Series of NPG Gateways
IAD is a kind of terminal device, with 10/100M Ethernet interface, and it could be connected with the common telephone directly through FXS port. It has the built-in Router/Switch.
There are three kinds of IAD products: Single line( NPG-201): connects one telephone only;Multiple lines: 2 (NPG-202), 4(NPG-204), 8(NPG-208), 16(NPG-216) lines, etc;With backup port: It has the connection port for common telephone lines, which can be connected to telephone lines. When making a call, the user can select to use the low rate IP communication telephone number or the the high rate original phone number. The user can answer all the calls through IP communication telephone or the original phone line. In addition, when there is Internet access failure, it will switch from IP communication line to the PSTN line automatically. Products Characteristics Available for T.38 protocol fax and confidential faxFlexible mode of billingQoS voice preferential guaranteeFlexible FXS/FXO interfacesFXS/FXO ports with lighting protection function.Easy installation, convenient maintainace and management Available for PPP/ PPPOE , DHCP Client.Available for static, dynamic and virtual IPAvailable for Internet and Intranet With Route function, available for concatenation . With small LAN exchange functionAvailable for remote update and maintainace, warm backup of Soft Switch platformPerfect voice quality , as good as PSTNAvailable for G.711,G.723.1,G.729A voice codecsEffective NAT penetrate function, adaptable for various net-connection modes. | 
