Grandstream HT818 V2
The Grandstream HT818 V2 is an 8-port analog telephone adapter and VoIP gateway designed to connect multiple analog phones, fax machines, and compatible legacy telephony devices to a modern SIP-based communications system. Eight RJ11 FXS ports provide dedicated analog connections, while two Gigabit Ethernet ports and an integrated high-performance NAT router allow the HT818 V2 to combine analog-to-VoIP conversion with flexible network connectivity in a compact deployment.
Designed for offices, service providers, multi-site businesses, hospitality environments, and other installations with multiple analog endpoints, the HT818 V2 supports two SIP profiles, wideband HD voice codecs, T.38 Fax-over-IP, 3-way conferencing on each port, automatic SIP server failover, advanced telephony features, and secure automated provisioning. Grandstream Device Management System support also enables centralized cloud-based provisioning, configuration, monitoring, firmware management, and troubleshooting for scalable deployments.
Key Features
- 8 RJ11 FXS ports for analog phones, fax machines, and compatible analog devices
- 2 SIP profiles
- 2 x 10/100/1000 Mbps Gigabit Ethernet ports
- Integrated high-performance NAT router
- 3-way voice conferencing per FXS port
- Wideband HD voice codec support
- G.722 and Opus wideband voice codecs
- T.38 Group 3 Fax-over-IP support
- Automatic G.711 fax pass-through
- Automatic SIP server failover to a secondary server
- Caller ID display and blocking support
- Blind and attended call transfer
- Call waiting, forwarding, hold, and do not disturb
- Flexible dial-plan support
- GR-909 line-testing functionality
- Automated and secure provisioning
- TR-069 provisioning support
- SRTP media encryption
- TLS, SIPS, and HTTPS security
- Strong AES encryption with a unique security certificate per device
- Grandstream Device Management System support
Applications & Use Cases
- Connecting up to eight analog telephones to a SIP-based VoIP system
- Small and medium business analog-to-VoIP migration
- Hosted VoIP service deployments
- On-premise IP PBX installations
- Grandstream UCM series IP PBX deployments
- Service-provider ATA deployments
- Multi-site business communications
- Hotels and hospitality properties using analog room phones
- Apartment, MDU, and multi-tenant communications environments
- Healthcare and assisted-living facilities
- Schools, offices, and administrative facilities
- Connecting compatible analog fax machines to VoIP services
- Preserving existing analog phones during a transition to SIP communications
- Deployments requiring both analog voice conversion and Gigabit network connectivity
- Remote or high-volume deployments requiring centralized device management
Technical Specifications
Interfaces & Connectivity
- Manufacturer: Grandstream
- Model: HT818 V2
- Product Type: Analog Telephone Adapter / FXS VoIP Gateway
- Telephone Interfaces: 8 x RJ11 FXS Ports
- SIP Profiles: 2
- Network Interfaces: 2 x RJ45 Ethernet Ports
- Ethernet Speed: 10/100/1000 Mbps
- Integrated Router: High-Performance NAT Router
- Default NET1 Function: WAN / DHCP Client
- Default NET2 Function: LAN / DHCP Server
- Configurable Network Ports: NET1 and NET2 Roles Can Be Changed Through the Web Interface
- Factory Reset Button: Yes
- LED Indicators: Power, NET1, NET2, Phone 1 Through Phone 8
Voice, Fax & Telephony
- Voice Codecs: G.711, G.722, G.723.1, G.729A/B, G.726-32, iLBC, Opus
- Packet Loss Concealment: G.711 Annex I
- Voice Activity Detection / Comfort Noise Generation: G.711 Annex II
- Jitter Buffer: Dynamic
- Echo Cancellation: Advanced Line Echo Cancellation
- Fax over IP: T.38 Group 3 Fax Relay up to 14.4 kbps
- Fax Pass-Through: Automatic G.711 Fax Pass-Through
- 3-Way Conferencing: Supported Per Port
