The Grandstream HT881 is an 8-port analog FXO gateway that bridges traditional PSTN (analog phone) lines with modern VoIP networks, allowing businesses to use existing analog lines with an IP PBX system. It features 8 FXO ports, 1 FXS port for failover, and supports 3 SIP profiles for flexible routing, automated provisioning, and strong security.Key Features and Specifications:Ports: 8 FXO ports (connect to analog lines) and 1 FXS port (for analog phone/fax, or to act as a "lifeline" during power outages).Networking: Two 10/100/1000 Mbps RJ45 ports (Gigabit) with integrated NAT router capabilities.VoIP Functionality: Supports 3 SIP profiles, allowing for connection to up to three different VoIP service providers or IP PBX systems.Voice Quality & Conferencing