VoIP telephone adapter Grandstream HT818

The Grandstream HT818 VoIP telephone adapter is an 8-port analog-to-VoIP gateway with 8 FXS ports and an integrated Gigabit NAT router. Designed for deployments that require reliable analog phone integration with SIP-based services, the HT818 supports multiple codecs (including G.711, G.723.1, G.726, G.729A/B, OPUS, iLBC), T.38 fax over IP, and provides LED indicators for LAN, Power and WAN. Its compact form factor and support for dual Gigabit network ports make it suitable for small offices and branch locations that need secure, high-quality voice services.

Advantages

The HT818 delivers wide-band HD voice quality, support for 3-way conferencing per port, and robust security including AES encryption and a unique security certificate per unit. It offers automated and secure provisioning (TR-069) and dual Gigabit ports for concurrent WAN/LAN connections, while its integrated NAT router improves network performance for enterprise deployments.

Suitable for

• Small offices and branch sites integrating analog phones with VoIP networks
• Service providers deploying multiple units with automated provisioning
• Locations requiring reliable Fax-over-IP (T.38) support
• Environments needing secure voice connections with AES and TLS/SIPS

Key specifications

• Model: Grandstream HT818 (MPN: HT818, EAN: 6947273702412)
• Ports: 8 FXS ports
• Network: Dual Gigabit Ethernet ports, integrated NAT router
• Codecs: G.711, G.723.1, G.726, G.729A/B, OPUS, iLBC
• Fax: T.38 Fax support
• Security: AES encryption, HTTPS, SIPS, SSL/TLS, unique device certificate
• Provisioning: TR-069 automated secure provisioning
• Other: 3-way conferencing per port, LED indicators for LAN/Power/WAN
• Dimensions & weight: 120 x 180 x 36 mm, 356 g

How to use

Physically connect analog telephones to the HT818’s FXS ports and link the device to your network using the Gigabit Ethernet ports. Configure SIP account credentials and network settings via the web management interface or use TR-069/auto-provisioning for centralized deployment. Ensure codecs and fax (T.38) settings match the requirements of your PBX or service provider, and verify LED indicators to confirm LAN, WAN and power status.

Recommendations

For optimal voice quality and reliability, place the HT818 behind a properly configured firewall and enable hardware NAT. Use secure provisioning and TLS/SIPS for SIP signaling and AES for media encryption. When deploying multiple units, employ TR-069 provisioning and unique certificates to maintain centralized management and device-level security.