--- product_id: 50395851 title: "Grandstream HT-812 2FXS Gateway, Black" brand: "grandstream" price: "FREE" currency: EUR in_stock: false reviews_count: 13 url: https://www.desertcart.be/products/50395851-grandstream-ht-812-2fxs-gateway-black store_origin: BE region: Belgium --- # Dual Gigabit ports for lightning-fast connectivity 2 FXS ports for analog device integration TLS & SRTP encryption for secure calls Grandstream HT-812 2FXS Gateway, Black **Brand:** grandstream **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > πŸ“ž Elevate your office calls with secure, lightning-fast VoIP connectivity! ## Quick Answers - **What is this?** Grandstream HT-812 2FXS Gateway, Black by grandstream - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/50395851-grandstream-ht-812-2fxs-gateway-black) ## 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 - β€’ **Built-in NAT Router:** Simplify your setup with an integrated NAT router that handles routing without extra hardware. - β€’ **Rock-Solid Call Security:** Advanced TLS and SRTP encryption protect your calls and accounts from eavesdropping. - β€’ **Trusted Global Technology:** Join millions worldwide using Grandstream’s market-leading SIP ATA technology for crystal-clear voice quality. - β€’ **Blazing Fast Network Performance:** Dual Gigabit ports ensure ultra-reliable, high-speed data routing up to 100Mbps. - β€’ **Seamless Analog-to-VoIP Integration:** Connect your legacy phones effortlessly with 2 SIP profiles via 2 FXS ports. ## Overview The Grandstream HT-812 2FXS Gateway is a compact, powerful ATA device designed to bridge analog phones with modern VoIP networks. Featuring 2 FXS ports, dual Gigabit Ethernet, a built-in NAT router, and advanced TLS/SRTP encryption, it delivers exceptional voice quality and secure communication for home and office environments. ## Description Product Description The HT812 provides powerful VoIP technology and routing capabilities for home and office environments, enabling users to successfully connect their analog devices with a manageable and powerful VoIP network. This powerful ATA is based on Grandstream market-leading SIP ATA/gateway technology and has been successfully used with millions of units worldwide. It offers exceptional voice quality in various applications and environments. The HT812 features 2 user-friendly FXS ports, an integrated gigabit nat-router, state-of-the-art encryption with a security certificate per unit. Box Contains Grandstream HT812 2FXS Gateway 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 Device for VOIP phone calls but software UI is terrible. - The device works perfectly since Vodafone switched to VOIP Phone. I didnt want to use the terrible router which doesnt support bridge mode either. This device is a great solution to continue using my custom router. However, the firmware UI is the major and only downside to using this device. It has the worst UI I have ever seen compared to other Grandstream products and possibly every other routers and ATA firmware UIs I've seen. I stand corrected when I thought D-Link had the worst UI. Its as if it was built out of Adobe's Dreamweaver from back in the old days. I'll change my review, if Grandstream fixes this. Aside from the horrible UI, the setup process is deceptively simple. It looks bloated with many options but you only need a few to set it up. Some general tips for anyone setting up for Vodafone Broadband. However, this may get outdated/changed from the time of writing: -The device doesnt come with a manual so use the Grandstream Documenation on the official website. Just type 'grandstream HT812' on google and click on the link that leads you to official grandstream product page. From there, just look for anything that will lead you to HT812/HT814 user manual as websites get updated and location may change. -For vodafone setup configuration, type 'Landline phone with own router on FTTP' on google and look for anything that will take you to the vodafone forums. Once you ahve reached the forum thread, go to page 9 and scroll down until you see setup instructions. ## 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01M2ZJQAF | | Best Sellers Rank | 93,222 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 709 in Routers | | Guaranteed software updates until | unknown | | Item model number | HT-812 | | Language | Dutch | | Manufacturer | Grandstream | | Product Dimensions | 22.86 x 33.02 x 7.11 cm; 290 g | ## 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-812 2FXS Gateway, Black - Image 1](https://m.media-amazon.com/images/I/51ZE9wX64GS.jpg) ## Questions & Answers **Q: Are you able to supply plugs/adaptors for use in the eu and/or us with this item?** A: Either, I believe. **Q: Can this work with Cisco phone system?** A: Not clear what you mean by "Cisco phone system". The Grandstream HT-812 is an ATA (Analogue Telephone Adapter). You connect it to your internet router via ethernet cable. You plug in two phones or similar (eg CO ports on a PABX). It provides Voice over IP service from the likes of SIPgate. It's configured via a web interface. **Q: Can you connect dialup modems to this? i would like to simulate a dialup isp for an old computer.