When in SRST mode, the call detail records are not available from the Callmanager's prespective. The gateway does not buffer the call logs and send it to the Callmanager.
However the gateway does maintain the details of the calls in its MIB (Management Information Base) and you can access this either via SNMP or using the show commmands (show call history). Be advised that it keeps the data only for the last 100 calls.
Regards,
Anup