T38Fax Blog

T38Fax is pleased to join Obihai’s list of compatible service providers. Obihai Technology is a leading manufacturer in the Voice over IP endpoint industry and maker of the best-selling OBi universal voice adapters and IP phones. They developed OBiTALK, a web portal and OBi configuration utility which helps OBi users configure devices and access applications.

Within the OBiTALK portal, Obihai offers a list of compatible service providers, which allows users to easily configure an OBi phone adaptor or IP phone with their specific provider. Using the OBiTALK portal, OBi device owners can select their service provider from this list and enter their credentials. Once a selection is made, the device is automatically configured to work with the service provider, and calls can be made and received within minutes. 

Service provider partners can also sign in to the OBiTALK ITSP Device Management Portal (DMP). This tool was designed for service providers, system integrators, and value-added resellers (VAR) to manage their OBi device deployments. It allows them to remotely and securely access and configure OBi devices from anywhere. When a service provider signs in to the OBiTALK portal, they can set up SIP registration and configure more advanced VoIP functions. This will eliminate the need to configure and re-package each device before sending it to the end user.

T38Fax is proud to be the only FoIP-specific service provider on the OBiTALK compatible service provider list. Our SIP trunks were designed by fax industry experts to solely offer T.38 Fax over IP call origination and termination. We have tested our integration in the OBiTALK portal and found that it offers an easy and straightforward way to 

We are pleased to announce that we have successfully completed interoperability testing with Media5’s Mediatrix 4100 series adaptors and gateways. Media5 is a global supplier of multimedia communication solutions, offering a complete set of SIP-based products and technologies. They deliver IP Communications solutions to customers in over 75 countries throughout the world. Their family of products includes highly-capable customer premise equipment, such as IP gateways, session border controllers, virtual machine platforms, the suite of mobile solutions for media and collaboration tools, and the M5T family of secure SIP-based developer solutions.

Media5 offers a family of ATAs/gateways that allows customers to connect to VoIP networks. The Mediatrix 4100 series VoIP adaptors, with up to 24 FXS ports, interconnect analog telephones, faxes, and modems into SIP based systems. These adaptors support T.38, and they offer clear channel fax and modem pass-through capabilities. So they can connect to us directly, or they can talk to us through any SIP infrastructure that knows how to do T.38 pass-thru (Asterisk, FreePBX, OpenSIPS, Kamailio, etc.).

The Mediatrix 4100 series ATAs have been thoroughly tested by our interop ninjas and work seamlessly with our 

If you're reading this blog, then you rely on FoIP in some way, and it's likely causing you headaches. Maybe you're a single ATA user trying to fax with your current carrier, but not having much luck. Perhaps you have a fax server that won't work consistently now that you've upgraded your phone network to VoIP. Or you're a service provider that can't seem to provide reliable FoIP to your customers and fax support is causing you nightmares.

If you fit into any of these categories, then your business depends on FoIP, but you can't get it to work reliably. As you upgrade your communications infrastructure to SIP, fax support can get left behind. Finding a carrier that guarantees (and supports!!) T.38 on your service is almost impossible. If you’re a carrier or service provider, you know that successful T.38 requires significant investment in equipment and expertise and fax troubleshooting takes skill from seasoned fax experts.

Luckily, we can help! T38Fax provides reliable faxing and premium support over our SIP trunks, which were specifically designed for T.38. Whether you’re a single fax user, a business with a fax server or IP-PBX, or a hosted VoIP or SIP trunk vendor, our Power-T.38 service can work for you. Find your use-case scenario below and see how.

Obihai Technology is a leading manufacturer in the Voice over IP industry and maker of the best-selling OBi universal voice adapters and IP phones. Their analog telephone adapters (ATAs) and gateways can bridge mobile, fixed line, and Internet telephone services. They also support T.38, an essential feature to ensure reliable faxing over SIP trunks.

The OBi202, OBi302, OBi504vs, and OBi508vs are each equipped with multiple ports and are capable of connecting to more than one DID. If you are using one of these devices, you can take advantage of multi-DID routing, which can save you money and decrease the complexity of your configuration. You can consolidate a group of DIDs under a single SIP registration. This will give you the flexibility

We are pleased to announce that we have successfully completed interoperability testing with Asterisk. Asterisk is a free and open source framework for building communications applications, like business phone systems, call distributors, VoIP gateways, and conference bridges. As open source software, it has been enhanced and tested by a global community of thousands. It is sponsored by Digium, and it is used by almost the entire Fortune 1000 list of customers.

Some of our largest service providers have built their businesses on Asterisk and related open source telephony tools. But the challenge to offering dependable faxing has been finding a SIP trunk vendor who offers reliable T.38. Asterisk is known to work very well with our Power-T.38 products. Simply activate service with us, connect to our SIP trunk, and marvel at how well the faxing works.

Our interop ninjas have been hard at work interop testing Asterisk. Their software has passed our rigorous testing requirements and made it to our Approved List. We've gathered our screen shots and recommended best practices and assembled them into our Asterisk knowledge base article, which you can find here:

It really is just that easy. Simply use Power-T.38 as your underlying carrier for fax calls, and we'll take care of the T.38 for you. Just imagine getting rid of those headaches!

Ready to put this to the test?

T38Fax is pleased to announce the launch of its new customer self-care portal. The portal has been completely redesigned as part of our ongoing commitment to enhance our customers' experience and provide outstanding support. We wanted the portal to be more intuitive, sleek, and user-friendly, and we also needed a modern foundation upon which to begin adding new features such as DID ordering, LNP porting and self-service trunk creation. Look for these new features to begin appearing in the coming months!

The new portal launch follows the release of a preview that was sent to customers for feedback. We incorporated many customer suggestions and in the end we think you will agree that the new self-service website offers our customers a far superior online environment, with enhanced features and functionality.

The new self-care portal will offer our customers:

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

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.

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:

Ready to put us to the test?

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,