---
product_id: 275914084
title: "Grandstream HT ATA 812"
brand: "grandstream"
price: "VT28929"
currency: VUV
in_stock: true
reviews_count: 5
category: "Grandstream"
url: https://www.desertcart.vu/products/275914084-grandstream-ht-ata-812
store_origin: VU
region: Vanuatu
---

# Gigabit NAT router for blazing fast LAN 2 FXS ports for analog phones AES security protocol for safe calls Grandstream HT ATA 812

**Brand:** grandstream
**Price:** VT28929
**Availability:** ✅ In Stock

## Summary

> ☎️ Stay connected the smart way—old number, new tech, zero compromise!

## Quick Answers

- **What is this?** Grandstream HT ATA 812 by grandstream
- **How much does it cost?** VT28929 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/275914084-grandstream-ht-ata-812)

## Best For

- grandstream enthusiasts

## Why This Product

- Trusted grandstream brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Legacy Meets Future:** Keep your classic landline alive with seamless VoIP integration.
- • **Rock-Solid Security:** AES encryption ensures your calls stay private and protected.
- • **Plug & Play Simplicity:** Compact design with easy setup—once configured, forget it’s even there.
- • **Cost-Savvy Communication:** Slash monthly landline fees without sacrificing call quality or reliability.
- • **Power-Packed Connectivity:** Dual FXS ports plus gigabit Ethernet for ultra-reliable voice and data flow.

## Overview

The Grandstream HT ATA 812 is a professional-grade 2-port analog telephone adapter with integrated Gigabit NAT routing, designed to preserve traditional landline functionality via VoIP. Featuring dual FXS ports, AES security, and 10/100/1000 Mbps Ethernet, it offers seamless integration for home or business users looking to maintain legacy phone numbers while benefiting from modern network speeds and robust call security.

## Description

Powerful 2-port ATA with Gigabit NAT Router. The HT812 is an advanced 2-port analog telephone adapter (ATA) with 2 FXS ports and an integrated Gigabit.

Review: Compatible with Zen's UK "BT digital voice" switchover - Bought as I'm a zen.co.uk customer, and have UniFi throughout the house (I don't use the Fritzbox). With the BT/UK "digital voice" switchover in full-swing, I wanted a means to keep our old land line alive. This worked perfectly. Configuration hasn't been utterly straight-forward, but I've finally found the following settings work (for Zen customers): - Ensure your NAT/firewall is forwarding the required ports through to the Grandstream (5060/UDP from 212.23.7.228, and 20000-30000/UDP from 62.3.88.0/28 and 62.3.88.16/28) - Primary SIP server: voip.zen.co.uk - Secondary SIP server: voip2.zen.co.uk - Prefer Primary SIP server: No - Outbound proxy: Blank/None - Allow DHCP Option 120: No - SIP Transport: UDP - NAT traversal: No - DNS Mode: A Record - DNS SRV: No - Fallback Timer: 60 - Use Request Routing ID in SIP INVITE Header: No - Sip Registration: Yes - Outgoing Call without Registration: Yes - Register Expiration: 5 - Enable SIP OPTIONS/NOTIFY keep alive: No - Local SIP port: 5060 - Local RTP port: 5004 - Random SIP port: No - Random RTP port: No - Enable RTCP: Yes - Hold Target Before Refer: Yes - Refer-To Use Target: No - Remove OBP: No - Support SIP Instance ID: Yes - Validate Incoming SIP Message: No - Use Privacy Header: No - Use P-Preferred-Identity Header: Yes - Use P-Access-Network-Info Header: Yes - Use P-Emergency-Info Header: Yes - Use P-Asserted-Identity Header: No - SIP REGISTER Contact Header Uses: LAN - Caller ID Fetch Order: Auto - DTMF: RFC2833 - SLIC: UK - Caller ID Scheme: SIN 227 - Dial Plan: (You may want to customise) ... { 999 | 10[015] | 11[129] | 11[68]xx | 1[45]7[1-2] | 8001111 | 845464x | [1235789]xxxxxxxxx | 23456789]xxxxx | 1410[1235789]xxxxxxxxx | x+ }
Review: Great way to save your landline number - Although landlines are largely replaced with cell phones, you may have a reason to hold onto an old number. This was the case for us having owned a line for many years, but the rising costs had become unreasonable ($45/mo), just to keep a line that rarely gets used. I began looking at alternatives, and two stood out: give up the line entirely, or port the number to a VoIP provider. Some of you might say to port the number to a cell plan, but even $15 per month on a prepaid plan would feel wasteful. So, before ditching the line, I looked into VoIP, which honestly is a bit confusing. Some providers sell hardware/devices and bundle the service with that, others use stand-alone devices. I looked into the bundled service + device route first but those seem to have really bad customer service or quality of service reviews. Their pricing can also be quite deceptive on what you would actually pay. After that I saw a few recommendations for a VoIP provider based out of Canada as having great pricing and works with a variety of stand-alone devices like this Grandstream. I went this route and am very pleased with the result. For starters, my family can’t even tell anything changed. After a few days my landline number ported successfully to the new provider. Incoming and outgoing calls work just like they did before, and the sound quality seems the same. The Grandstream device itself works great. I am not using this as a router, I just plug it into an open LAN port on my network, and then run a line to my existing cordless home phone. It is small, doesn’t get very warm, and isn’t obnoxious with its indicator lights. Programming the device to connect with the VoIP provider did require following a guide, and the UI isn’t the best looking but gets the job done. The good thing is once you get it connected and working, you’ll probably never need to touch it again. Opportunities for improvement - Updating to the latest firmware is confusing – why is the wrong update URL set at the factory? I was able to update after finding instructions online. Also, the WebUI feels like a throwback to setting up an old router from the 90s.

