---
product_id: 155703752
title: "HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN"
brand: "grandstream"
price: "R3545"
currency: ZAR
in_stock: true
reviews_count: 6
category: "Grandstream"
url: https://www.desertcart.co.za/products/155703752-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway-wan
store_origin: ZA
region: South Africa
---

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

**Brand:** grandstream
**Price:** R3545
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN by grandstream
- **How much does it cost?** R3545 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/155703752-ht812-2-fxs-analog-telephone-adapter-voip-fax-gateway-wan)

## 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:** Protect your conversations with advanced TLS and SRTP encryption—privacy guaranteed.
- • **Failover SIP Server Support:** Stay connected with automatic switch to secondary SIP server if the primary fails.
- • **Effortless Enterprise Deployment:** Automated provisioning via TR-069 and XML config files means zero-hassle scaling.
- • **Seamless Analog-to-VoIP Integration:** Connect your legacy phones effortlessly to modern VoIP networks with 2 FXS ports.
- • **Blazing Fast Dual Gigabit Connectivity:** Experience ultra-reliable call quality and data routing at speeds up to 100Mbps.

## Overview

The Grandstream HT812 is a professional-grade VoIP analog telephone adapter featuring 2 FXS ports and dual Gigabit Ethernet ports with a built-in NAT router supporting up to 100Mbps routing speeds. It ensures secure communications through TLS and SRTP encryption and simplifies large-scale deployments with automated provisioning options like TR-069 and XML configuration. Ideal for businesses aiming to integrate traditional analog phones into modern VoIP networks without compromising on speed, security, or reliability.

## 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 | #392,487 in Electronics ( See Top 100 in Electronics ) #2 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 Protocol | SIP |
| Connectivity Technology | Ethernet |
| Control Method | App |
| Country of Origin | China |
| Customer Reviews | 4.3 out of 5 stars 481 Reviews |
| Data Transfer Rate | 100 Megabits Per Second |
| Frequency Band Class | Single-Band |
| Global Trade Identification Number | 06947273702153 |
| Has Internet Connectivity | Yes |
| 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 … |
| Router Network Type | wired |
| 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 |
| Wireless Communication Standard | 802.11a |
| Wireless Compability | 802.11a |

## 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

![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+ }

### ⭐⭐⭐⭐⭐ Quality Product
*by A***R on 12 September 2023*

Unlike other similar devices, this product was easy to setup. Took in total approx 15 min start to finish. The phone quality is great,. I have had this running now for over 4 months without any issues. There are cheaper products available, but the value for the service and easy of operation is what stands out for me.

## 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)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-08-18*