OBi200

The Mediatrix 4100 Series features VoIP adaptors that interconnect analog telephones, faxes, and modems into SIP based systems. The Mediatrix 4100 Series allows operators to shorten deployment time and ensure a highly secure environment to enable cloud telephony services into branch offices and SMBs.

Follow the steps below in order to configure the Mediatrix 4100 Series gateways with your T38Fax.com account.

NOTE: Firmware Revision DGW 2.0+ is Required!


  1. SIP Servers
  2. SIP Registrations
  3. SIP Authentication
  4. SIP Interop
  5. Fax Machine


SIP Servers

Configure the following under the "SIP -> Servers" menu:


Registrar Host: sip.t38fax.com
Proxy Host: sip.t38fax.com


Be sure to click the "Apply" button.



  1. SIP Servers
  2. SIP Registrations
  3. SIP Authentication
  4. SIP Interop
  5. Fax Machine


SIP Registration

Under the "SIP -> Registrations" menu, choose the appropriate FXS port and configure the following:


User Name: SIP Usernamehelp
Friendly Name: Configure as you like, not mandatory.
Register: Set to Enable


Be sure to click the "Apply" button.



  1. SIP Servers
  2. SIP Registrations
  3. SIP Authentication
  4. SIP Interop
  5. Fax Machine


SIP Authentication

Under the "SIP -> Authentication" menu, choose the appropriate FXS port as the previous step and click the edit icon, then configure the following:


Criteria: Set to Endpoint
Endpoint: Set to Desired FXS Port (ie: Port 1)
Validate Realm: Disable
User Name: SIP Usernamehelp
Password: SIP Passwordhelp


Be sure to click the "Apply" button.





  1. SIP Servers
  2. SIP Registrations
  3. SIP Authentication
  4. SIP Interop
  5. Fax Machine


SIP Interop

Under the "SIP -> Interop" menu, head to the "SIP Interop" box and configure the following:


Registration Contact Matching: Ignore URI Paramets




Click on the "restart required services" message in order to apply all changes. If the configuration is correct then the Ready green light in the Mediatrix front panel will turn on.



  1. SIP Servers
  2. SIP Registrations
  3. SIP Authentication
  4. SIP Interop
  5. Fax Machine


Fax Machine

Finally, configure your fax machine to work properly with your Power-T.38 SIP Trunk. Review our Recommended Fax Machine Settings for details.


Why 5080? Learn More

Enter your SIP Username here. (This should be a DID assigned to your account that is available for registration. IE: 18043027000)
Still Confused? Learn More!

Enter the SIP Password for the SIP Username you entered above.
Still Confused? Learn More!