• OS: Windows 95 – XP, Linux/Unix
• Browser: Internet Explorer 5 or higher, Netscape 6.2 or higher, Mozilla Firefox 1.0 or any web-browser supporting DOM and with enabled JavaScript.
• Spreadsheet processor (MS Excel)
• Display Settings:
• Minimum Screen Resolution : 1024 x 768
• Color Palette: 16 bit color (minimum)

A schematic diagram of VoIP infrastructure incorporating iTelBilling :