What does flaws in Freeswitch mean?

In recent works,I’d like to calculate lossrate.But I don’t konw what the flaws presentation.

It means anything outside perfection, its debounced so starting with missing on packet and getting worse as there are subsequent time periods with more missing packets.

Thanks for your reply.Actually I want to calculate the packet loss rate within a certain time interval,what should I do?Because I can’t find the way to calculate the number of the packet loss during the time interval,Thanks.