yes this requires that you set the max capacity for the trunks in the setting you mention above
SO if you have 1 T1 on the gateway then the max capacity would be 23.
For MGCP we set it automatically but for the H323 and SIP you need to go to the UI and enter the
approrpriate values
Also make sure the call recors are showing in teh reports .
Go to Reports-> Interactive Reports - >Voice Call Quality reports -> CDR and make sure
the call data shows in the reports.
Before that You need to set the assurance server as a billing server in the CUCM publisher for the call records to be pushed
to the assurance server if you have not already done so.
thx
Prem