The Grandstream HT813 is a versatile hybrid analog telephone adapter that combines 1 FXS and 1 FXO port, enabling seamless VoIP service while providing backup lifeline support through a PSTN line. This compact ATA allows users to easily convert analog technology to VoIP, delivering HD voice quality and advanced security features, including AES encryption and automated provisioning options. With support for 2 SIP profiles, reliable Fax-over-IP with T.38, and failover SIP server capabilities, the HT813 is perfect for both personal and business use, ensuring you stay connected even during power outages. Experience the benefits of modern communication with the reliable and efficient HT813 adapter.