We use MRTG and have no complaints.
This is how we have our pop Graphing/Monitoring setup. Polling time is 5 minutes.
 
Modems: http://mrtg.semo.net/semo-modems/arcadia-day.png
Router/PRI: http://mrtg.semo.net/routers/gate-arcadi.semo.net_serial0-day.png
TC Image: http://mrtg.semo.net/tc-images/Arcadia.png
 
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Adam Barnhill
Support Engineer, TotallyFabricated.com
Information Technology Engineer, Poplar Bluff Internet, Inc. / Semo.net
P.O. Box 190 | Poplar Bluff, MO 63902 | 573.686.9114, <http://www.semo.net/>
        Home of TotallyFabricated.com the creators of Total Scrutinizer
-----Original Message-----
From: usr-tc-bounces@mailman.xmission.com [mailto:usr-tc-bounces@mailman.xmission.com] On Behalf Of Noel Domine
Sent: Monday, April 07, 2003 11:16 AM
To: usr-tc@mailman.xmission.com
Subject: [USR-TC] Monitor Usage

I am trying to monitor and show it off to upper management of nice graphs and such of utilization, how many calls etc of the TC box.  Does anybody know of a good tool?

Thanks,
Noel