All the Multi-Port Model-G and Model-F devices (PSTN/Landline Devices) has Asyncron Input (Phone Line Side) ports. That means this port running seperataly and can be connected more than one phone lines (depending on device port count) to the devices.
Only Model-G1 is designed for single phone line systems.
Model-G has 1 and 2 port options, Model-F has 2 and 4 port options
Both the SIP and PSTN devices has Usb 2.0 (Hid) intarfeces to connect to PC. Not need driver software or extra setup for installation.
Up to 4 devices can be connected one pc at a time via different USB socket or over external usb-hub.