--- product_id: 275914084 title: "HT ATA 812" brand: "grandstream" price: "Bs.2077" currency: BOB in_stock: true reviews_count: 5 category: "Grandstream" url: https://www.desertcart.bo/products/275914084-ht-ata-812 store_origin: BO region: Bolivia --- # Gigabit NAT router for ultra-fast data flow 2 FXS ports for legacy phone integration Advanced configurable SIP settings HT ATA 812 **Brand:** grandstream **Price:** Bs.2077 **Availability:** βœ… In Stock ## Summary > πŸ“ž Keep your calls crystal clear and your network blazing fast with HT ATA 812! ## Quick Answers - **What is this?** HT ATA 812 by grandstream - **How much does it cost?** Bs.2077 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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 - β€’ **Legacy Meets Future:** Seamlessly connect your classic landline phones with modern VoIP tech via 2 FXS ports. - β€’ **Plug & Play Packaging:** Arrives in sleek, secure packaging designed for hassle-free setup and maintenance. - β€’ **Blazing Fast Networking:** Integrated Gigabit NAT router ensures lightning-speed data routing without bottlenecks. - β€’ **Future-Proof Your Voice:** Stay ahead of the UK digital voice switchover with a device built to keep you connected. - β€’ **Customizable SIP Mastery:** Unlock full control with extensive SIP configuration options tailored for pros. ## Overview The Grandstream HT ATA 812 is a powerful 2-port analog telephone adapter featuring 2 FXS ports and an integrated Gigabit NAT router. Designed for professional-grade VoIP integration, it supports advanced SIP configurations to ensure seamless connectivity during the UK digital voice transition. Compact and easy to maintain, it’s the perfect bridge between legacy telephony and modern IP 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 | #51,737 in Computers ( See Top 100 in Computers ) #116 in Network Cards | | Brand | Grandstream | | Color | Black | | Customer Reviews | 4.3 4.3 out of 5 stars (475) | | 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/41P17muSytL.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 probΓ© con Megacable conectando el mΓ³dem 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? - 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.bo/products/275914084-ht-ata-812](https://www.desertcart.bo/products/275914084-ht-ata-812) --- *Product available on Desertcart Bolivia* *Store origin: BO* *Last updated: 2026-06-23*