Failed system call within ISDN
One of the ISDN protocol components attempted a system call but it failed. Details of the system call and error code returned are in the error log entry.
The system may continue without further problems, but if not, stop and restart the ISDN signalling process using the Custom Server Manager. If the problem persists, call Blueworx Support. When reporting ISDN software problems, take a copy of all files with names beginning es_ in the /var/tmp directory as soon as the error occurs.
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Log, System Monitor