Grandstream HT702

Grandstream’s HT series of Analog Telephone Adapters (ATAs) offer a ton of features at an affordable price point. They are trusted and deployed by some of the world's largest service providers. The HT702 is a 2-port FXS, with 10/100 Mbps ethernet and no router. It supports up to 2 SIP accounts.

NOTE: Although this unit is certified, we recommend Grandstream's newer HT812 for new installations. Among other incremental improvements, the HT812 allows you fully utilize its two FXS ports to attach two fax machine to a single T38Fax trunk. Only one fax machine per trunk is supported on the HT702.

  1. Firmware
  2. SIP Registration
  3. Network Settings
  4. Feature Settings
  5. Fax Settings
  6. Fax Machine


Firmware

Update to the latest firmware for your HandyTone before connecting to our service. You can download the current production release from the link above. Once downloaded, you'll navigate to "Advanced Settings" and click the "Upload from Local Directory" button. Select the file you downloaded from Grandstream's website, and then click "Apply" once this has completed your device will reboot. You can then move on to the steps below.




  1. Firmware
  2. SIP Registration
  3. Network Settings
  4. Feature Settings
  5. Fax Settings
  6. Fax Machine


SIP Registration

Select "FXS Port 1" from the primary menu, and and configure the following options for your SIP Registration:

Primary SIP Server: sip.t38fax.com:5080 help
NAT Traversal: Keep-Alive
SIP User ID: SIP Username help
Authenticate Password: SIP Password (will be blanked out when saved) help


  1. Firmware
  2. SIP Registration
  3. Network Settings
  4. Feature Settings
  5. Fax Settings
  6. Fax Machine


Network Settings

Scroll down and configure the following options:

Register Expiration: 5
Local SIP Port: 5080

Allow Incoming Packets from SIP Proxy Only: Yes




  1. Firmware
  2. SIP Registration
  3. Network Settings
  4. Feature Settings
  5. Fax Settings
  6. Fax Machine


Feature Settings

Scroll down and configure the following options:


Disable-Call-Waiting: Yes
Disable-Call-Waiting-Caller-ID: Yes
Disable-Call-Waiting-Tone: Yes




  1. Firmware
  2. SIP Registration
  3. Network Settings
  4. Feature Settings
  5. Fax Settings
  6. Fax Machine


Fax Settings

Finally, configure the following T.38 specific options further down the screen:


Fax Tone Detection Method:  Callee
Jitter Buffer Type: Fixed
Jitter Buffer Length: High
Disable Line Echo Canceller (LEC): Yes
Disable Network Echo Suppressor: Yes


  1. Firmware
  2. SIP Registration
  3. Network Settings
  4. Feature Settings
  5. Fax Settings
  6. 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!