Frankly, that is not a question that someone in the process of installing a system should be asking.
If you install as a primary it will be an IP Office system with Voicemail Pro and one-X Portal and will require licenses to operate.
If you install as a secondary or expansion it will be to act as an additional IP Office in a network that already has a primary IP Office (and will need additional licenses on that primary).
If you install as an application server, then it runs Voicemail Pro and one-X Portal and can be used to provide those services to an existing IP500 V2, if the V2 has licenses for those services.
There are manuals for all of this.
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