I have a potential customer that has a 3 year old Altigen system with a microsoft server running Altiware rel. 4.0. They have 10 Altitouch 390 phones and have 7 CO lines coming into the system. The model for the Altigen is IPC-6908 BP-250(i guess that's the model #). I know its tough to say, but does anyone have any idea what the value might be if I were to sell it?