An alarm generation tool that operates within a Voice over IP (VoIP) network
environment
to generate alarms based on ISDN disconnect cause codes. The tool examines call-specific
usage records associated with VoIP traffic to detect ISDN disconnect cause codes
and determines failure rate information from failure-type disconnect cause codes
among the ISDN disconnect cause codes on a per-gateway basis. The tool generates
alarms when the failure rate information, such as failure rates and/or counts,
exceeds defined thresholds.