## Features

- Easy to maintain
- Designed to perfection
- Comes in a good packaging

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M2ZJQAF |
| Antenna Location | Business, Home |
| Antenna Type | Fixed |
| Best Sellers Rank | #43,961 in Computers ( See Top 100 in Computers ) #87 in Network Cards |
| Brand | Grandstream |
| Built-In Media | 1 |
| Color | Black |
| Compatible Devices | Personal Computer |
| Compatible devices | Personal Computer |
| Connectivity Protocol | SIP |
| Connectivity Technology | Ethernet |
| Control Method | Remote |
| Customer Reviews | 4.3 out of 5 stars 479 Reviews |
| Data Transfer Rate | 100 Megabits Per Second |
| Frequency Band Class | Dual-Band |
| Frequency band class | Dual-Band |
| Global Trade Identification Number | 06947273702153 |
| Has Internet Connectivity | Yes |
| Is Electric | No |
| Is Modem Compatible | Yes |
| Item Dimensions L x W x H | 33L x 22.9W x 7.1H centimeters |
| Item Weight | 0.29 Kilograms |
| LAN Port Bandwidth | 10/100/1000 megabits per second |
| Manufacturer | Grandstream |
| Maximum Upstream Data Transfer Rate | 100 Megabits Per Second |
| Mfr Part Number | HT-812 |
| Model Name | HT-812 |
| Model Number | HT-812 |
| Model name | HT-812 |
| Number of Ports | 2 |
| Operating System | RouterOS |
| Other Special Features of the Product | WPS |
| Recommended uses for product | Business, Home |
| Router Network Type | wired |
| Security Protocol | AES |
| Special features | WPS |
| UPC | 753459331842 |
| Unit Count | 1 Count |
| Voltage | 28 Volts |
| Warranty Description | 1 |

## Product Details

- **Antenna Type:** Fixed
- **Brand:** Grandstream
- **Color:** black
- **Compatible Devices:** Personal Computer
- **Connectivity Technology:** Ethernet
- **Frequency Band Class:** Single-Band
- **Included Components:** 1
- **Model Name:** HT812
- **Recommended Uses For Product:** Security
- **Special Feature:** WPS

## Images

![Grandstream HT ATA 812 - Image 1](https://m.media-amazon.com/images/I/51ZE9wX64GS.jpg)

## Questions & Answers

**Q: Does it work with google voice? if it does then how hard is it to setup with google voice as compared to obi devices?**
A: Yes googlevoice can be added 
Get an account at https://www2.pbxes.com/  add googlevoice trunks to pbxes.com and setup extensions on HT812
more details here http://nerdvittles.com/?p=26971

**Q: Will this convert digital voip signal to analog on a stand alone caller id unit? (connected to a point of sale system).**
A: Yes.  You will connect the device to your internal or external SIP service, then it will ring and pass through the caller ID between the rings, just like a regular phone line.
Also, the caller ID is enabled by default.

**Q: What firmware and hardware rev will I get when I purchase it today?**
A: Dear Customer, 
Hardware Version:	  V4.0A    Part Number -- 9610005040A
Software Version:	Program -- 1.0.35.4    Bootloader -- 1.0.35.1    Core -- 1.0.35.3    Base -- 1.0.35.4  CPE -- 1.0.4.5
Best Regards, Flytec Computers.

