HT-822P is a low-priced gateway with two FXS ports and one PSTN live line port, developed by HyberTone Technology for foreign market. HT-822P can let users choose to use VoIP or the ordinary telephone line (PSTN) to call out. When the circuit is cut off, it will be switched to ordinary phone line automatically. This gateway can cooperate with the H.323of most domestic operators or does not need upgrade on SIP system. HT-822P offers two standard 24V FXS telephone interfaces to accord with such telecom standards as Europe, North America, China, etc. and can cooperate with various standard telephones, cordless telephone. This gateway has many advantages such as flexible configuration, smart appearance, multiple functions, and perfect tone quality. It is the first choice in converse safety, converse flexibility and market regularity