FREE TRIAL

Our company was founded on two guiding principles:

  • Sell a high quality product
  • Back that product up with exceptional technical support and customer service

In other words, we don’t just support the product... support IS the product.

Popular Articles


  • Follow the steps below to configure HylaFAX Enterprise with your T38Fax.com credentials: Connect to the Appliance Console -- the menu area you see on screen when you boot the HylaFAX Enterprise Appliance server (not the web interfa...

  • All of the ATAs listed in our interop guides have passed our QA tests, but here are three popular models: Grandstream HT812 Obihai OBi302 Cisco SPA122

  • Forget everything you learned on the Internet! Most online 'experts' recommend the following (wrong) settings: Reduce speed to 9600bps Turn off ECM error correction Some fax machines call it 'basic' mode, ...

  • Here are some links to walk you through the process of setting up with T38Fax, in approximately the order you'll want to read them. Pricing Model Popular ATAs Free Trial Signup - If you're planning on porting in, choose a tem...

  • How Number Forwards Work When setting up a call forward, you will need to specify two numbers: the forwarding number, and the forward destination. The carrier currently in possession of the forwarding number (the forwarding carrier) ne...

  • Overview T38Fax owns 8.34.182.0/24 (AS7324) and 8.20.91.0/24 (AS396431), and all of our services operate out of these address blocks. We use SIP over UDP for call signaling. For outbound calling and registration via SIP, you can eith...

  • Overview T38Fax owns 8.34.182.0/24 (AS7324) and 8.20.91.0/24 (AS396431), and all of our services operate out of these address blocks. We use SIP over UDP for call signaling. For outbound calling and registration via SIP, you can eith...

  • This is a technical discussion of ECM (Error Correction Mode). If you're looking for the "executive summary," check out our blog post on the topic: ECM - T.38's Dirty Little Secret. The issues discussed here are for ...

  • ECM stands for Error Correction Mode. In this mode, fax pages are sent in blocks and for any block that fails the error check the receiver will ask the sender to send it again until all blocks have been received successfully. ECM automa...

  •  Refer to Zetafax's own documentation on SR140 configuration configuration. In place of their SIP config instructions (17-19), use our Dialogic SR140 Guide for specific instructions related to our service. Additionally, on step 20...

T.38 Rescue