Yes, you should be able to view service and enterprise parameters on CUCM 6.0. I'd suspect that you are hitting into CSCsh62086 which is resolved in the latest ES. Please open a TAC case to get the latest ES

1. You cannot restore your CM using SQL backup only. You would BARS backup to restore the system once CM has been re-installed on the box. Since the backup contains failes, database backup and registry backup as well, only using SQL would not work.2....

No, there is no such option available. Missed calls are only stored on the phone memory and cannot be accessed from the webpage

Yes, you can have to CallHandler for 2 different numbers. There is one more thing you can try. Instead of using a CTI Route Point, create a Translation Pattern where the Called Number is changed to Unity Pilot Point Number and the calling number is 1...