---
product_id: 275914084
title: "HT ATA 812"
brand: "grandstream"
price: "Rp3032430"
currency: IDR
in_stock: true
reviews_count: 5
category: "Grandstream"
url: https://www.desertcart.id/products/275914084-ht-ata-812
store_origin: ID
region: Indonesia
---

# Gigabit NAT router for lightning-fast data flow 2 FXS ports for legacy phone integration Advanced configurable SIP settings HT ATA 812

**Brand:** grandstream
**Price:** Rp3032430
**Availability:** ✅ In Stock

## Summary

> 📞 Power your legacy calls with next-gen speed and control!

## Quick Answers

- **What is this?** HT ATA 812 by grandstream
- **How much does it cost?** Rp3032430 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/products/275914084-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

- • **Tailored SIP Configuration:** Unlock full control with extensive SIP options—customize your setup like a pro.
- • **Effortless Backup & Restore:** Never lose your settings—multiple backup options keep your configuration safe and sound.
- • **Robust Security & Encryption:** Protect your calls with advanced encryption features, ensuring privacy in every conversation.
- • **Seamless Legacy Phone Revival:** Keep your classic landline alive with dual FXS ports—no compromises on tradition or tech.
- • **Blazing Fast Gigabit NAT Router:** Experience ultra-smooth VoIP calls and data transfer with integrated gigabit speeds.

## Overview

The Grandstream HT ATA 812 is a powerful 2-port analog telephone adapter featuring dual FXS ports and an integrated Gigabit NAT router. Designed for professionals needing to maintain traditional landline functionality while leveraging modern VoIP technology, it offers extensive SIP configuration options, robust security features, and reliable backup/restore capabilities. Ideal for seamless integration in advanced home or office networks.

## 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: 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: We switched from Ooma to a SIP provider (VOIP.ms, but there are lots of others). We got a few more features and are saving a little money. This was a little tricky to setup (it has lots of settings). Most of the settings are fine if left at default, but it's capable of encrypting traffic and a whole bunch of other stuff and there are settings for every possible feature. In fact, there are five or six options to backup/restore the configuration (seems like any of them will work, though).

## Features

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M2ZJQAF |
| Are Batteries Included | No |
| Batteries | 1 AAAA batteries required. |
| Best Sellers Rank | #19,916 in Computers ( See Top 100 in Computers ) #33 in Network Cards |
| Brand | Grandstream |
| Color | Black |
| Customer Reviews | 4.3 4.3 out of 5 stars (473) |
| Date First Available | 17 November 2016 |
| Item Weight | 290 g |
| Item model number | HT-812 |
| Lithium Battery Energy Content | 2.6 Watt Hours |
| Lithium Battery Packaging | Batteries contained in equipment |
| Lithium Battery Weight | 5 Grams |
| Manufacturer | Grandstream |
| Number Of Lithium Ion Cells | 4 |
| Number of Ethernet Ports | 2 |
| Operating System | RouterOS |
| Power Source | Type C Plug (EU) |
| Product Dimensions | 22.86 x 33.02 x 7.11 cm; 290 g |
| Standing screen display size | 5 Inches |
| Voltage | 28 Volts |
| Wireless Carrier | Unlocked |

## Product Details

- **Brand:** Grandstream
- **Model Name:** HT812
- **Special Feature:** WPS
- **Compatible Devices:** Personal Computer
- **Recommended Uses For Product:** Security
- **Included Components:** 1
- **Connectivity Technology:** Ethernet
- **Item Weight:** 0.29 Kilograms
- **Number of Ports:** 2
- **Control Method:** Remote

## Images

![HT ATA 812 - Image 1](https://m.media-amazon.com/images/I/61IbQl+Lp+L.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

### ⭐⭐⭐⭐⭐ Review
*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+ }

### ⭐⭐⭐⭐⭐ Review
*by L***X on 23 October 2025*

We switched from Ooma to a SIP provider (VOIP.ms, but there are lots of others). We got a few more features and are saving a little money. This was a little tricky to setup (it has lots of settings). Most of the settings are fine if left at default, but it's capable of encrypting traffic and a whole bunch of other stuff and there are settings for every possible feature. In fact, there are five or six options to backup/restore the configuration (seems like any of them will work, though).

### ⭐⭐⭐⭐⭐ Review
*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

- Grandstream Powerful 2-Port ATA with Gigabit NAT Router
- Grandstream GS-HT814 4 Port Ata with 4 Fxs Ports and Gigabit NAT Router Voip Phone and Device, Black
- Grandstream 2-FXS Port Analog Telephone Adapter (HT802)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.id/products/275914084-ht-ata-812](https://www.desertcart.id/products/275914084-ht-ata-812)

---

*Product available on Desertcart Indonesia*
*Store origin: ID*
*Last updated: 2026-04-23*