---
product_id: 155703752
title: "Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN"
brand: "grandstream"
price: "816.96 DT"
currency: TND
in_stock: true
reviews_count: 6
category: "Grandstream"
url: https://www.desertcart.tn/products/155703752-grandstream-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway
store_origin: TN
region: Tunisia
---

# Dual Gigabit WAN/LAN ports 2 FXS ports for analog devices TLS & SRTP call encryption Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN

**Brand:** grandstream
**Price:** 816.96 DT
**Availability:** ✅ In Stock

## Summary

> 📞 Stay connected, secure, and ahead with Grandstream HT812 — the VoIP gateway that means business.

## Quick Answers

- **What is this?** Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN by grandstream
- **How much does it cost?** 816.96 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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 Security:** Advanced TLS and SRTP encryption protect your calls and accounts from eavesdropping.
- • **Failover Reliability:** Automatic SIP server failover keeps your calls connected even if the primary server drops.
- • **Blazing Fast Network Performance:** Dual Gigabit ports and built-in NAT router deliver up to 100Mbps routing speeds for smooth communication.
- • **Effortless Large-Scale Deployment:** Automated provisioning via TR-069 and XML config files means zero-hassle setup and management.
- • **Seamless Analog-to-VoIP Integration:** Connect your legacy phones effortlessly to modern VoIP networks with 2 FXS ports.

## Overview

The Grandstream HT812 is a professional-grade analog telephone adapter and VoIP gateway featuring 2 FXS ports, dual Gigabit WAN/LAN ports, and a built-in NAT router capable of 100Mbps routing speeds. It supports 2 SIP profiles, advanced TLS and SRTP encryption for secure calls, and automated provisioning options (TR-069, XML) for easy deployment. Ideal for home offices and businesses looking to integrate legacy analog phones into modern VoIP networks with reliable failover and excellent voice quality.

## 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: 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+ }

## 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 |
| Antenna Location | Business |
| Best Sellers Rank | #365,354 in Electronics ( See Top 100 in Electronics ) #3 in VoIP Routers |
| Box Contents | Analog telephone adaptor, network cable, power adaptor and stand |
| Brand | Grandstream |
| Brand Name | Grandstream |
| Colour | Black |
| Compatible Devices | Laptop, Personal Computer, Smart Television, Smartphone, Tablet |
| Connectivity Technology | Ethernet |
| Control Method | App |
| Country of Origin | China |
| Customer Reviews | 4.3 out of 5 stars 476 Reviews |
| Data Transfer Rate | 100 Megabits Per Second |
| Frequency Band Class | Single-Band |
| Global Trade Identification Number | 06947273702153 |
| Is Electric | No |
| Item Dimensions L x W x H | 33L x 22.9W x 7.1H Centimeters |
| Item Weight Unit of Measure | 0.29 Kilograms |
| LAN Port Bandwidth | 10/100/1000 megabits per second |
| Manufacturer | Grandstream, Grandstream Networks |
| Manufacturer Contact Information | Grandstream Networks |
| Manufacturer Part Number | HT-812 |
| Maximum Upstream Data Transfer Rate | 100 Megabits Per Second |
| Model Name | HT812 |
| Model Number | HT-812 |
| Number of Ports | 2 |
| Operating System | RouterOS |
| Other Special Features of the Product | 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 … |
| Recommended Uses For Product | Business |
| Security Protocol | AES |
| Special Feature | 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 wide range of caller ID formats, TLS and SRTP security encryption technology to protect calls and accounts, Use with Grandstream’s UCM series of IP PBXs for Zero Configuration provisioning Special Feature 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 wide range of caller ID formats, TLS and SRTP security encryption technology to protect calls and accounts, Use with Grandstream’s UCM series of IP PBXs for Zero Configuration provisioning See more |
| UPC | 753459331842 |
| Unit Count | 1.00 Count |
| 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/51ZE9wX64GS.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

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-10*