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📞 Power your legacy calls with next-gen speed and security!
The Grandstream HT ATA 812 is a professional-grade 2-port analog telephone adapter featuring dual FXS ports and an integrated Gigabit NAT router. Designed for seamless integration with legacy phone systems and modern VoIP networks, it supports advanced AES security and is optimized for UK’s BT digital voice switchover. Lightweight and easy to configure, it delivers reliable, high-quality voice communication with robust firewall protection, making it ideal for both business and home environments.
| ASIN | B01M2ZJQAF |
| Antenna Location | Business, Home |
| Antenna Type | Fixed |
| Best Sellers Rank | #56,029 in Computers ( See Top 100 in Computers ) #112 in Network Cards |
| Brand | Grandstream |
| Built-In Media | 1 |
| Color | Black |
| Compatible Devices | Personal Computer |
| Compatible devices | Personal Computer |
| Connectivity Protocol | SIP |
| Connectivity Technology | Ethernet |
| Control Method | Remote |
| Customer Reviews | 4.3 out of 5 stars 478 Reviews |
| Data Transfer Rate | 100 Megabits Per Second |
| Frequency Band Class | Dual-Band |
| Frequency band class | Dual-Band |
| Global Trade Identification Number | 06947273702153 |
| Has Internet Connectivity | Yes |
| Has Security Updates | Yes |
| Is Electric | No |
| Is Modem Compatible | Yes |
| Item Dimensions L x W x H | 33L x 22.9W x 7.1H centimeters |
| Item Weight | 0.29 Kilograms |
| LAN Port Bandwidth | 10/100/1000 megabits per second |
| Manufacturer | Grandstream |
| Maximum Upstream Data Transfer Rate | 100 Megabits Per Second |
| Mfr Part Number | HT-812 |
| Model Name | HT-812 |
| Model Number | HT-812 |
| Model name | HT-812 |
| Number of Items | 1 |
| Number of Ports | 2 |
| Operating System | RouterOS |
| Other Special Features of the Product | WPS |
| Recommended uses for product | Business, Home |
| Router Firewall Security Level | Advanced |
| Router Network Type | cable |
| Security Protocol | AES |
| Special features | WPS |
| UPC | 753459331842 |
| Unit Count | 1 Count |
| Voltage | 28 Volts |
| Warranty Description | 1 |
T**E
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] | <0=44>8001111 | <0=44>845464x | <0=44>[1235789]xxxxxxxxx | <=441638>23456789]xxxxx | 1410[1235789]xxxxxxxxx | x+ }
A**R
Quality Product
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.
L**S
Funciona, sólo para expertos en el área de redes
Lo probé con Megacable conectando el módem 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.
X**R
GrandStream HT812 ATA works great for VoIP
Really great product for VoIP. Used multiple phones from old TrimLine to Panasonic wireless phones. Once you get the dozen or so options (out of a couple hundred) correctly set your good to go. You do need a solid internet connection and when power goes out the phone also goes out unless you have both your internet devices and the GrandStream on a power backup. I have a HT812 on Quantum Fiber.
M**K
Works great with Starlink
Just been fitted. Very happy. Great idea if you don't want a normal house telephone line. Works great with Starlink.
Trustpilot
1 month ago
2 weeks ago