The HT841/881 FXO gateway series is the ideal solution for businesses of all sizes looking to create an easy-to-deploy VoIP network, seamlessly connecting multiple locations and devices within an office to any hosted or on-premise IP PBX network. The HT881 is the 8-port model in the series, making it well suited to small and medium businesses with multiple active PSTN or Telkom lines that need to remain operational alongside a modern VoIP platform.

Key Highlights

• 8× RJ11 FXO ports and 1× RJ11 FXS port
• Supports 3 SIP profiles across the FXS and FXO ports
• 2× 10/100/1000 Mbps RJ45 ports — one with 802.3af PoE-PD support
• Powered via PoE, optional PoE injector, or optional 12V power supply (sold separately)
• Designed and tested for full interoperability with leading IP PBXs, soft-switches, and SIP-based environments

NAT Router & Lifeline Support

The HT881 includes a high-performance NAT router, providing basic routing and network edge protection without the need for a separate device in smaller deployments. Critically for environments where telephony uptime is essential, lifeline support hard-relays the FXS port to an FXO port in case of a power outage — meaning a connected analogue phone can still make and receive PSTN calls even when power or internet is disrupted. This is a particularly practical feature for South African deployments where load shedding and connectivity interruptions are real-world concerns.

• Built-in high-performance NAT router for edge protection
• PSTN lifeline support — enables calls via the FXS port over PSTN in the event of power or internet outage
• Failover SIP server automatically switches to a secondary server if the primary loses connection
• Up to 1000 Mbps in bridge mode; up to 100 Mbps in NAT mode

Fax, Codec & Telephony Feature Support

T.38 fax support enables reliable Fax-over-IP transmission, while a broad codec selection ensures voice quality and compatibility across different VoIP infrastructure configurations. 3-way voice conferencing is supported per port, adding a useful collaboration capability for small teams using connected analogue handsets.

• T.38 Fax-over-IP for reliable fax transmission over VoIP
• G.711, G.723, G.726, G.729, iLBC and additional codec support
• 3-way voice conferencing per port
• Caller ID, call waiting, call transfer, call forward, and do not disturb
• Flexible dial plans for call routing control

Security & Easy Management

Strong AES encryption with a unique security certificate per unit protects all calls and account credentials. Automated and secure provisioning via TR-069 makes mass deployment straightforward, and the HT881 is compatible with GDMS — Grandstream’s free cloud management platform — for centralised configuration, firmware management, and monitoring alongside other Grandstream devices.

• AES encryption with per-unit unique security certificate
• TLS and SRTP for secure call transmission
• TR-069, HTTP/HTTPS, and TFTP provisioning options
• GDMS compatible for free centralised cloud management
• Simple web UI for standalone configuration

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