We remain fully operational. Our teams are working around the clock to ensure your deliveries continue safely.
DOWNLOAD THE APP
Copyright © 2025 Desertcart Holdings Limited
DOWNLOAD THE APP
Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.
📞 Power your legacy calls with next-gen speed and control!
The Grandstream HT ATA 812 is a powerful 2-port analog telephone adapter featuring dual FXS ports and an integrated Gigabit NAT router. Designed for professionals needing to maintain traditional landline functionality while leveraging modern VoIP technology, it offers extensive SIP configuration options, robust security features, and reliable backup/restore capabilities. Ideal for seamless integration in advanced home or office networks.
| ASIN | B01M2ZJQAF |
| Are Batteries Included | No |
| Batteries | 1 AAAA batteries required. |
| Best Sellers Rank | #19,916 in Computers ( See Top 100 in Computers ) #33 in Network Cards |
| Brand | Grandstream |
| Color | Black |
| Customer Reviews | 4.3 4.3 out of 5 stars (473) |
| 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 |
T**E
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+ }
L**X
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).
L**S
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.
M**K
Just been fitted. Very happy. Great idea if you don't want a normal house telephone line. Works great with Starlink.
A**N
Just works. Purchased to replace a PAP2T that wouldn't ring the bell on a rotary phone.
Trustpilot
2 months ago
1 month ago