---
product_id: 155703752
title: "Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN"
brand: "grandstream"
price: "฿11383"
currency: THB
in_stock: true
reviews_count: 6
category: "Grandstream"
url: https://www.desertcart.co.th/products/155703752-grandstream-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway
store_origin: TH
region: Thailand
---

# Dual Gigabit ports with 100Mbps NAT router 2 FXS ports for analog devices TLS & SRTP encryption for secure calls Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN

**Brand:** grandstream
**Price:** ฿11383
**Availability:** ✅ In Stock

## Summary

> 📡 Future-proof your calls with Grandstream HT812 — where legacy meets lightning-fast VoIP!

## Quick Answers

- **What is this?** Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN by grandstream
- **How much does it cost?** ฿11383 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/155703752-grandstream-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway)

## 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

- • **Rock-Solid Call Security:** State-of-the-art TLS and SRTP encryption protect your conversations and credentials from prying eyes.
- • **Failover SIP Server Reliability:** Stay connected with automatic switch to secondary SIP server if the primary goes down—no dropped calls, no drama.
- • **Blazing Fast Network Performance:** Dual Gigabit ports paired with a 100Mbps NAT router ensure your calls and data flow without a hitch.
- • **Seamless Analog-to-VoIP Integration:** Keep your legacy phones alive with 2 FXS ports, bridging old-school charm and modern VoIP power.
- • **Effortless Enterprise-Grade Provisioning:** Automated TR-069 and XML config support make mass deployment and management a breeze.

## Overview

The Grandstream HT812 is a professional-grade VoIP analog telephone adapter featuring 2 FXS ports for connecting legacy phones, dual Gigabit Ethernet ports with a built-in NAT router supporting up to 100Mbps routing speeds, and advanced TLS/SRTP encryption for secure voice communication. Designed for both home and office environments, it supports automated provisioning via TR-069 and XML config files, ensuring scalable deployment and reliable failover SIP server functionality for uninterrupted connectivity.

## Description

The HT812 delivers powerful VoIP technology and routing capabilities to home and office environments, and allows users to successfully connect their analog devices to a manageable and powerful VoIP network. Built using Grandstream’s market-leading SIP ATA/gateway technology, with millions of units successfully deployed worldwide, this powerful ATA features exceptional voice quality in various applications and environments. The HT812 comes with 2 easy-to-use FXS ports, an integrated Gigabit NAT router, state-of-the-art encryption with a unique security certificate per unit, automated provisioning for volume deployment and device management and outstanding network performance.

Review: Not worthy - After few hours in working, not getting incoming calls
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+ }

## Features

- Supports 2 SIP profiles through 2 FXS ports and dual Gigabit ports
- Includes a built-in NAT router which can handle routing speeds up to 100MBps
- TLS and SRTP security encryption technology to protect calls and accounts
- Automated provisioning options include TR-069 and XML config files

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M2ZJQAF |
| Batteries | 1 AAAA batteries required. |
| Batteries Included | No |
| Batteries Required | No |
| Best Sellers Rank | #324,790 in Electronics ( See Top 100 in Electronics ) #1 in VoIP Routers |
| Brand | Grandstream |
| Colour Screen | No |
| Compatible Devices | Laptop, Personal Computer, Smart Television, Smartphone, Tablet |
| Connector Type | Ethernet |
| Country of Origin | China |
| Customer Reviews | 4.3 4.3 out of 5 stars (470) |
| Data Transfer Rate | 100 Megabits Per Second |
| Date First Available | 17 November 2016 |
| Does it contain liquid? | No |
| Has Auto Focus | No |
| Imported By | Pure Life office system |
| Includes Rechargeable Battery | No |
| Includes remote | No |
| Item Dimensions LxWxH | 22.9 x 33 x 7.1 Centimeters |
| Item Weight | 290 g |
| Item model number | HT-812 |
| Manufacturer | Grandstream |
| Model | HT-812 |
| Model Year | 2016 |
| Mounting Hardware | Analog telephone adaptor, network cable, power adaptor and stand |
| Net Quantity | 1.00 Count |
| Number of Ports | 2 |
| Operating System | RouterOS |
| Product Dimensions | 22.86 x 33.02 x 7.11 cm; 290 g |
| Programmable Buttons | No |
| Special Features | Automated provisioning options include TR-069 and XML config files, Failover SIP server automatically switches to secondary server if main server loses connection, Includes a built-in NAT router which can handle routing speeds up to 100MBps, Supports 2 SIP profiles through 2 FXS ports and dual Gigabit ports, Supports 3-way voice conferencing, Supports T.38 Fax for creating Fax-over-IP, Supports a … |
| Standing screen display size | 5 Inches |
| Voltage | 28 Volts |

## 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

![Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN - Image 1](https://m.media-amazon.com/images/I/61IbQl+Lp+L.jpg)
![Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN - Image 2](https://m.media-amazon.com/images/I/61YTEysgAuL.jpg)
![Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN - Image 3](https://m.media-amazon.com/images/I/61tYGZjAhIL.jpg)

## Questions & Answers

**Q: Can i use this as a sip server to have my land line as a trunk and use smartphones with sip client to make calls??**
A: You need an IP PBX for connecting your PSTN line, HT812 is a 2 port FXS Gateway which is used for connecting analog Phones & work analog phone into IP Platform.

**Q: Can this product be used for connecting pstn (pots) to an asterisk server for integrating ivrs?**
A: Yes, you can

## Customer Reviews

### ⭐⭐ Not worthy
*by A***R on 29 December 2018*

After few hours in working, not getting incoming calls

### ⭐⭐⭐⭐⭐ 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).

## 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.co.th/products/155703752-grandstream-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway](https://www.desertcart.co.th/products/155703752-grandstream-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway)

---

*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-03-07*