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CapiDog is an ISDN monitor program that shows busy channels in the system tray.
Pops up a window showing the calling, called and redirecting numbers when a call comes in. Also allows a d-channel trace into a file.

Requires an AVM, Gerdes, or Scitel ISDN adapter due to the necessary CAPI 2.0 extensions.

CapiDog shows which bearer channels (B channels) are in use on an ISDN S0 line. A task bar symbol shows two colored squares, one for each channel. A popup window displays the numbers of incoming and outgoing calls. If CapiCall is installed on the same PC, even the names corresponding to these numbers are displayed if they are found in the CapiCall phone book. Connections can be logged with time, number and duration. For finding ISDN problems, a D channel trace can be written.

CapiDog requires an ISDN adapter with a special CAPI 2.0 extension. Adapters from AVM (driver release 3.08 and higher), Scitel (autumn 2000 or later) or Gerdes/Primux are suitable. CapiDog will not work after you start another application which monitors the D channel, like AVM IWatch.

An ISDN adapter only can "see" information coming from the public switch or PABX, so CapiDog is somewhat limited in what it can display.