To find out which driver version you have if you have use the ISDN Monitor if it is pre 4.0. Checking the Diva Client driver version in Windows 2000/XP using ISDN Monitor Right-click on the Diva ISDN Monitor symbol on the task bar in the bottom right-hand corner of your screen. On the menu that appears, select 'ISDN Monitor'. The version number is displayed in the top-left of the ISDN Monitor pop-up Window: