TalkSwitch 840vs 8 Line 4 Analog/IP  12 IP Extension Small Business Phone System Easy to set up Phone freedom. TalkSwitch works with any analog and IP phones. Remote extensions keep you connected anywhere Expandable Requirements for configuration software: Windows Vista (32 bit) or Windows XP or Windows 2000 and minimum 256MB RAM, 160MB hard disk space and 800x600 screen resolution.