Tracking concurrent call load

I need to track the concurrent call load, hour by hour, and especially where and when it’s peaking.

Any suggestions? I’m open to doing some scripting, buying some software (as long as it’s not too pricey), or using a freeware product (my preference, naturally).

Should be able to get that over SNMP:

wiki.asterisk.org/wiki/display/ … 29+Support