Grandstream: HandyTone 502 (HT502) ATA

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Grandstream HT502

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 HT502 is a dual-port FXS, with 10/100 Mbps ethernet and no router. It supports 2 SIP accounts.

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EOL NOTICE: 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 HT502.



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.


SIP Registration

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

  • Primary SIP Server:
  • NAT Traversal: Keep-Alive
  • SIP User ID: SIP Username
  • Authenticate Password: SIP Password (will be blanked out when saved) (?)


Network Settings

Scroll down and configure the following options:

  • Register Expiration: 5
  • Local SIP Port: 5080 - If you have more than one device at a site, each device at a site should have a unique port = 5080.

  • Allow Incoming Packets from SIP Proxy Only: Yes


Feature Settings

Scroll down and configure the following options:

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


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


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.

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