Can anyone please inform if and where the CDR's are located on the UC520 / UC560 platforms
Just to add a little more to the great info from Walter (+5 points Walter!)
This link has some excellent info along with some config notes and a nice
Call Accounting & Reporting Software for CME and the UC500
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The CDR feature is not anable by default on IOS routers, is something that you have to configure; after that you could sabe the files in a FTP server, Syslog server or into the router's flash.
This link examplains how to configure this feature.
Cisco UCCX Specialist