Dahdi show status

Hi,
when i use the “dahdi show status” command on CLI, it returns me some values, and one of them I didn’t understand.

The “bpviol” column. What it is? And what is it used for?

I noticed that this nunbem increases when I receive some calls in Dahdi.

Thanks

Probably “bi-polar violation” en.wikipedia.org/wiki/Bipolar_violation

Note these are sometimes deliberately introduced. en.wikipedia.org/wiki/Modified_AMI_code