The Grandstream HT813 is an analog telephone adapter with 1 FXS port for an analog phone and 1 FXO port for a PSTN line. It bridges your landline and VoIP service, with lifeline support that relays the phone to the PSTN line during a power outage.

Key Features of the Grandstream HT813

Supports 2 SIP profiles through 1 FXS port and 1 FXO port
Dual 100Mbps 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

Ideal For

Connecting a landline to VoIP
Home offices
Small businesses
Backup PSTN calling

Frequently Asked Questions

What is the FXO port used for?

The FXO port connects a PSTN landline, so the HT813 can bridge it to VoIP.

Does the HT813 work during a power cut?

Yes. Lifeline support hard-relays the FXS port to the FXO port during a power outage.

Buy the genuine Grandstream HT813 online at Telephonykart.

Grandstream HT813 Analog Telephone Adapter with FXS and FXO