Grandstream HT802 v2 Analog Phone Adapter Setup Guide

Modified on Sat, 17 Oct at 1:05 PM

Applies toTime neededVersion
Grandstream HT802 v2 (firmware 1.0.5.7 or newer)About 15 minutesv1, March 2026

Overview

This article shows you how to connect a Grandstream HandyTone HT802 v2 to your RingOffice phone service, so that a regular analog phone or fax machine can make and receive calls. Setup is done through the device’s web page.

The HT802 v2 is a small analog telephone adapter (ATA). It plugs into your internet router with a network cable and provides two standard phone jacks. Each jack can be connected to its own RingOffice line or extension.

The device is powered through a USB Micro-B port (5 V, 1 A), so most phone chargers will work if the original adapter is lost. It supports caller ID, call waiting, three-way calling, call transfer and fax over IP.

Before you begin

Have these items ready before you start. Your SIP account details are in the welcome email RingOffice sent you. If you cannot find them, contact RingOffice Support before continuing.

  • A Grandstream HT802 v2 with its power adapter and a network cable.
  • Firmware version 1.0.5.7 or newer. You can check the version on the device’s Status page.
  • A working internet connection with a free network port on your router.
  • An analog phone or fax machine plugged into Phone Port 1.
  • Your RingOffice SIP account details (see the table below).
Detail from RingOfficeWhere it goes in the device
SIP server addressPrimary SIP Server and Outbound Proxy
SIP username (extension or account number)SIP User ID and Authenticate ID
SIP passwordAuthenticate Password
Phone number assigned to this lineFor reference only
Keep it private: Never share your SIP password by email or with anyone other than RingOffice Support. Anyone with these details can place calls that are billed to your account.

Step 1: Connect the device and find its IP address

The device gets its address from your router automatically. You can hear that address through the connected phone.

  1. Plug a network cable from the HT802’s Ethernet port into your router.
  2. Plug a phone into Phone Port 1, then connect the power adapter.
  3. Wait about two minutes until the power and network lights stay solid.
  4. Lift the handset and dial *** (star star star). A voice menu will start.
  5. Dial 02. The device will read its IP address aloud, for example 192.168.1.50. Write it down.

Step 2: Log in to the web page

Use a computer connected to the same network as the HT802.

  1. Open a web browser and type the IP address you wrote down, for example http://192.168.1.50.
  2. Enter the username admin.
  3. Enter the password printed on the label on the bottom of the device. If you or your IT provider changed it, use that password instead.

If the device asks you to set a new password, choose a strong one and keep it somewhere safe.

Step 3: Enter your RingOffice account

These settings connect Phone Port 1 to your RingOffice line. Leave any field not listed here at its default value.

3a. General Settings

Go to FXS Port 1 > General Settings and fill in the fields below, then click Save.

SettingValue
Account ActiveYes (checked)
Primary SIP ServerSIP server address from RingOffice
Prefer Primary SIP ServerYes
Outbound ProxySame SIP server address
SIP User IDYour RingOffice SIP username
Authenticate IDSame as SIP User ID
Authenticate PasswordYour RingOffice SIP password
NameOptional label, for example Front Desk
DNS ModeA Record
NAT TraversalKeep-Alive

3b. SIP Settings

Go to FXS Port 1 > SIP Settings, set the following, then click Save.

SettingValueWhy
SIP RegistrationYesKeeps the line signed in to RingOffice
Register Expiration5 minutesRe-registers often so incoming calls are not missed behind a router
Enable SIP OPTIONS Keep AliveYesKeeps the router connection open between calls
Local SIP Port5060Use 5062 for Port 2, and a different port on any second adapter
Check SIP User ID for incoming INVITEYesRejects calls not addressed to this line
Allow incoming SIP messages from SIP proxy onlyYesBlocks unwanted “ghost” calls from the internet

3c. Codec Settings

Go to FXS Port 1 > Codec Settings and set the voice codec order to PCMU (G.711 μ-law) first, then G.722, then PCMA. Click Save and Apply.

Second line: To set up a second line on Phone Port 2, repeat Step 3 under FXS Port 2 using the second set of SIP details from RingOffice.

Step 4: Fax machine settings

Skip this step if the port is used for a regular phone. Fax machines are sensitive to interruptions, so these settings turn off features that can break a fax mid-transmission.

4a. Call Features

Under FXS Port 1 > Call Features:

SettingValue
Enable Local Call FeaturesNo
Enable Call WaitingNo (unchecked)
Enable Call Waiting Caller IDNo (unchecked)
Enable Call Waiting ToneNo (unchecked)

4b. Codec Settings

Under FXS Port 1 > Codec Settings:

SettingValue
Fax ModeT.38, unless RingOffice Support advises Pass-Through
T.38 Max Bit Rate14400 bps
Jitter Buffer TypeFixed
Jitter Buffer LengthHigh

Under FXS Port 1 > Advanced Settings, make sure Enable Line Echo Canceller (LEC) is checked. Click Save and Apply.

Step 5: Test your line

Restart the device so all settings take effect, then confirm the line works in both directions.

  1. In the web page, click Reboot (top right) and wait about two minutes.
  2. Log back in and open the Status page. Next to Port 1, Registration should show Registered.
  3. Lift the phone and listen for a dial tone.
  4. Call your mobile phone. Check that both sides can hear each other clearly.
  5. Call your RingOffice number from your mobile. Check that the phone rings and that caller ID appears.
  6. If a fax is connected, send a one-page test fax to a known working fax number.

Troubleshooting

Most problems come from a typing error in the account details or from the router. Check the matching row below before contacting support.

What you seeLikely causeWhat to try
No dial tonePort not registered, or phone cord in the wrong jackCheck the Status page shows Registered. Confirm the phone is in Phone Port 1.
Status shows Not RegisteredWrong server, username or passwordRe-enter the details from Step 3 exactly as RingOffice provided them. Passwords are case-sensitive.
Outgoing calls work, but incoming calls do not ringRouter closing the connectionConfirm NAT Traversal is Keep-Alive and Register Expiration is 5 minutes.
One-way audio or no audioRouter SIP ALG interfering with callsTurn off SIP ALG in your router settings, then restart the router and the HT802.
Choppy or robotic voiceInternet connection busy or unstableTest while no large downloads or video streams are running. Use a wired connection to the router.
Fax fails or stops partwayFax settings not appliedRepeat Step 4. Ask RingOffice Support whether T.38 or Pass-Through suits your line.
Forgot the device passwordPassword changed and lostHold the pinhole reset button on the back for 10 seconds to restore factory settings, then start again from Step 1.
Note: A factory reset erases every setting on the device, including your RingOffice account details.

Getting help

If your line still does not work after these steps, submit a ticket to RingOffice Support and include:

  • Your company name and the phone number of the affected line.
  • The device model (HT802 v2) and its firmware version from the Status page.
  • What happens when you try to call, and the time of a recent failed call.
  • A screenshot of the Status page.

For more detail on the device itself, see Grandstream’s HT802 v2 Quick Installation Guide and Administration Guide. Firmware is available from the Grandstream firmware site.

Was this article helpful?

That’s Great!

Thank you for your feedback

Sorry! We couldn't be helpful

Thank you for your feedback

Let us know how can we improve this article!

Select at least one of the reasons
CAPTCHA verification is required.

Feedback sent

We appreciate your effort and will try to fix the article