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ISDN-MonitorScreenshot 

 

ISDN lines became generally accepted for two reasons as the standard for fixed line connections. First of all, you can use the telephone and internet at once. Secondly - and not insignificantly - it allows caller ID. This free application indicates who called and when on your computer. As soon as the telephone rings, the Freeware launches with details of the caller.

Screenshot of ISDN-Monitor