Grandstream HT812

Overview

The Grandstream HT812 is a two-port analog telephone adapter designed to connect traditional phones and fax machines to modern VoIP networks without changing how you use them. It features two FXS ports for your existing handsets and an integrated Gigabit NAT router with dual Ethernet ports, allowing it to serve as a central hub for small networks. This adapter supports secure voice communication with TLS and SRTP encryption and simplifies setup through automated provisioning methods.

Key features

• Two FXS ports enable connection of analog phones or fax machines, preserving your current devices while upgrading to VoIP.
• Built-in Gigabit NAT router with dual Ethernet ports shares high-speed internet with multiple devices, reducing the need for extra networking hardware.
• Secure voice calls with TLS and SRTP encryption protect conversations over public networks.
• Automated provisioning via TR-069 or downloadable XML files streamlines installation and configuration.
• 3-way voice conferencing supports quick team discussions without additional equipment.
• T.38 Fax-over-IP support maintains reliable fax transmission over IP networks.
• Seamless integration with Grandstream UCM IP PBXs creates a unified communication platform for mixed analog and IP environments.
• Remote centralized management through the Grandstream Device Management System (GDMS) allows IT teams to monitor, update, and troubleshoot devices efficiently.

Key specs

• Ports: 2 FXS analog telephone ports
• Ethernet: Dual Gigabit Ethernet ports with NAT router
• Security: TLS and SRTP encryption for voice traffic
• Provisioning: TR-069 and XML file support for automated setup
• Fax support: T.38 Fax-over-IP protocol
• Voice conferencing: 3-way conferencing capability

Connectivity and compatibility

The HT812’s dual Gigabit Ethernet ports allow it to connect directly to your internet modem and local network devices, providing both voice and data connectivity through a single unit. It supports standard SIP protocols, ensuring compatibility with a wide range of VoIP service providers and Grandstream UCM IP PBX systems. This makes it a flexible choice for small offices or home setups that need to integrate analog devices into an IP-based communication environment.

Installation and setup

Setting up the HT812 is straightforward thanks to its support for automated provisioning via TR-069 or XML configuration files. This reduces manual configuration time and helps maintain consistent settings across multiple devices. Its compact design fits easily on a desk or in a communications rack, making it suitable for both home offices and small business environments.

Ideal uses and environments

This adapter is well suited to small businesses and remote workers who want to keep their existing analog phones and fax machines while upgrading to VoIP technology. It works well in home offices, small office networks, and locations that require secure voice communication and reliable fax transmission. The ability to manage devices remotely also makes it a strong choice for IT teams overseeing multiple deployments.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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