How does iax2 show net stats work

asterisk -rx “iax2 show netstats” | grep x.x.x.

I have a bunch of packet loss and I am trying to figure it out its only happening for iax2 nothing else.

so how does the iax2 show netstat command work

why is kpkts zero across the board?
why is the % column all over 100%?

what are the numbers based on, the entire current call? or 1 minute averages or something?