you will need the Power Conference Centre option for scheduling and reporting, though you should research your customers needs.
Not trying to bash the product here, as it does the basic job we paid for.
But is does lack some standard features which most other enterprise products have. Like the abiity to extend the time of an active conference, the ability to add more users to an active conference or the ability to terminate an active conference to free up resources. We've asked Avaya and they gave us no indication these features would be added, they just said we needed to buy their more advanced enterprise product.