East in Fort Lauderdale, FL from Feburary 8-10, 2017, to meet our Sales and Engineering team and learn more about our ability to provide premium fax-optimized SIP trunks. T38Fax Incorporated will be a Gold Sponsor at this year’s ITEXPO, the industry-leading business technology event. We will also be a Platinum Sponsor of Digium Asterisk World, which will be held within ITEXPO.


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Topics: Blog

ECM - T.38's Dirty Little Secret (And Why It Matters)

Posted by Darren Nickerson on Dec 6, 2016 4:41:00 PM


I'm going to let you in on a secret ... most of the T.38 Fax Over IP (FoIP) service you can buy today is fundamentally broken. As crazy as it sounds, it’s missing the one feature that makes sure the other side receives an exact copy of your image — a feature known as Error Correction Mode (ECM). Each day, millions of fax pages are sent via T.38 circuits that don’t have ECM enabled, and everyone just kind of hopes the fax pages make it to the other side intact. Sounds crazy? We agree!!


What is ECM and why is it important?

Fax is a page-by-page transmission method, usually done over standard telephone lines. The image data from each page is converted into an audio representation of the page, the audio is sent to the other side, and when both parties are ready, they move on to the next page. Now, the clever people who invented the fax protocol realized that phone lines are imperfect, and that every once in awhile there will be a pop, crackle, hum or hiss that distorts that audio signal, leading to loss of fax page image data. That's where ECM comes in - at the end of each page the sender and the receiver compare notes, check for any missing or distorted page image data, and then selectively re-transmit only that data. Again they compare notes, and if there's still missing data they repeat the process, only moving to the next page when the current page is 100% correct.

When ECM is not available, however, the end-of-page procedure is quite different, and error checking and error correction ability is limited. 

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The Stubborn Persistence of Fax

Posted by Darren Nickerson on Aug 15, 2016 2:30:00 PM

I used to feel defensive when people asked me what I did for a living. I suppose it should have come as no surprise that people would do a double take when I answered. After all, I've built a business around a technology that is now considered obsolete by most, and was thought to be in decline even in 2002 when I began.


Hello, my name is Darren, and I am a Fax Entrepreneur.

No, you didn't hear me wrong, I'm a card-carrying member of the facsimile fan club. I have been since 1992 when, while a PhD student at the University of Oxford, I assumed the persona of 'Arlington Hewes' of The Phone Company (TPC.INT) and began to learn about HylaFAX (then FlexFax) ... industrial software for sending massive amounts of faxes. I'm sure many of you can look back on pivotal times in your lives ... a time when many doors are open and choices have to be made, decisions that lead to everything that follows. This was one such time.

So why would anyone in their right mind base a business on fax, you might ask? And if they had made such a mistake, how could they possibly still be doing it?

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Topics: Blog

Obihai OBi2xx Series Officially Certified

Posted by John A. Reed on Jan 12, 2016 10:30:00 AM


The OBi2xx Series Universal VoIP Adapters are targeted at Internet phone service providers world-wide. Their innovation and sophistication in the areas of speech technology, voice traffic prioritization, call management and ease of set-up are catalysts that ignite excitement among consumer and small business users who want the best product for their VoIP communication needs. In addition to its impressive list of voice features, the OBi2xx series also supports T.38, an essential feature to ensure reliable faxing over SIP trunks.

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Topics: Blog, Interoperability