The HT813 is an analog telephone adapter that features 1 analog telephone FXS port and 1 PSTN line FXO port.

The Grandstream HT813 Analog Telephone Adapter features 1 analog telephone FXS port and 1 PSTN line FXO port in order to offer backup lifeline support using a PSTN line. The integration of an FXO and FXS port enables this hybrid ATA to support remote calling to and from the PSTN line. For added flexibility, the FXS port extends VoIP service to one analog device.

Grandstream HT813 Key Features
– 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

Grandstream HT813 Technical Specification
General:
– Telephone Interfaces: One (1) RJ11 FXS port, One (1) RJ11 FXO PSTN line port with lifeline support
– Network Interface: Two (2) 10/100Mbps ports (RJ45) with integrated NAT router
– LED Indicators: POWER, LAN, WAN, FXS, FXO
– Factory Reset Button Yes

– Voice Codecs: G.711 with Annex I (PLC) and Annex II (VAD/CNG), G.723.1, G.729A/B, G.726, iLBC, OPUS, dynamic jitter buffer, advanced line echo cancellation
– Fax over IP: T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax Pass-through