** A: I am not sure that anyone would have attempted to use a dial-up modem over VOIP but there has to be a first time however unlikely. The HT-812 supports fax so I can see no reason why it would not work with an acoustic modem so I think I would go ahead and try. There is a single channel version which is cheaper so would provide a cheaper option. If you do try, do post the answer in a review because I would be interested in the outcome! **Q: What is the difference between the ht812 & the ht802?** A: The HT812 has an integrated Gigabit NAT router and the HT802 does not. You don't need to use the integrated Gigabit NAT router, it can de disabled and it will work in the exact same way as the HT802. ## 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 Device for VOIP phone calls but software UI is terrible. *by I***Y on 21 May 2023* The device works perfectly since Vodafone switched to VOIP Phone. I didnt want to use the terrible router which doesnt support bridge mode either. This device is a great solution to continue using my custom router. However, the firmware UI is the major and only downside to using this device. It has the worst UI I have ever seen compared to other Grandstream products and possibly every other routers and ATA firmware UIs I've seen. I stand corrected when I thought D-Link had the worst UI. Its as if it was built out of Adobe's Dreamweaver from back in the old days. I'll change my review, if Grandstream fixes this. Aside from the horrible UI, the setup process is deceptively simple. It looks bloated with many options but you only need a few to set it up. Some general tips for anyone setting up for Vodafone Broadband. However, this may get outdated/changed from the time of writing: -The device doesnt come with a manual so use the Grandstream Documenation on the official website. Just type 'grandstream HT812' on google and click on the link that leads you to official grandstream product page. From there, just look for anything that will lead you to HT812/HT814 user manual as websites get updated and location may change. -For vodafone setup configuration, type 'Landline phone with own router on FTTP' on google and look for anything that will take you to the vodafone forums. Once you ahve reached the forum thread, go to page 9 and scroll down until you see setup instructions. ### ⭐⭐⭐⭐⭐ Provided introduction to VOIP *by C***S on 29 January 2022* The imminent arrival of FTTP prompted the investigation of VOIP to allow the ditching of the increasingly expensive landline which is now only used by ageing relatives and neighbours who have not moved to mobile. Since I do not intend to make outgoing calls, Sipgate provides a low cost (free), local number to which I can later migrate my BT number if it works well (at additional cost). The HT-812 allows the use of my existing analogue phones to assess the performance/reliability of VOIP as an alternative to the existing copper landline so I can use the money saved to pay for fast FTTP. Configuration is somewhat daunting due to the huge number of settings in the configuration GUI but only a few need changing. After updating the firmware to the latest version (see online manual) there are even more options available but most VOIP providers do supply settings for this series of adapters as well as the SIP codes, passwords etc. I also made these additional changes to make my phones sound like BT phones rater than US ones. In Advance Settings:- System ring cadence: c=400/200-400/2000; Dial tone: f1=350@-19,f2=450@-22,c=0/0; You will need one (or two) RJ11 (male) to BT (female) adapters in order to plug in your existing phones. For traditional phones these need to be masters including the ring capacitor. For modern DECT base stations the capacitor does not seem to be required. For my experiment I had to resort to adding some old ADSL filters which contain the ring capacitor, to my adapter cables. So to the results. The HT812 works perfectly. Audio quality is better than the landline but otherwise I can see no difference. I will have to see what the reliability of the VOIP service is but for the very low number of calls it will probably not matter. I will be migrating my BT number and then will enjoy not having to pay the line rental costs which will soon recoup the cost of the HT812! Do remember that migrating your number will cease the existing copper line and all services including ADSL/FTTC. If this appears too complex a process then it might be better to pay for Digital Voice (the same thing but configured by your ISP), but for my use case the VOIP gateway is an attractive option. ## 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? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/50395851-grandstream-ht-812-2fxs-gateway-black](https://www.desertcart.be/products/50395851-grandstream-ht-812-2fxs-gateway-black) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-08-22*