T38Fax Blog

Do you manufacture or represent a product such as a VoIP gateway, ATA, fax server or other such device that supports T.38 Fax Over IP (FoIP)? Do you frequently hear from customers having trouble getting T.38 to work reliably in their environment? If so, do you wish you could recommend a SIP trunk provider who specializes in T.38 and offers carrier-grade T.38 termination and origination to pair with your equipment? Well I have great news for you, ... we do that.

Believe it or not, we sell SIP trunks whose only purpose in life is to offer reliable fax transmission! We use our own T.38 technology, backed by a team of fax industry veterans to deliver a truly carrier-grade level of service that rivals the PSTN. We also have a team of engineers that work hard testing T.38-enabled equipment to make sure it works seamlessly with our Power-T.38 service.

Once a device is interop certified, we post a knowledge base 

article on our support site and publicize it on our 

We are pleased to announce that we have successfully completed interoperability testing with another line of Grandstream's products, its UCM series IP PBXs. Grandstream Networks, Inc. has offered SIP Unified Communications solutions since 2002, and its products have been recognized for their quality, reliability, and innovation. Specifically, the Grandstream IP PBXs allow businesses to unify multiple communication technologies, such as voice, video calling, video conferencing, video surveillance, data tools, mobility options and facility access management onto one common network that can be managed and/or accessed remotely.

Grandstream's UCM series IP PBXs include a suite of devices that can anchor a business's communications network solution and support from 500 to 2000 users. The Grandstream UCM6100 series and UCM6200 series IP PBXs are similar, but the UCM6200 series can support more users (up to 800) and more concurrent calls (up to 100), The Grandstream UCM6510 IP PBX supports E1, T1, and J1 networks and offers scalability by supporting up to 2000 users. These secure and reliable devices deliver unified communications features without any licensing fees, costs-per-feature, or recurring fees.

Like other Grandstream products, the IP PBXs include extensive support for T.38. That means they can connect directly to our fax-optimized SIP trunks using our Power-T.38 service. Or these products can talk to us through

We are pleased to announce that we have successfully completed interoperability testing with Grandstream’s HT800 series ATAs. Grandstream Networks, Inc. has offered SIP Unified Communications solutions since 2002, and its products have been recognized for their quality, reliability, and innovation. The HT series of ATAs delivers powerful VoIP technology and routing capabilities to home and office environments, and allows users to successfully connect their analog devices to a manageable, robust network. Built using Grandstream’s market-leading SIP ATA/gateway technology, with millions of units successfully deployed worldwide, these powerful ATAs feature exceptional voice quality in various applications and environments.

The HT800 series of ATAs includes 4 different models, giving customers the flexibility to choose the right device

Do you remember the good old days, when things were simple? In the early days of fax, you used physical fax boards and servers, connected to real, tangible ISDN PRI T1 lines. Traditional phone lines were circuit-switched, which is a fancy way of saying they were optimized to deliver perfect audio every time, independent of conditions. Faxing was error free. The physical hardware worked well.

Then came progress. And three things happened to disrupt the status quo:

We are pleased to announce that we have successfully completed interoperability testing with AudioCodes’ MediaPack 1xx series of analog media gateways. AudioCodes designs, develops and sells advanced Voice-over-IP (VoIP), converged VoIP and Data networking products and communications applications for Service providers and Enterprises. AudioCodes is a VoIP technology market leader focused on converged VoIP and data communications and its products are deployed globally in Broadband, Mobile, Cable, and Enterprise networks.

AudioCodes’ MediaPack 1xx series gateways are cost-effective, stand-alone VoIP gateways that provide superior voice technology for connecting legacy telephones, fax machines, and PBX systems with IT telephony networks and IP-based PBX systems. These gateways have up to 24 analog ports, provide superior voice technology, and offer a rich set of advanced telephony features. They are also T.38 fax compliant, which makes them a great fit 

Guest author, Natalie DeCario, is the Marketing Manager at VoIP Innovations, a wholesale VoIP provider that specializes in providing Origination, Termination, E911, Hosted Billing, Fraud Detection, and an End User Portal.

Some will argue that the key to an ITSP’s (Internet Telephony Service Provider) success is to add the combination of choice, automation, and control to their business strategy. This is especially important when trying to reduce the time it takes to keep up with the clerical, yet necessary tasks such as billing customers, porting DIDs, and originating and terminating DIDs. While these tasks keep an ITSP afloat, they are also causing owners to slow down their operations and over clutter their agenda with tactical efforts that take away from strategy and bottom line.

Fortunately, VoIP Innovations has created a platform that allows ITSPs to use technology to receive the choice, 

Guest author, Mike Coffee, is the President and CEO of NetGen Communications (NetGen), a spin-off of Commetrex Corporation. NetGen produced the SmartATA® through their partnership with New Rock Technologies.

When is a fax not a fax?

We are pleased to announce that we have successfully completed interoperability testing with NetGen’s Smart ATAs. NetGen Communications, Inc. (NetGen), a spin-off of Commetrex Corporation, is a provider of ATAs with patented Smart FoIP, gateways, IP and wireless/IP PBXs, and IP phones. Their Smart ATAs are equipped with Smart FoIP patented technology that finally makes FoIP calls as reliable as PSTN fax calls. In addition to innovative fax capabilities, the Smart ATAs also provide quality voice performance and a full range of calling features.

NetGen found that serious problems with SIP negotiations for Fax over IP calls exist in the carrier-based networks. Since our SIP trunks were specifically optimized for FoIP, we are the only provider of reliable T.38 FoIP service. This makes us a natural fit with the Smart ATAs and their focus on reliable FoIP performance.

After rigorous testing, our interop ninjas found that the Smart ATA’s excellent T.38 support, combined with our 

We are pleased to announce that we have successfully completed interoperability testing with Lane Communications’ Passport4000 fax system component. Lane Telecommunications is a dedicated provider of integrated messaging solutions within Healthcare, Banking, and Commercial markets. It operates globally, with offices located in the USA, Singapore, and the UK. Lane is recognized as a leader in messaging and fax integration across financial, healthcare, and government bodies. It has a strong track record in implementing systems across 50 countries, providing professional services in all time zones. Passport4000 is at the heart of the Lane Telecommunications service offering and is its core messaging system.

The Passport4000 offers integrated fax and messaging services accessed over the internet. Its fax system component includes Dialogic’s SR140 SIP stack, which supports T.38. But the challenge to offering dependable Fax over IP has been finding a reliable SIP trunk vendor. Dialogic was our first officially certified partner, and remains one of our most important partners to this day. Our SIP trunks were designed by fax industry experts to only offer T.38 Fax over IP call origination and termination. By including Dialogic’s industry-leading SR140 T.38 stack in their software and certifying Passport4000 with our Power-T.38 service, Lane Telecommunications

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