- Caller ID: Bellcore Type 1 and 2, ETSI, BT, NTT, DTMF-Based CID
- Call Transfer: Blind and Attended
- Call Forwarding: Supported
- Call Waiting: Supported
- Call Hold: Supported
- Do Not Disturb: Supported
- Dial Methods: DTMF, Pulse
- DTMF Methods: In-Audio, RFC2833, SIP INFO
- Disconnect Methods: Busy Tone, Polarity Reversal/Wink, Loop Current
- Ring Load: 2 REN, Up to 1 km on 24 AWG Line
- GR-909 Line Testing: Supported
Network & SIP
- SIP: SIP V2.0 / RFC3261
- SIP Transport: TCP, TLS
- Network Protocols: TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SSH, Telnet, STUN, SIP, SNMP, TR-069, IMS/3GPP, IPoE
- QoS - Layer 2: 802.1Q VLAN, SIP/RTP 802.1p
- QoS - Layer 3: ToS, DiffServ, MPLS
- Traffic Shaping: Supported
- SIP Server Failover: Automatic Failover to Secondary SIP Server
- FXS Expansion: Can Be Expanded by Peering with an FXS Gateway
Provisioning, Management & Security
- Provisioning: HTTP, HTTPS, SSH, TFTP, TR-069
- Automated Provisioning: Supported
- Configuration Files: XML Configuration Support
- Cloud Management: Grandstream Device Management System
- Management: Syslog, SSH, Web Browser
- Media Security: SRTP
- Control Security: TLS, SIPS, HTTPS
- AES Encryption: Supported
- Device Certificate: Unique Security Certificate per Unit
- UCM Zero Configuration: Supported with Compatible Grandstream UCM Series IP PBXs
Power & Physical
- Power Adapter Input: 100 to 240VAC, 50/60Hz
- Power Adapter Output: 12VDC, 1.5A
- Dimensions: 180 x 120 x 36 mm / 7.09 x 4.72 x 1.42 in.
- Weight: 356 g / 0.78 lb.
- Operating Temperature: 0°C to 50°C / 32°F to 123°F
- Storage Temperature: -10°C to 60°C / 14°F to 140°F
- Humidity: 10% to 90% Non-Condensing
- Compliance: FCC, CE, RCM
Compatibility & Buying Information
Eight FXS Ports: The HT818 V2 provides eight RJ11 FXS interfaces for connecting standard compatible analog telephones, fax machines, and other analog endpoint equipment to a SIP-based VoIP service or IP PBX.
FXS, Not FXO: The HT818 V2 provides analog station interfaces for endpoint devices. It is not an FXO gateway for connecting incoming analog PSTN telephone lines.
Two Gigabit Network Ports: NET1 and NET2 support 10/100/1000 Mbps Ethernet. By default, NET1 operates as a WAN connection using a DHCP client while NET2 operates as a LAN connection using a DHCP server, and the port roles can be changed through the web interface.
Integrated NAT Router: The built-in router allows the HT818 V2 to provide network routing in addition to analog-to-VoIP conversion, making it useful where voice endpoints and network connectivity need to be combined in a compact device.
SIP Service Required: The HT818 V2 converts compatible analog devices for use on SIP-based communications systems. A properly configured SIP account, hosted VoIP service, or compatible SIP IP PBX is required for calling functionality.
Grandstream UCM Integration: The HT818 V2 can be deployed with compatible Grandstream UCM series IP PBXs and supports Grandstream Zero Configuration provisioning for streamlined setup.
Fax Compatibility: The gateway supports T.38 Group 3 Fax Relay and automatic G.711 fax pass-through. Actual fax performance can depend on the connected fax equipment, SIP provider, PBX configuration, and network conditions.
GDMS Management: Grandstream Device Management System provides centralized provisioning, configuration, monitoring, firmware management, and troubleshooting for supported HT818 V2 deployments, making the device well suited for service providers and organizations managing multiple locations or large numbers of endpoints.
V2 Hardware Platform: When performing firmware updates or configuration maintenance, use resources specifically intended for the HT818 V2 and the current HT8xx V2 platform rather than firmware intended for the original HT818 hardware.
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