Quintum makes a line of gateways specificaly for the Microsoft Response Point operating system. This 4-POTS-line gateway integrates easily with both the Syspine and the D-Link Response Point systems. Grow you Sypine system to 20 analog lines.
The 4 FXO ports each are connected to the telephone company line via a standard RJ11 jacks and to the internet via the Ethernet port.
Remember that the Syspine has an 8-line maximum configuration so never try to add more than 1 of these units to a 4-line system.