Blog -

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.


Read More

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. 

Read More

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?

Read More

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.

Read More

Topics: Blog, Interoperability

MultiTech FaxFinder IP Officially Certified

Posted by John A. Reed on Dec 15, 2015 12:29:55 PM

We provide a robust, standards-based and feature-rich T.38 Fax over IP (FoIP) solution that ensures a uniform and consistently high level of successful fax completion over fax-optimized SIP trunks. In a nutshell, we’re serious about fax. Certification for interoperability with our Power-T.38 service is something we take just as seriously, demanding the same quality and reliability from our partners who wish to have their systems certified for interoperation with our service.

We are pleased to announce that we have successfully completed interoperability testing with MultiTech’s FaxFinder IP fax servers. The FaxFinder IP fax servers were found to provide the stability and reliability that our customers have come to expect, while also providing a rich feature set.

Read More

Topics: Blog, Interoperability

Be Our Guests at AstriCon 2015 in Orlando (Oct 13-15)

Posted by John A. Reed on Sep 29, 2015 3:52:53 PM


Asterisk is the world’s most widely adopted open source framework for building communications applications. It has been disrupting and redefining the telecommunications sector since its introduction in 1999. We’re very familiar with the power of open source telecommunications software via our work with HylaFAX, and we saw so much potential in Asterisk (and the SIP and IAX-based open telephony movement in general) that we launched our Telephony Depot business unit to cater to that market. It should come as no surprise, then, that our Power-T.38 SIP trunks were engineered with Asterisk in mind, and that Asterisk in its many forms appears prominently on our list of approved/compatible T.38 Fax over IP (FoIP) implementations. Our Asterisk Configuration Guide contains a wealth of information and advice for configuring Asterisk to work with your Power-T.38 fax-optimized SIP trunks, and our support engineers should be able to iron out any problems you do encounter.

Read More

Topics: Blog

Obihai OBi5vs Series Officially Certified

Posted by John A. Reed on Sep 3, 2015 11:32:30 AM


At the core of our Power-T.38 service is a robust, reliable, standards-based and feature-rich T.38 Fax Over IP (FoIP) implementation that ensures a uniform and consistently high level of successful fax completion. We are fax industry veterans, and while other SIP providers might shrug and say “Oh well, it’s fax, what do you expect?”, we hold ourselves to exceptionally high standards when it comes to acceptable error rates. Naturally, we demand the same quality from partners who wish to have their technology certified for interoperation with our service.


We are pleased to announce that we have successfully completed interoperability testing with Obihai’s OBi5vs Series Universal VoIP Adapters. The OBi504 and OBi508 were each subjected to rigorous torture testing in our labs, and performed flawlessly. We found them to provide the stability, service, and reliability that our customers have come to expect.

Read More

Topics: Interoperability, T.38

Why Power-T.38 from

Posted by Darren Nickerson on Feb 20, 2015 11:38:00 AM


Our Power-T.38 product is similar to the SIP trunks you might purchase from another VoIP Service provider, with one significant difference - our SIP trunks are not only guaranteed to offer astoundingly reliable T.38 Fax Over IP call termination and origination, but that's really all they're meant to do. These purpose-built trunks are also competitively priced, making them suitable to everyone from the largest telecommunications carriers to the single home office fax machine connected with an analog telephone adapter (ATA).

We understand that you have many choices in today's crowded telecommunications market, so here are a few reasons you should give Power-T.38 a try:

  1. We do T.38 correctly. Almost nobody else does. We know, we looked!
  2. We support facsimile ECM (Error Correction Mode). You need it, and we insist on it.
  3. The largest SIP carriers don't understand T.38 at all - they're voice people.
  4. T.38 Fax Over IP is an elegant, extremely effective solution to a very real problem.
  5. It's free to try us, we even give you $25 and unlimited support from true fax experts.

We'll discuss each of those points in more detail, below. 

Read More

Topics: Blog

Certified - Dialogic SR140 Host-Based T.38 FoIP Software

Posted by Darren Nickerson on Jan 22, 2015 1:53:00 PM

We are pleased to announce that our Power-T.38 fax-optimized SIP trunks have been certified compatible with Dialogic's Brooktrout SR140 fax software. SR140 is a host-based Fax over IP (FoIP) engine that brings the power of the industry-leading Dialogic Brooktrout fax hardware products (such as the TR114 & TR1034 fax boards) to software-based solutions. Dialogic SR140 is one of the most mature, most widely deployed T.38 implementations in the world. has passed Dialogic's rigorous FoIP Interoperability testing process, and now appears on their  list of recommended SIP Trunks. They have also published a configuration guide that explains the exact configuration they used for testing, which can be downloaded below.
Read More

Topics: Blog, Interoperability

Visit us at ITEXPO in Miami Beach

Posted by Darren Nickerson on Jan 16, 2015 5:51:00 PM

Planning a visit to ITEXPO in beautiful Miami Beach this month? Drop-in to Booth #534 to meet members of the Sales & Engineering team and learn more about how our T.38 Fax Over IP service can eliminate all of those nagging fax performance problems you've been troubleshooting. Don't forget to ask about our special promotional offer!!

Why not be our guest, VIP style!? We, in cooperation with our sister company and fellow booth attendee Telephony Depot, are pleased to offer you complimentary VIP access to the show. Quantities are limited, so claim yours now! 

Read More

Topics: Blog

Subscribe to Email Updates

Recent Posts