The ht-812p is designed as a compact, high performance, and low cost voip analog terminal adapter (fxs gateway). It comes with one fxs port to interface with a traditional analog phone set or a pbx trunk line for voip communications. By connecting a pstn line to the bypass port, the phone set connected to the fxs port can also access the pstn line for traditional telephone service. The ht-812p is a full featured fxs gateway and is designed for easy installation and configuration. It is an ideal low cost solution for travelers and soho users.