A swiss health insurance has some problems with their telephone system and keeps loosing calls. Nobody knows ther reason. The system logs a lot and it’s really hard to get information from there. There is a state of a call like initialized, queued, connected unordered and mix with other calls.

I’ve started to visualize the states with Graphviz, where we’ve found out that a call is divided in several sequences. This visualisation helped us a lot to better understand what was happening.

Therefore I’ve implemented a java application with the Play framework that collects the logs and identifies the complete calls with start and end time. The image above shows such a call with all its states. This made possible to finally see and examine all the incoming calls of the company.