Grandstream HT812 2-Port Analog Telephone Adapter with Gigabit NAT Router

The Grandstream HT812 is a two-port analog telephone adapter that brings traditional phones and fax machines onto a modern VoIP network without altering the way they are used. By offering two FXS ports, it lets you keep the handsets you already trust while gaining the flexibility and cost savings of SIP service.

An integrated Gigabit NAT router with dual Ethernet ports allows the adapter to sit at the heart of a small network, sharing high-speed connectivity with other devices and reducing the need for extra hardware. Whether you place it on a home desk or in a small office communications rack, setup remains straightforward thanks to automated provisioning through TR-069 or downloadable XML files.

Calls stay protected through TLS and SRTP encryption, so conversations remain private even when they travel across public networks. Centralized management through the Grandstream Device Management System makes it easy for IT teams or service providers to monitor large deployments, push updates, and troubleshoot from anywhere.

Support for 3-way voice conferencing and T.38 Fax-over-IP means the HT812 goes beyond basic dialing. Small businesses can run quick team huddles, while remote workers can send contracts by fax without searching for a phone line. The adapter also pairs naturally with Grandstream UCM IP PBXs, creating a cohesive platform for locations that blend IP and analog endpoints.

• Two FXS ports for connecting analog phones or fax machines
• Dual Gigabit Ethernet ports with a built-in NAT router
• TLS and SRTP encryption safeguard voice traffic
• Automated provisioning via TR-069 or XML files
• 3-way voice conferencing for quick team calls
• T.38 Fax-over-IP support keeps fax capability alive
• Seamless interoperability with Grandstream UCM IP PBXs
• Remote, centralized management through the GDMS platform