**Q: Can this be set up to connect as an openvpn client?**
A: OpenVPN client support was added to the Grandstream HT812 firmware version 1.0.29.8 and later. This means that if your device is running firmware version 1.0.29.8 or later, you should be able to set up the HT812 as an OpenVPN client.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Compatible with Zen's UK "BT digital voice" switchover
*by T***E on 30 May 2023*

Bought as I'm a zen.co.uk customer, and have UniFi throughout the house (I don't use the Fritzbox). With the BT/UK "digital voice" switchover in full-swing, I wanted a means to keep our old land line alive. This worked perfectly. Configuration hasn't been utterly straight-forward, but I've finally found the following settings work (for Zen customers): - Ensure your NAT/firewall is forwarding the required ports through to the Grandstream (5060/UDP from 212.23.7.228, and 20000-30000/UDP from 62.3.88.0/28 and 62.3.88.16/28) - Primary SIP server: voip.zen.co.uk - Secondary SIP server: voip2.zen.co.uk - Prefer Primary SIP server: No - Outbound proxy: Blank/None - Allow DHCP Option 120: No - SIP Transport: UDP - NAT traversal: No - DNS Mode: A Record - DNS SRV: No - Fallback Timer: 60 - Use Request Routing ID in SIP INVITE Header: No - Sip Registration: Yes - Outgoing Call without Registration: Yes - Register Expiration: 5 - Enable SIP OPTIONS/NOTIFY keep alive: No - Local SIP port: 5060 - Local RTP port: 5004 - Random SIP port: No - Random RTP port: No - Enable RTCP: Yes - Hold Target Before Refer: Yes - Refer-To Use Target: No - Remove OBP: No - Support SIP Instance ID: Yes - Validate Incoming SIP Message: No - Use Privacy Header: No - Use P-Preferred-Identity Header: Yes - Use P-Access-Network-Info Header: Yes - Use P-Emergency-Info Header: Yes - Use P-Asserted-Identity Header: No - SIP REGISTER Contact Header Uses: LAN - Caller ID Fetch Order: Auto - DTMF: RFC2833 - SLIC: UK - Caller ID Scheme: SIN 227 - Dial Plan: (You may want to customise) ... { 999 | 10[015] | 11[129] | 11[68]xx | 1[45]7[1-2] | <0=44>8001111 | <0=44>845464x | <0=44>[1235789]xxxxxxxxx | <=441638>23456789]xxxxx | 1410[1235789]xxxxxxxxx | x+ }

### ⭐⭐⭐⭐⭐ Great way to save your landline number
*by D***W on 18 June 2024*

Although landlines are largely replaced with cell phones, you may have a reason to hold onto an old number. This was the case for us having owned a line for many years, but the rising costs had become unreasonable ($45/mo), just to keep a line that rarely gets used. I began looking at alternatives, and two stood out: give up the line entirely, or port the number to a VoIP provider. Some of you might say to port the number to a cell plan, but even $15 per month on a prepaid plan would feel wasteful. So, before ditching the line, I looked into VoIP, which honestly is a bit confusing. Some providers sell hardware/devices and bundle the service with that, others use stand-alone devices. I looked into the bundled service + device route first but those seem to have really bad customer service or quality of service reviews. Their pricing can also be quite deceptive on what you would actually pay. After that I saw a few recommendations for a VoIP provider based out of Canada as having great pricing and works with a variety of stand-alone devices like this Grandstream. I went this route and am very pleased with the result. For starters, my family can’t even tell anything changed. After a few days my landline number ported successfully to the new provider. Incoming and outgoing calls work just like they did before, and the sound quality seems the same. The Grandstream device itself works great. I am not using this as a router, I just plug it into an open LAN port on my network, and then run a line to my existing cordless home phone. It is small, doesn’t get very warm, and isn’t obnoxious with its indicator lights. Programming the device to connect with the VoIP provider did require following a guide, and the UI isn’t the best looking but gets the job done. The good thing is once you get it connected and working, you’ll probably never need to touch it again. Opportunities for improvement - Updating to the latest firmware is confusing – why is the wrong update URL set at the factory? I was able to update after finding instructions online. Also, the WebUI feels like a throwback to setting up an old router from the 90s.

### ⭐⭐⭐⭐⭐ Funciona, sólo para expertos en el área de redes
*by L***S on 24 April 2025*

Lo probé con Megacable conectando el módem a modo puente con este dispositivo usando la VLAN 559 y funciona de maravilla. Es importante que la cuenta SIP se puede tener activa en un dispositivo a la vez.

## Frequently Bought Together

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-07-24*