Concurrent Calls at any given time

Is there a way to tell the max concurrent calls for any given time for outgoing trunks (PRI’s). We currently have three PRI’s and I think we can get by with fewer but I am wanting to know what the max concurrent number has been. I am running Asterisk (Ver. and Freepbx 2.210.62-1.

Thanks, I will try that.

That site is a bit problematic today so some links:
Project wiki:

tarball download: