Grandstream HT841 – 4 Port FXO VoIP Gateway with FXS & Gigabit NAT Router
The Grandstream HT841 FXO Gateway is a hybrid VoIP solution featuring 4 FXO ports and 1 FXS port, designed to connect PSTN lines and analog devices to SIP-based networks. With dual Gigabit Ethernet, built-in NAT router, SIP failover, and T.38 fax support, it is ideal for businesses transitioning from traditional telephony to modern VoIP systems.
Description
The Grandstream HT841 FXO Gateway is a reliable and high-performance analog VoIP gateway designed to integrate traditional PSTN lines into modern SIP-based communication systems. With 4 FXO ports and 1 FXS port, it enables businesses to connect multiple analog trunk lines while also supporting an analog phone or fax device.
The Grandstream HT841 FXO Gateway supports up to three SIP profiles, allowing registration with multiple SIP servers for redundancy and flexible routing across different VoIP providers. This ensures seamless communication and high availability for business-critical operations.
Equipped with dual Gigabit Ethernet ports and an integrated NAT router, the device simplifies deployment while delivering fast and stable network performance. It also includes lifeline support, enabling the FXS port to connect directly to an FXO port in case of power or network failure, ensuring continued PSTN communication.
The gateway supports a wide range of voice codecs, including G.711, G.723.1, G.726, G.729, iLBC, and OPUS, ensuring high-quality voice transmission even under varying network conditions. It also offers T.38 Fax-over-IP, allowing reliable fax communication with automatic fallback to G.711.
Advanced telephony features such as caller ID (multi-format), call waiting, call transfer, call forwarding, hold, Do Not Disturb (DND), and 3-way conferencing enhance productivity and usability across all connected devices.
Security is enterprise-grade, with support for TLS, SRTP, HTTPS encryption, and AES-secured provisioning, ensuring that both signaling and voice data are protected. Automated deployment is simplified through TR-069 and XML configuration, making the HT841 ideal for scalable installations.
With failover SIP server support, flexible management via web GUI, SSH, Telnet, and syslog, and a compact, easy-to-install design, the Grandstream HT841 FXO Gateway is the perfect solution for businesses seeking to bridge legacy telephony systems with modern VoIP infrastructure while maintaining reliability and security.
Telephony Interfaces:
- 4 × FXO ports (RJ11) for PSTN lines
- 1 × FXS port (RJ11) for analog phone/fax
- Lifeline PSTN fallback (FXS to FXO)
Network & Connectivity:
- 2 × Gigabit Ethernet (10/100/1000 Mbps)
- Built-in NAT router
- PoE-PD support (802.3af on one port)
- VLAN & QoS (802.1Q, ToS, DiffServ)
Voice & Codec Support:
- G.711 (PLC/VAD/CNG)
- G.723.1
- G.726
- G.729
- iLBC
- OPUS
Fax & DTMF:
- T.38 Fax-over-IP (Group 3)
- G.711 fallback
- DTMF: In-audio, RFC2833, SIP INFO
Telephony Features:
- Caller ID (Bellcore, ETSI, BT, NTT, DTMF)
- Call waiting
- Call transfer & forwarding
- Hold, Do Not Disturb (DND)
- 3-way conferencing
Reliability & Performance:
- 3 SIP profiles for redundancy
- SIP failover support
- Dynamic jitter buffer
- Advanced echo cancellation
Security Features:
- TLS / SRTP encryption
- HTTPS secure management
- AES encrypted configuration
- Secure provisioning (TR-069, XML)
Management & Provisioning:
- Web GUI
- TR-069 provisioning
- XML configuration
- SSH / Telnet / Syslog
Hardware & Design:
- LED indicators: Power, NET1, NET2, FXS, FXO
- Factory reset button
- Compact desktop design
Power & Environment:
- Power: PoE (802.3af) or 12V DC adapter
- Operating temperature: 0°C to 40°C
- Humidity: 10% to 90% non-condensing
- Dimensions: ~190 × 100 × 28 mm
- Weight: ~0.46 kg
Key Features:
- 4 FXO + 1 FXS Ports – Hybrid PSTN and analog support
- Dual Gigabit Ethernet – High-speed connectivity
- Built-in NAT Router – Simplified network deployment
- 3 SIP Profiles – Flexible routing & redundancy
- T.38 Fax Support – Reliable fax over IP
- PSTN Lifeline Failover – Continuous communication
- Advanced Telephony Features – Full call management
- Enterprise Security – TLS, SRTP, HTTPS, AES
- Easy Deployment – TR-069 & centralized provisioning
Technical Datasheet
You can download the full technical documentation for this product from the link below:
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