Once the software has been installed it will be registered and licensed in accordance wth the features you have purchased. Whilst the product variants define the core features you will be able to purchase additional licensable features as your organisation demands.
Licensable features include the following:
Number of concurrent users allowed to log onto the application
Extension packs - Expand the number of extensions you can use
Users and organisation allow you to control playback of calls enable advanced playback security
Reporting (Basic/Advanced) enable custom reporting, scheduling, distribution to email lists
Alarms, manage by exception, the system will inform you when there is a problem