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Small rectangular white VoIP gateway with five status LEDs and four ports on the front

Grandstream

Grandstream HT813 VoIP gateway 1 FXS 1 FXO 2 RJ-45

SKU CH-CY1D-3VKN6 MPN HT813

Connects one analogue phone and one PSTN line to VoIP with dual 100 Mbps ports and lifeline failover

  • TypeAccessories
  • ProtocolsTCP / IP / UDP, RTP / RTCP, HTTP / HTTPS, ARP / RARP, ICMP,
  • SecurityMedia: SRTP Control: TLS / SIPS / HTTPS Management: Syslog s
  • PortsTelephone Interfaces: 1 x RJ11 FXS port, One (1) RJ11 FXO PS
  • LEDsPOWER, LAN, WAN, FXS, FXO
  • PowerInput: 100-240V AC, 50-60Hz Output: 12V / 0.5A
  • Hybrid FXS and FXO ports enable PSTN backup calling
  • Dual 10/100 Mbps RJ45 ports with integrated NAT router
  • Lifeline support keeps FXS linked to FXO during power loss
  • 3-way voice conferencing on each port for group calls
  • Compact 1.14 x 5.14 x 3.56 inch design fits tight spaces

What it is and who it is for

The Grandstream HT813 is a compact VoIP gateway that connects one analogue telephone and one PSTN line to an IP network. It suits small offices or home users who want to keep existing handsets while moving calls onto a SIP trunk. Buyers needing more than one analogue extension or multiple PSTN lines should look elsewhere.

Port count and lifeline

The unit provides a single RJ11 FXS port for a telephone and one RJ11 FXO port for the PSTN line, with lifeline relay that hard-wires the FXS port to the FXO port during a power outage. This combination decides whether the gateway matches the line and handset count you have.

Installation and common issues

Two 10/100 Mbps RJ45 ports with a built-in NAT router let the device sit between the LAN and the WAN without extra hardware. Configuration is done through a web browser, telnet, SSH or TR-069 auto-provisioning. The most frequent problem is mismatched SIP credentials or firewall rules blocking the required signalling ports.

Highlights

  • Hybrid FXS and FXO ports enable PSTN backup calling
  • Dual 10/100 Mbps RJ45 ports with integrated NAT router
  • Lifeline support keeps FXS linked to FXO during power loss
  • 3-way voice conferencing on each port for group calls
  • Compact 1.14 x 5.14 x 3.56 inch design fits tight spaces

Specifications

BrandGrandstream
ModelHT813
TypeAccessories
ProtocolsTCP / IP / UDP, RTP / RTCP, HTTP / HTTPS, ARP / RARP, ICMP, DNS, DHCP, NTP,
TFTP, TELNET, STUN, SIP (RFC3261), SIP over TCP / TLS, SRTP, TR-069
SecurityMedia: SRTP
Control: TLS / SIPS / HTTPS
Management: Syslog support, telnet, SSH, remote management using web browser
PortsTelephone Interfaces: 1 x RJ11 FXS port, One (1) RJ11 FXO PSTN line port with lifeline support
Network Interface: 2 x 10/100 Mbps ports (RJ45) with integrated NAT router
LEDsPOWER, LAN, WAN, FXS, FXO
PowerInput: 100-240V AC, 50-60Hz
Output: 12V / 0.5A
Dimensions1.14" x 5.14" x 3.56"
Weight0.31 lb.
TemperatureOperating Temperature: 0 ~ 40 degree Celsius (32 ~ 104 degree Fahrenheit)
Storage Temperature: -10 ~ -60 degree Celsius (14 ~ 140 degree Fahrenheit)
Humidity10% to 90%, Non-Condensing
FeaturesSupports 2 SIP profiles through 1 FXS port and 1 FXO port
Dual 100 Mbps LAN and WAN ports
Lifeline support (FXS port will be hard-relayed to FXO port) in case of power outage
3-way voice conferencing per port
Automated & secure provisioning options using TR069
Supports T.38 Fax for reliable Fax-over-IP
Failover SIP server automatically switches to secondary server if main server loses connection
Strong AES encryption with security certificate per unit
Shipping weight0.91 kg
Package size305 × 229 × 110 mm

Questions about this item

What does the single FXS port actually let me connect?

It connects one analogue telephone or fax machine so it can place and receive calls over the VoIP service configured on the gateway.

The box lists two 10/100 Mbps RJ-45 ports — what does that cap at in practice?

Each port negotiates at 10 or 100 Mbps full-duplex, so the wired link to your router or switch will not exceed 100 Mbps throughput.

How much space does the 1.14 x 5.14 x 3.56 inch chassis need on a shelf or wall?

It occupies a footprint of roughly 5.14 by 3.56 inches and stands 1.14 inches tall, weighing 0.31 lb, so it fits on a narrow shelf or can be mounted with standard brackets.

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