Grandstream HT813 Adapter

Analog phone adapter that offers 1 FXS port for analog phone and 1 FXO port for PSTN line

Key features
  • Analog phone adapter 
  • 1 FXS port for tel. Analog and 1 FXO port for PSTN lines 
  • 2x 10 / 100Mbps (RJ45) ports with integrated router 
  • Dual LAN and WAN port  
  • Voice conference of 3 participants per port
£92.39 Incl. VAT
Delivery date with Express Shipping: 25/04/2024 If order placed before 12PM
2 years of manufacturer warranty Subject to manufacturer conditions
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Internal ref: GRAHT813UK
Manufacturer part #: HT813
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Product description

Grandstream HT813 Hybrid ATA with FXS and FXO ports

The Grandstream HT813 Adapter is an analog phone adapter that offers 1 FXS port for analog phone and 1 FXO port for PSTN line to provide backup in case of power outage using a PSTN line.The integration of an FXO and FXS port makes it possible for this hybrid ATA to allow remote calls with origin and destination on the PSTN line.

For greater flexibility, the FXS port extends the VoIP service to an analog device. Users can convert their analog technology to VoIP thanks to the ultra compact size, HD voice quality, advanced VoIP functionality, state-of-the-art security protection and multiple auto-provisioning options of the HT813. These advanced features also allow service providers to offer high quality IP service to customers seeking to upgrade to VoIP.


  • Allows 2 SIP profiles through 1 FXS port and 1 FXO port
  • 100 Mbps dual LAN and WAN port
  • Respaldp (the FXS port has a physical connection to the FXO port) in case of power interruption 
  • Voice conference of 3 participants per port 
  • Automated and secure provisioning options using TR069 
  • Compatible with T.38 Fax for a reliable process of sending and receiving faxes over an IP network 
  • Failover in case the SIP server automatically switches to the secondary server if the main server loses connection 
  • Strong AES encryption with security certificate per unit


Data sheet

Product Specs.

More Information
Manufacturer part #HT813
Warranty2 years

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