ISDN holding bay is full
One of the ISDN protocol components tried to write a message into the message holding bay, but it is full. A software problem in the ISDN protocol is the probable cause of this error.
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