One idea might be to use the perfmon too on the callmanager and put a watch on the number of active channels on a particular PRI span under the Call manager Gateway object (MGCP or H323 dependeing on your method of gateway). You could then go back through the logs on perfmon after saving them and look for the high point. There are doubtless better ways but this might be one option.
Ken Johnson
Mgr. Network Services
LeTourneau University
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CIPTUG
Cisco IP Telephony users Group
http://www.ciptug.org