Grandstream: HandyTone 813 (HT813) ATA

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Grandstream HT813

Grandstream's HT series of Analog Telephone Adapters (ATAs) offers a ton of features at an affordable price point. They are trusted and deployed by some of the world's largest service providers. The HT813 is a 1-port FXS, 1-port FXO gateway with a two-port gigabit ethernet router. It supports up to 2 SIP accounts.

Minimum supported firmware: v1.0.1.2

Related Links:


First Login

When first configuring your HandyTone, you must connect your computer to its LAN port and access its web interface at If you'd like to open up the WAN port for administrative access, which is completely optional, go to the "Basic Settings" tab and change the following settings:

  • Disable Telnet: No
  • WAN Side Web/SSH Access: Yes
  • Reply to ICMP on WAN port: Yes

Next, 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" 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, such as 5081, 5082, etc..

  • 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:

  • 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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