# Grandstream HT802 adapter

> Connect an analogue phone or fax machine to your PBX with a Grandstream HT802 analogue telephone adapter (ATA).

- URL: https://kb.voipcloud.online/au/phones-and-apps/other-phones/grandstream-ata/
- Section: Phones and apps › Other phones and adapters
- Type: guide
- Applies to: All countries
- Last reviewed: 2026-11-09

The Grandstream HT802 is an analogue telephone adapter (ATA). It lets an ordinary analogue phone, cordless phone or fax machine make and receive calls through your PBX. It has two phone ports, and each port uses its own **SIP device**.

## Before you start

1. Each port you'll use needs its own SIP device, and each SIP device needs a device licence. Add a **SIP device** to a [User](https://kb.voipcloud.online/au/pbx/accept-make-divert/user/) (which needs a user licence) under **Device configuration**, and click **Apply configuration**.
2. Open **Devices** at the top of the **PBX** tab and select the device. Keep its **SIP credentials** open: **Domain**, **Username** and **Password**.
3. Connect the HT802 to your network and power, and plug an analogue phone into **Phone 1** or **Phone 2**.

The **Domain** shows the server address, a colon and the port.

If **Transport protocol** shows **TLS**, [TLS encryption](https://kb.voipcloud.online/au/pbx/settings/general-settings/) is on for your PBX. The port in the **Domain** is then different, and you must set the adapter to use TLS instead of TCP, with SRTP (shown as **Media encryption**).

## 1. Find the adapter's IP address

1. On the analogue phone, press `***` to open the HT802's voice menu.
2. When asked for a menu option, enter `02`. The adapter reads out its IP address.
3. Type that IP address into a web browser on your computer.

Sign in with the default username and password, `admin` and `admin`. If that doesn't work, ask whoever supplied the adapter.

## 2. Enter the SIP details

**Note:** Menus can change between versions. If a label is different, check the vendor's own help.

1. Open the tab that matches the port your phone is plugged into: **FXS PORT1** or **FXS PORT2**.
2. Fill in:

 | HT802 field | What to enter |
 | --- | --- |
 | **Primary SIP Server** | The **Domain**, including the colon and port. |
 | **SIP User ID** | The **Username**. |
 | **Authenticate ID** | The **Username**. |
 | **Authenticate Password** | The **Password**. |
 | **SIP Transport** | **TCP**. |
 | **Register Expiration** | **2** (this field is in minutes; the default is 60). |
 | **Local SIP Port** | A number above 9000 that no other device on your network uses. |

3. Save and apply the settings.

![HT802 FXS PORT1 tab with the Primary SIP Server field blurred](https://kb.voipcloud.online/au/images/phones-and-apps/other-phones/grandstream-fxs-port.webp)

![HT802 Register Expiration set to 2 minutes](https://kb.voipcloud.online/au/images/phones-and-apps/other-phones/grandstream-register-expiration.webp)

## Extra settings for a fax machine

Sending fax over the internet is unreliable, even with these settings, and your provider can't guarantee it will work. To receive faxes, consider [Fax to email](https://kb.voipcloud.online/au/pbx/different/fax-to-email/) instead.

If you connect a fax machine, also set on its port:

- **Disable Call-Waiting**, **Disable Call-Waiting Caller ID** and **Disable Call-Waiting Tone**: **Yes**.
- **Jitter Buffer Type**: **Fixed**, and **Jitter Buffer Length**: **High**.
- **Disable Line Echo Canceller (LEC)** and **Disable Network Echo Suppressor**: **Yes**.

## Check it works

1. In **PBX** › **Devices**, the SIP device shows **Online**.
2. Pick up the analogue phone: you should hear a dial tone. Make a test call and ask someone to call you.

If it doesn't register, see [Softphone errors](https://kb.voipcloud.online/au/phones-and-apps/softphones/softphone-errors/). A device that tries to register with a wrong password is blocked, and the block lifts after 5 minutes.

## Related

- [Cisco ATA 191](https://kb.voipcloud.online/au/phones-and-apps/other-phones/cisco-ata-191/)
- [Devices](https://kb.voipcloud.online/au/pbx/settings/devices/)