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Entering hundreds of #'s individually would be very time consuming an difficult.  Does anybody have a method of uploading a list from an Excel file?

Thanks for the assistance.  Sorry I didn't respond sooner, have been out of office.  We will give this a try.  Thanks again.

In  the Screening, Greeting & HoldMusic section of the SuperAdmin extension (generally x101 unless it's been changed by you), go to the Blocked Calls section and select All Calls from the drop down. That will block ALL calls. Then enter the allowed numbers and/or area codes (if you want to allow an entire area code) you want to be able to call in. Everyone else will be blocked.

Make certain to do this on the SuperAdmin extension otherwise it will only work on the extension of the individual you select if not the SuperAdmin.